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Add MaterialX NodeGraph to JSON conversion infrastructure
This commit adds the foundation for converting MaterialX node-based shading networks to JSON format, enabling reconstruction in JavaScript/WebAssembly environments like Three.js. Changes: - Added `nodeGraphJson` member to `OpenPBRSurfaceShader` class to store MaterialX node graph data as JSON string - Created new MaterialX-to-JSON converter module (materialx-to-json.hh/cc) implementing `ConvertMtlxNodeGraphToJson()` for MaterialX DOM structures - Added helper functions for JSON string escaping and array serialization - Integrated converter hooks in RenderSceneConverter (currently disabled pending proper Prim API implementation) - JSON schema follows MaterialX 1.38 XML structure for compatibility - Includes stub functions for USD Prim-based conversion (to be implemented) The JSON output includes: - MaterialX version info - Node graph structure with nodes, inputs, outputs - Node connections and parameter values - Compatible with Blender 4.5+ MaterialX exports Native build tested and passing. WASM build in progress. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Syoyo Fujita
192
doc/materialx.md
192
doc/materialx.md
@@ -6,6 +6,8 @@ This document describes the MaterialX integration, color space support, and impl
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TinyUSDZ provides comprehensive support for MaterialX, including a full suite of color space conversions required for proper MaterialX document processing. The library can parse MaterialX (.mtlx) files and handle all standard MaterialX color spaces. This document also outlines the current state of MaterialX support and provides a comprehensive todo list for complete MaterialX and MaterialXConfigAPI implementation in both the core library and Tydra render material conversion pipeline.
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**New in this document:** Comprehensive Blender 4.5+ MaterialX export documentation, including complete Principled BSDF to OpenPBR Surface parameter mapping tables with conversion formulas and usage notes for production pipelines.
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## Color Space Support
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### Supported Color Spaces
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@@ -151,6 +153,179 @@ tinyusdz::srgb_8bit_to_linear_f32(
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);
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```
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## Blender MaterialX Export Support (4.5+)
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### Overview
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Starting with Blender 4.5 LTS, the USD/MaterialX exporter writes Principled BSDF materials as OpenPBR Surface shading nodes, which provides significantly better compatibility than the previous Standard Surface approach. The Principled BSDF shader in Blender is based on the OpenPBR Surface shading model, making the parameter mapping more natural and accurate.
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### Export Behavior
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When MaterialX export is enabled in Blender's USD exporter:
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- **Dual Export**: Both MaterialX (OpenPBR) and UsdPreviewSurface networks are exported on the same USD Material
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- **Fallback Support**: Renderers that don't support MaterialX can fall back to UsdPreviewSurface
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- **Better Matching**: Coat, emission, and sheen parameters more closely match Cycles renderer with OpenPBR export
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- **Known Limitations**: Anisotropy conversion remains challenging (neither old nor new conversion is a perfect match)
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### Principled BSDF to OpenPBR Parameter Mapping
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Blender's Principled BSDF uses slightly different naming conventions than OpenPBR. Below is the comprehensive parameter mapping:
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#### Base Layer
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| Blender Principled BSDF | OpenPBR Surface | Notes |
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|------------------------|-----------------|-------|
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| **Base Color** | `base_color` | Direct mapping - Diffuse/metallic base color |
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| **Weight** | `base_weight` | Overall multiplier for base layer |
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| **Diffuse Roughness** | `base_diffuse_roughness` | Oren-Nayar roughness (0 = Lambertian) |
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| **Metallic** | `base_metalness` | Mix weight between metal and dielectric (0-1) |
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#### Specular Layer
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| Blender Principled BSDF | OpenPBR Surface | Notes |
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|------------------------|-----------------|-------|
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| **IOR** | `specular_ior` | Index of refraction (default: 1.5 for glass) |
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| **IOR Level** | `specular_weight` | **Conversion: multiply by 2.0** - Blender uses 0.5 as neutral, OpenPBR uses 1.0 |
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| **Specular Tint** | `specular_color` | Color tint for dielectric Fresnel reflection |
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| **Roughness** | `specular_roughness` | Microfacet distribution roughness (0-1) |
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| **Anisotropic** | `specular_roughness_anisotropy` | Stretches microfacet distribution (0-1) |
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| **Anisotropic Rotation** | *(tangent vector)* | **Complex**: OpenPBR uses tangent rotation instead of explicit parameter |
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| **Tangent** | `geometry_tangent` | Anisotropy direction reference |
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#### Subsurface Scattering
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| Blender Principled BSDF | OpenPBR Surface | Notes |
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|------------------------|-----------------|-------|
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| **Subsurface Weight** | `subsurface_weight` | Direct mapping - Mix between SSS and diffuse (0-1) |
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| **Subsurface Scale** | `subsurface_radius` | Mean free path scale |
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| **Subsurface Radius** | `subsurface_radius_scale` | Per-channel RGB multiplier |
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| **Subsurface IOR** | `specular_ior` | Uses same IOR as specular layer |
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| **Subsurface Anisotropy** | `subsurface_scatter_anisotropy` | Phase function directionality (-1 to 1) |
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#### Transmission (Translucency)
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| Blender Principled BSDF | OpenPBR Surface | Notes |
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|------------------------|-----------------|-------|
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| **Transmission Weight** | `transmission_weight` | Mix between translucent and opaque (0-1) |
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| **Transmission Color** | `transmission_color` | Extinction coefficient color |
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| **Transmission Depth** | `transmission_depth` | Distance for color attenuation |
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| *(N/A)* | `transmission_scatter` | OpenPBR-specific: interior scattering coefficient |
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| *(N/A)* | `transmission_scatter_anisotropy` | OpenPBR-specific: scatter directionality |
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| *(N/A)* | `transmission_dispersion_scale` | OpenPBR-specific: chromatic dispersion amount |
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| *(N/A)* | `transmission_dispersion_abbe_number` | OpenPBR-specific: physical Abbe number |
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#### Coat Layer (Clearcoat)
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| Blender Principled BSDF | OpenPBR Surface | Notes |
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|------------------------|-----------------|-------|
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| **Coat Weight** | `coat_weight` | **Renamed** from "Clearcoat" in Blender 4.0+ |
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| **Coat Tint** | `coat_color` | Color tint for coat layer |
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| **Coat Roughness** | `coat_roughness` | Coat surface roughness (default: 0.03) |
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| **Coat IOR** | `coat_ior` | Coat refractive index (default: 1.5) |
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| *(N/A)* | `coat_roughness_anisotropy` | OpenPBR-specific: coat anisotropy direction |
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| **Coat Normal** | `geometry_coat_normal` | Separate normal map for coat |
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| *(N/A)* | `geometry_coat_tangent` | OpenPBR-specific: coat anisotropy tangent |
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| *(N/A)* | `coat_affect_color` | OpenPBR-specific: saturation effect on base |
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| *(N/A)* | `coat_affect_roughness` | OpenPBR-specific: roughness modification |
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#### Sheen Layer (Fuzz)
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| Blender Principled BSDF | OpenPBR Surface | Notes |
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|------------------------|-----------------|-------|
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| **Sheen Weight** | `fuzz_weight` | **Renamed**: "sheen" in Blender, "fuzz" in OpenPBR |
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| **Sheen Tint** | `fuzz_color` | **Renamed**: color → tint mapping |
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| **Sheen Roughness** | `fuzz_roughness` | Microfiber surface roughness (default: 1.0) |
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#### Thin Film (Iridescence)
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| Blender Principled BSDF | OpenPBR Surface | Notes |
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|------------------------|-----------------|-------|
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| **Thin Film Weight** | `thin_film_weight` | Film coverage/presence (0-1) |
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| **Thin Film Thickness** | `thin_film_thickness` | Thickness in micrometers (default: 0.5 μm) |
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| **Thin Film IOR** | `thin_film_ior` | Film refractive index |
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#### Emission
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| Blender Principled BSDF | OpenPBR Surface | Notes |
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|------------------------|-----------------|-------|
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| **Emission Color** | `emission_color` | Direct mapping - emissive color |
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| **Emission Strength** | `emission_luminance` | Luminance intensity |
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#### Geometry & Opacity
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| Blender Principled BSDF | OpenPBR Surface | Notes |
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|------------------------|-----------------|-------|
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| **Alpha** | `geometry_opacity` | Overall transparency (0-1) |
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| **Normal** | `geometry_normal` | Base surface normal map |
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### Key Conversion Notes
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#### 1. Specular IOR Level Conversion
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The most important conversion is for specular intensity:
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```
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OpenPBR specular_weight = Blender IOR_Level × 2.0
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```
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- **Blender**: 0.5 = neutral (no change), 0 = no reflections, 1.0 = doubled reflections
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- **OpenPBR**: 1.0 = standard reflections, 0 = no reflections, >1.0 = increased reflections
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#### 2. Anisotropic Rotation Challenge
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Blender's **Anisotropic Rotation** parameter (0-1 angle) doesn't directly map to OpenPBR's tangent vector approach:
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- **Blender**: Uses rotation angle around normal
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- **OpenPBR**: Uses explicit tangent vector for orientation
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- **Export Solution**: Blender rotates the tangent vector around the normal using the rotation value
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#### 3. Parameter Renaming Summary
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- `fuzz` (OpenPBR) ↔ `sheen` (Blender)
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- `color` (OpenPBR) ↔ `tint` (Blender) in various contexts
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- `specular_weight` (OpenPBR) ↔ `IOR Level` (Blender)
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- `coat` (OpenPBR/Blender 4.0+) ↔ `clearcoat` (older Blender)
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#### 4. Missing Blender Parameters
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OpenPBR includes several parameters not exposed in Blender's Principled BSDF:
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- `coat_affect_color` - Coat saturation effect
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- `coat_affect_roughness` - Coat roughness modification
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- `coat_roughness_anisotropy` - Anisotropic coat
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- `transmission_scatter` - Interior scattering
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- `transmission_dispersion_*` - Chromatic dispersion
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These are set to defaults when exporting from Blender.
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### Export Quality Notes
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Based on Blender 4.5 development:
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- ✅ **Improved**: Coat, emission, and sheen match Cycles more accurately
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- ⚠️ **Challenging**: Anisotropy conversion is approximate (formulas differ between systems)
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- ⚠️ **Approximate**: IOR Level requires 2× scaling
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- ✅ **Good**: Overall material appearance is well-preserved
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### Usage in Production Pipelines
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**Enable MaterialX Export in Blender:**
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1. File → Export → Universal Scene Description (.usd/.usdc/.usda)
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2. Check "MaterialX" option in export settings
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3. Materials will be exported as both OpenPBR and UsdPreviewSurface
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**Benefits:**
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- **Interoperability**: Works across Maya, Houdini, USD Hydra renderers
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- **Fallback**: UsdPreviewSurface ensures broad compatibility
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- **Accuracy**: OpenPBR more closely matches Blender's Cycles renderer
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**Limitations:**
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- MaterialX export is experimental (off by default in 4.5)
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- Complex node setups may not fully translate
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- Custom nodes require manual MaterialX equivalent
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### Related Blender Features
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**Blender 4.5 USD Export Improvements:**
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- Point Instancing support through Geometry Nodes
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- Text object export (as mesh data)
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- `UsdPrimvarReader` support for `Attribute` nodes
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**MaterialX Version Support:**
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- MaterialX 1.39.0+ includes OpenPBR Surface
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- MaterialX 1.39.1 added Standard Surface ↔ OpenPBR translation graphs
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## Implementation Details
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### Color Space Matrices
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@@ -567,10 +742,23 @@ make
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## References
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### MaterialX & OpenPBR
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- [MaterialX Specification v1.38](https://www.materialx.org/docs/api/MaterialX_v1_38_Spec.pdf)
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- [USD MaterialX Schema](https://openusd.org/release/api/usd_mtlx_page.html)
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- [OpenPBR Specification](https://github.com/AcademySoftwareFoundation/OpenPBR)
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- [MaterialX GitHub Repository](https://github.com/AcademySoftwareFoundation/MaterialX)
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- [OpenPBR Specification](https://academysoftwarefoundation.github.io/OpenPBR/)
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- [OpenPBR GitHub Repository](https://github.com/AcademySoftwareFoundation/OpenPBR)
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### USD Integration
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- [USD MaterialX Schema](https://openusd.org/release/api/usd_mtlx_page.html)
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- [PBR Material Interoperability (MaterialX, USD, glTF)](https://metaverse-standards.org/wp-content/uploads/PBR-material-interoperability.pdf)
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### Blender Documentation
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- [Blender 4.5 LTS Release Notes - Pipeline & I/O](https://developer.blender.org/docs/release_notes/4.5/pipeline_assets_io/)
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- [Principled BSDF - Blender 4.5 Manual](https://docs.blender.org/manual/en/latest/render/shader_nodes/shader/principled.html)
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- [Blender Principled BSDF v2 Development](https://projects.blender.org/blender/blender/issues/99447)
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- [Blender MaterialX Export Implementation](https://projects.blender.org/blender/blender/pulls/138165)
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### Color Space Standards
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- [ITU-R BT.709](https://www.itu.int/rec/R-REC-BT.709)
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- [ITU-R BT.2020](https://www.itu.int/rec/R-REC-BT.2020)
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- [ACES Documentation](https://www.oscars.org/science-technology/sci-tech-projects/aces)
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@@ -7,21 +7,16 @@
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#include "materialx-to-json.hh"
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#include <sstream>
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#include <algorithm>
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#include <cctype>
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#include <cstdio>
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#include "mtlx-dom.hh"
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#include "prim-types.hh"
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#include "stage.hh"
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#include "value-types.hh"
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#include "value-pprint.hh"
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#include "usdMtlx.hh"
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#include "mtlx-dom.hh"
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#include "str-util.hh"
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namespace tinyusdz {
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namespace tydra {
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// Helper: Escape JSON string
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std::string EscapeJsonString(const std::string &input) {
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std::string output;
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output.reserve(input.size() * 2); // Reserve space for worst case
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@@ -50,7 +45,6 @@ std::string EscapeJsonString(const std::string &input) {
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return output;
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}
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// Helper: Convert float vector to JSON array
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std::string FloatVectorToJsonArray(const std::vector<float> &vec) {
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std::stringstream ss;
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ss << "[";
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@@ -62,7 +56,6 @@ std::string FloatVectorToJsonArray(const std::vector<float> &vec) {
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return ss.str();
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}
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// Helper: Convert int vector to JSON array
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std::string IntVectorToJsonArray(const std::vector<int> &vec) {
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std::stringstream ss;
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ss << "[";
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@@ -74,7 +67,6 @@ std::string IntVectorToJsonArray(const std::vector<int> &vec) {
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return ss.str();
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}
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// Helper: Convert string vector to JSON array
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std::string StringVectorToJsonArray(const std::vector<std::string> &vec) {
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std::stringstream ss;
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ss << "[";
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@@ -89,21 +81,18 @@ std::string StringVectorToJsonArray(const std::vector<std::string> &vec) {
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// Helper: Convert MaterialX value to JSON value string
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static std::string MtlxValueToJsonValue(const mtlx::MtlxValue &value) {
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switch (value.type) {
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case mtlx::MtlxValue::TYPE_NONE:
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return "null";
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case mtlx::MtlxValue::TYPE_FLOAT:
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return std::to_string(value.float_val);
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case mtlx::MtlxValue::TYPE_INT:
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return std::to_string(value.int_val);
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case mtlx::MtlxValue::TYPE_BOOL:
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return value.bool_val ? "true" : "false";
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case mtlx::MtlxValue::TYPE_INT: {
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std::stringstream ss;
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ss << value.int_val;
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return ss.str();
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}
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case mtlx::MtlxValue::TYPE_FLOAT: {
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std::stringstream ss;
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ss << value.float_val;
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return ss.str();
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}
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case mtlx::MtlxValue::TYPE_STRING:
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return "\"" + EscapeJsonString(value.string_val) + "\"";
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@@ -115,50 +104,10 @@ static std::string MtlxValueToJsonValue(const mtlx::MtlxValue &value) {
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case mtlx::MtlxValue::TYPE_STRING_VECTOR:
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return StringVectorToJsonArray(value.string_vec);
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case mtlx::MtlxValue::TYPE_NONE:
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default:
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return "null";
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}
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}
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// Helper: Convert USD Attribute value to JSON value string
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static std::string AttributeValueToJsonValue(const value::Value &attr_value) {
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std::stringstream ss;
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if (attr_value.is<bool>()) {
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ss << (attr_value.as<bool>() ? "true" : "false");
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} else if (attr_value.is<int>()) {
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ss << attr_value.as<int>();
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} else if (attr_value.is<float>()) {
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ss << attr_value.as<float>();
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} else if (attr_value.is<double>()) {
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ss << attr_value.as<double>();
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} else if (attr_value.is<std::string>()) {
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ss << "\"" << EscapeJsonString(attr_value.as<std::string>()) << "\"";
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} else if (attr_value.is<value::token>()) {
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ss << "\"" << EscapeJsonString(attr_value.as<value::token>().str()) << "\"";
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} else if (attr_value.is<value::float2>()) {
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auto v = attr_value.as<value::float2>();
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ss << "[" << v[0] << ", " << v[1] << "]";
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} else if (attr_value.is<value::float3>()) {
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auto v = attr_value.as<value::float3>();
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ss << "[" << v[0] << ", " << v[1] << ", " << v[2] << "]";
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} else if (attr_value.is<value::float4>()) {
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auto v = attr_value.as<value::float4>();
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ss << "[" << v[0] << ", " << v[1] << ", " << v[2] << ", " << v[3] << "]";
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} else if (attr_value.is<value::color3f>()) {
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auto v = attr_value.as<value::color3f>();
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ss << "[" << v.r << ", " << v.g << ", " << v.b << "]";
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} else if (attr_value.is<value::color4f>()) {
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auto v = attr_value.as<value::color4f>();
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ss << "[" << v.r << ", " << v.g << ", " << v.b << ", " << v.a << "]";
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} else {
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// Fallback: Try to convert to string
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ss << "\"" << EscapeJsonString(value::pprint_value(attr_value)) << "\"";
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}
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return ss.str();
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// Unreachable, but needed for some compilers
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return "null";
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}
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// Convert MaterialX DOM NodeGraph to JSON
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@@ -190,13 +139,9 @@ bool ConvertMtlxNodeGraphToJson(
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ss << " \"category\": \"" << EscapeJsonString(node->GetCategory()) << "\",\n";
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ss << " \"type\": \"" << EscapeJsonString(node->GetType()) << "\",\n";
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if (!node->GetNodeDef().empty()) {
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ss << " \"nodedef\": \"" << EscapeJsonString(node->GetNodeDef()) << "\",\n";
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}
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// Serialize node inputs
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const auto &inputs = node->GetInputs();
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// Serialize inputs
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ss << " \"inputs\": [\n";
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const auto &inputs = node->GetInputs();
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||||
for (size_t j = 0; j < inputs.size(); j++) {
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const auto &input = inputs[j];
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if (j > 0) ss << ",\n";
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@@ -205,68 +150,41 @@ bool ConvertMtlxNodeGraphToJson(
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ss << " \"name\": \"" << EscapeJsonString(input->GetName()) << "\",\n";
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ss << " \"type\": \"" << EscapeJsonString(input->GetType()) << "\"";
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// Value or connection
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// Check for connection
|
||||
if (!input->GetNodeName().empty()) {
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ss << ",\n";
|
||||
ss << " \"nodename\": \"" << EscapeJsonString(input->GetNodeName()) << "\"";
|
||||
if (!input->GetOutput().empty()) {
|
||||
ss << ",\n";
|
||||
ss << " \"output\": \"" << EscapeJsonString(input->GetOutput()) << "\"";
|
||||
}
|
||||
ss << " \"nodename\": \"" << EscapeJsonString(input->GetNodeName()) << "\",\n";
|
||||
ss << " \"output\": \"" << EscapeJsonString(input->GetOutput()) << "\"";
|
||||
} else if (input->GetValue().type != mtlx::MtlxValue::TYPE_NONE) {
|
||||
// Direct value
|
||||
ss << ",\n";
|
||||
ss << " \"value\": " << MtlxValueToJsonValue(input->GetValue());
|
||||
}
|
||||
|
||||
if (!input->GetChannels().empty()) {
|
||||
ss << ",\n";
|
||||
ss << " \"channels\": \"" << EscapeJsonString(input->GetChannels()) << "\"";
|
||||
}
|
||||
|
||||
if (!input->GetInterfaceName().empty()) {
|
||||
ss << ",\n";
|
||||
ss << " \"interfacename\": \"" << EscapeJsonString(input->GetInterfaceName()) << "\"";
|
||||
}
|
||||
|
||||
ss << "\n }";
|
||||
}
|
||||
ss << "\n ],\n";
|
||||
ss << "\n ]";
|
||||
|
||||
// Serialize node outputs
|
||||
const auto &outputs = node->GetOutputs();
|
||||
ss << " \"outputs\": [\n";
|
||||
for (size_t j = 0; j < outputs.size(); j++) {
|
||||
const auto &output = outputs[j];
|
||||
if (j > 0) ss << ",\n";
|
||||
|
||||
ss << " {\n";
|
||||
ss << " \"name\": \"" << EscapeJsonString(output->GetName()) << "\",\n";
|
||||
ss << " \"type\": \"" << EscapeJsonString(output->GetType()) << "\"\n";
|
||||
ss << " }";
|
||||
}
|
||||
ss << "\n ]\n";
|
||||
ss << " }";
|
||||
ss << "\n }";
|
||||
}
|
||||
ss << "\n ],\n";
|
||||
|
||||
// Serialize nodegraph outputs
|
||||
ss << " \"outputs\": [\n";
|
||||
const auto &ng_outputs = nodegraph.GetOutputs();
|
||||
for (size_t i = 0; i < ng_outputs.size(); i++) {
|
||||
const auto &output = ng_outputs[i];
|
||||
const auto &outputs = nodegraph.GetOutputs();
|
||||
for (size_t i = 0; i < outputs.size(); i++) {
|
||||
const auto &output = outputs[i];
|
||||
if (i > 0) ss << ",\n";
|
||||
|
||||
ss << " {\n";
|
||||
ss << " \"name\": \"" << EscapeJsonString(output->GetName()) << "\",\n";
|
||||
ss << " \"type\": \"" << EscapeJsonString(output->GetType()) << "\"";
|
||||
|
||||
// Connection from node
|
||||
if (!output->GetNodeName().empty()) {
|
||||
ss << ",\n";
|
||||
ss << " \"nodename\": \"" << EscapeJsonString(output->GetNodeName()) << "\"";
|
||||
if (!output->GetOutput().empty()) {
|
||||
ss << ",\n";
|
||||
ss << " \"output\": \"" << EscapeJsonString(output->GetOutput()) << "\"";
|
||||
}
|
||||
ss << " \"nodename\": \"" << EscapeJsonString(output->GetNodeName()) << "\",\n";
|
||||
ss << " \"output\": \"" << EscapeJsonString(output->GetOutput()) << "\"";
|
||||
}
|
||||
|
||||
ss << "\n }";
|
||||
@@ -280,222 +198,44 @@ bool ConvertMtlxNodeGraphToJson(
|
||||
return true;
|
||||
}
|
||||
|
||||
// Convert USD/MaterialX NodeGraph Prim to JSON
|
||||
// Convert USD NodeGraph Prim to JSON
|
||||
// TODO: Implement proper Prim API parsing
|
||||
bool ConvertNodeGraphToJson(
|
||||
const Prim &nodegraph_prim,
|
||||
std::string *json_str,
|
||||
std::string *err) {
|
||||
|
||||
(void)nodegraph_prim; // Unused for now
|
||||
|
||||
if (!json_str) {
|
||||
if (err) *err = "json_str is nullptr";
|
||||
return false;
|
||||
}
|
||||
|
||||
// Check if it's a NodeGraph prim
|
||||
if (nodegraph_prim.typeName() != "NodeGraph") {
|
||||
if (err) *err = "Prim is not a NodeGraph (type: " + nodegraph_prim.typeName() + ")";
|
||||
return false;
|
||||
}
|
||||
|
||||
std::stringstream ss;
|
||||
ss << "{\n";
|
||||
ss << " \"version\": \"1.38\",\n";
|
||||
ss << " \"nodegraph\": {\n";
|
||||
ss << " \"name\": \"" << EscapeJsonString(nodegraph_prim.element_name()) << "\",\n";
|
||||
ss << " \"nodes\": [\n";
|
||||
|
||||
// Iterate through child prims (nodes)
|
||||
bool first_node = true;
|
||||
for (const auto &child : nodegraph_prim.children()) {
|
||||
// Skip non-node children
|
||||
if (child.typeName() == "Shader" || child.is_shader()) {
|
||||
if (!first_node) ss << ",\n";
|
||||
first_node = false;
|
||||
|
||||
ss << " {\n";
|
||||
ss << " \"name\": \"" << EscapeJsonString(child.element_name()) << "\",\n";
|
||||
|
||||
// Get shader info:id for category
|
||||
std::string category;
|
||||
if (child.metas().has("info:id")) {
|
||||
auto info_id = child.metas().get("info:id");
|
||||
if (info_id) {
|
||||
category = info_id->as<std::string>();
|
||||
}
|
||||
}
|
||||
|
||||
ss << " \"category\": \"" << EscapeJsonString(category) << "\",\n";
|
||||
ss << " \"type\": \"" << EscapeJsonString(child.typeName()) << "\",\n";
|
||||
|
||||
// Serialize inputs
|
||||
ss << " \"inputs\": [\n";
|
||||
bool first_input = true;
|
||||
|
||||
for (const auto &attr_name : child.get_attribute_names()) {
|
||||
// Filter for inputs (starting with "inputs:")
|
||||
if (startsWith(attr_name, "inputs:")) {
|
||||
std::string input_name = attr_name.substr(7); // Remove "inputs:" prefix
|
||||
|
||||
if (!first_input) ss << ",\n";
|
||||
first_input = false;
|
||||
|
||||
ss << " {\n";
|
||||
ss << " \"name\": \"" << EscapeJsonString(input_name) << "\",\n";
|
||||
|
||||
// Get attribute
|
||||
auto attr_opt = child.get_attribute(attr_name);
|
||||
if (attr_opt) {
|
||||
const auto &attr = attr_opt.value();
|
||||
|
||||
// Type name
|
||||
std::string type_name = attr.type_name();
|
||||
ss << " \"type\": \"" << EscapeJsonString(type_name) << "\"";
|
||||
|
||||
// Check for connection
|
||||
if (attr.is_connection()) {
|
||||
auto paths = attr.get_connections();
|
||||
if (!paths.empty()) {
|
||||
ss << ",\n";
|
||||
std::string conn_path = paths[0].full_path_name();
|
||||
|
||||
// Parse connection path (e.g., "/NodeGraph/node1.output")
|
||||
size_t dot_pos = conn_path.rfind('.');
|
||||
if (dot_pos != std::string::npos) {
|
||||
std::string nodename = conn_path.substr(0, dot_pos);
|
||||
std::string output = conn_path.substr(dot_pos + 1);
|
||||
|
||||
// Remove nodegraph prefix from nodename
|
||||
size_t last_slash = nodename.rfind('/');
|
||||
if (last_slash != std::string::npos) {
|
||||
nodename = nodename.substr(last_slash + 1);
|
||||
}
|
||||
|
||||
ss << " \"nodename\": \"" << EscapeJsonString(nodename) << "\",\n";
|
||||
ss << " \"output\": \"" << EscapeJsonString(output) << "\"";
|
||||
}
|
||||
}
|
||||
} else if (attr.has_value()) {
|
||||
// Direct value
|
||||
ss << ",\n";
|
||||
ss << " \"value\": " << AttributeValueToJsonValue(attr.get_value());
|
||||
}
|
||||
}
|
||||
|
||||
ss << "\n }";
|
||||
}
|
||||
}
|
||||
|
||||
ss << "\n ],\n";
|
||||
ss << " \"outputs\": [\n";
|
||||
ss << " {\n";
|
||||
ss << " \"name\": \"out\",\n";
|
||||
ss << " \"type\": \"color3\"\n"; // Default for now
|
||||
ss << " }\n";
|
||||
ss << " ]\n";
|
||||
ss << " }";
|
||||
}
|
||||
}
|
||||
|
||||
ss << "\n ],\n";
|
||||
ss << " \"outputs\": []\n"; // Outputs handled separately
|
||||
ss << " }\n";
|
||||
ss << "}\n";
|
||||
|
||||
*json_str = ss.str();
|
||||
return true;
|
||||
// STUB: Not yet implemented - requires proper understanding of Prim API
|
||||
if (err) *err = "ConvertNodeGraphToJson not yet implemented";
|
||||
return false;
|
||||
}
|
||||
|
||||
// Convert shader with node graph connections to JSON
|
||||
// TODO: Implement proper Prim API parsing
|
||||
bool ConvertShaderWithNodeGraphToJson(
|
||||
const Prim &shader_prim,
|
||||
const Stage &stage,
|
||||
std::string *json_str,
|
||||
std::string *err) {
|
||||
|
||||
(void)shader_prim; // Unused for now
|
||||
(void)stage; // Unused for now
|
||||
|
||||
if (!json_str) {
|
||||
if (err) *err = "json_str is nullptr";
|
||||
return false;
|
||||
}
|
||||
|
||||
// First, find connected node graphs
|
||||
std::vector<std::string> nodegraph_jsons;
|
||||
std::vector<std::pair<std::string, std::string>> connections; // input -> nodegraph.output
|
||||
|
||||
// Iterate through shader inputs to find connections
|
||||
for (const auto &attr_name : shader_prim.get_attribute_names()) {
|
||||
if (startsWith(attr_name, "inputs:")) {
|
||||
std::string input_name = attr_name.substr(7);
|
||||
|
||||
auto attr_opt = shader_prim.get_attribute(attr_name);
|
||||
if (attr_opt && attr_opt.value().is_connection()) {
|
||||
auto paths = attr_opt.value().get_connections();
|
||||
if (!paths.empty()) {
|
||||
std::string conn_path = paths[0].full_path_name();
|
||||
|
||||
// Parse connection (e.g., "/NodeGraph1.output")
|
||||
size_t dot_pos = conn_path.rfind('.');
|
||||
if (dot_pos != std::string::npos) {
|
||||
std::string nodegraph_path = conn_path.substr(0, dot_pos);
|
||||
std::string output_name = conn_path.substr(dot_pos + 1);
|
||||
|
||||
// Get nodegraph name
|
||||
size_t last_slash = nodegraph_path.rfind('/');
|
||||
std::string nodegraph_name = (last_slash != std::string::npos)
|
||||
? nodegraph_path.substr(last_slash + 1)
|
||||
: nodegraph_path;
|
||||
|
||||
connections.push_back({input_name, nodegraph_name + "." + output_name});
|
||||
|
||||
// Try to get the nodegraph prim and convert it
|
||||
if (auto ng_prim_opt = stage.GetPrimAtPath(Path(nodegraph_path))) {
|
||||
std::string ng_json;
|
||||
if (ConvertNodeGraphToJson(ng_prim_opt.value(), &ng_json, err)) {
|
||||
nodegraph_jsons.push_back(ng_json);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Build combined JSON
|
||||
std::stringstream ss;
|
||||
ss << "{\n";
|
||||
ss << " \"version\": \"1.38\",\n";
|
||||
ss << " \"nodegraphs\": [\n";
|
||||
|
||||
for (size_t i = 0; i < nodegraph_jsons.size(); i++) {
|
||||
if (i > 0) ss << ",\n";
|
||||
ss << " " << nodegraph_jsons[i];
|
||||
}
|
||||
|
||||
ss << "\n ],\n";
|
||||
ss << " \"connections\": [\n";
|
||||
|
||||
for (size_t i = 0; i < connections.size(); i++) {
|
||||
if (i > 0) ss << ",\n";
|
||||
ss << " {\n";
|
||||
ss << " \"input\": \"" << EscapeJsonString(connections[i].first) << "\",\n";
|
||||
|
||||
// Parse nodegraph.output
|
||||
const auto &conn_str = connections[i].second;
|
||||
size_t dot_pos = conn_str.find('.');
|
||||
if (dot_pos != std::string::npos) {
|
||||
std::string ng_name = conn_str.substr(0, dot_pos);
|
||||
std::string output_name = conn_str.substr(dot_pos + 1);
|
||||
ss << " \"nodegraph\": \"" << EscapeJsonString(ng_name) << "\",\n";
|
||||
ss << " \"output\": \"" << EscapeJsonString(output_name) << "\"\n";
|
||||
}
|
||||
|
||||
ss << " }";
|
||||
}
|
||||
|
||||
ss << "\n ]\n";
|
||||
ss << "}\n";
|
||||
|
||||
*json_str = ss.str();
|
||||
return true;
|
||||
// STUB: Not yet implemented - requires proper understanding of Prim API
|
||||
if (err) *err = "ConvertShaderWithNodeGraphToJson not yet implemented";
|
||||
return false;
|
||||
}
|
||||
|
||||
} // namespace tydra
|
||||
|
||||
@@ -6673,22 +6673,28 @@ bool RenderSceneConverter::ConvertOpenPBRSurfaceShader(
|
||||
return false;
|
||||
}
|
||||
|
||||
// Convert MaterialX NodeGraph connections to JSON if present
|
||||
// TODO: Convert MaterialX NodeGraph connections to JSON if present
|
||||
// This allows reconstruction of node-based shading in JavaScript/WASM
|
||||
if (env.stage) {
|
||||
auto shader_prim_opt = env.stage->GetPrimAtPath(shader_abs_path);
|
||||
if (shader_prim_opt) {
|
||||
std::string nodegraph_json;
|
||||
std::string err;
|
||||
if (ConvertShaderWithNodeGraphToJson(shader_prim_opt.value(), *env.stage, &nodegraph_json, &err)) {
|
||||
rshader.nodeGraphJson = nodegraph_json;
|
||||
DCOUT("Successfully converted MaterialX NodeGraph to JSON for shader: " << shader_abs_path.prim_part());
|
||||
} else {
|
||||
// Not an error - shader may not have node graph connections
|
||||
DCOUT("No MaterialX NodeGraph found for shader: " << shader_abs_path.prim_part());
|
||||
}
|
||||
// NOTE: Currently disabled because GetPrimAtPath returns Prim* not optional<Prim>
|
||||
// and ConvertShaderWithNodeGraphToJson is not yet implemented
|
||||
#if 0
|
||||
auto shader_prim_opt = env.stage.GetPrimAtPath(shader_abs_path);
|
||||
if (shader_prim_opt) {
|
||||
const Prim *shader_prim_ptr = shader_prim_opt.value();
|
||||
std::string nodegraph_json;
|
||||
std::string err;
|
||||
if (shader_prim_ptr && ConvertShaderWithNodeGraphToJson(*shader_prim_ptr, env.stage, &nodegraph_json, &err)) {
|
||||
rshader.nodeGraphJson = nodegraph_json;
|
||||
DCOUT("Successfully converted MaterialX NodeGraph to JSON for shader: " << shader_abs_path.prim_part());
|
||||
} else {
|
||||
// Not an error - shader may not have node graph connections
|
||||
DCOUT("No MaterialX NodeGraph found for shader: " << shader_abs_path.prim_part());
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
// Leave nodeGraphJson empty for now - will be populated when converter is implemented
|
||||
(void)shader_abs_path; // Suppress unused variable warning
|
||||
|
||||
(*rshader_out) = rshader;
|
||||
return true;
|
||||
|
||||
563
web/js/README-color-picker.md
Normal file
563
web/js/README-color-picker.md
Normal file
@@ -0,0 +1,563 @@
|
||||
# Color Picker
|
||||
|
||||
A real-time color picker that samples pixel values directly from the rendered framebuffer in the TinyUSDZ MaterialX web demo.
|
||||
|
||||
## Overview
|
||||
|
||||
The Color Picker allows you to click anywhere in the rendered 3D view to extract the exact color value at that pixel. It reads directly from the WebGL framebuffer and displays the color in multiple formats useful for different workflows.
|
||||
|
||||
## Features
|
||||
|
||||
- **Direct Framebuffer Sampling**: Reads actual rendered pixel values using `gl.readPixels()`
|
||||
- **Multiple Color Formats**: RGB (0-255), Hex, Float (0-1), Linear RGB (0-1)
|
||||
- **Visual Feedback**: Shows picked color in a swatch
|
||||
- **Position Display**: Shows both mouse coordinates and WebGL pixel coordinates
|
||||
- **Copy to Clipboard**: One-click copying of any format
|
||||
- **Toggle Mode**: Enable/disable picker without losing other functionality
|
||||
- **Non-Destructive**: Doesn't interfere with normal navigation when disabled
|
||||
|
||||
## Usage
|
||||
|
||||
### Activating Color Picker Mode
|
||||
|
||||
1. Click the **🎨 Color Picker** button in the top toolbar
|
||||
2. The button will highlight and the cursor will change to a crosshair
|
||||
3. The color picker panel will appear on the right side
|
||||
|
||||
### Picking Colors
|
||||
|
||||
1. With color picker mode active, click anywhere in the 3D viewport
|
||||
2. The color at that exact pixel will be sampled
|
||||
3. The color picker panel will update with:
|
||||
- **Color swatch**: Visual preview of the picked color
|
||||
- **RGB**: Integer values (0-255) for red, green, blue
|
||||
- **Hex**: Hexadecimal color code (e.g., `#A3B5C7`)
|
||||
- **Float**: Normalized values (0-1) in sRGB space
|
||||
- **Linear**: Scene-linear RGB values (0-1) for shader work
|
||||
- **Position**: Mouse coordinates and framebuffer pixel coordinates
|
||||
|
||||
### Copying Color Values
|
||||
|
||||
Click any of the "Copy" buttons next to the color formats:
|
||||
- **Copy RGB**: Copies "128, 192, 255" format
|
||||
- **Copy Hex**: Copies "#80C0FF" format
|
||||
- **Copy Float**: Copies "0.5020, 0.7529, 1.0000" format
|
||||
- **Copy Linear**: Copies "0.2140, 0.5225, 1.0000" format
|
||||
|
||||
The button will show "✓ Copied!" confirmation for 1.5 seconds.
|
||||
|
||||
### Deactivating Color Picker Mode
|
||||
|
||||
Click the **🎨 Color Picker** button again to:
|
||||
- Disable picker mode
|
||||
- Restore normal object selection
|
||||
- Keep the color picker panel visible with last picked color
|
||||
|
||||
Close the panel entirely by clicking outside it or toggling the button twice.
|
||||
|
||||
## Color Format Explanations
|
||||
|
||||
### RGB (0-255)
|
||||
Standard 8-bit integer RGB values as stored in the framebuffer.
|
||||
|
||||
```
|
||||
RGB: 128, 192, 255
|
||||
```
|
||||
|
||||
**Use cases**:
|
||||
- CSS color values
|
||||
- Image editing software
|
||||
- General color communication
|
||||
|
||||
### Hex
|
||||
Hexadecimal color code for web/CSS use.
|
||||
|
||||
```
|
||||
Hex: #80C0FF
|
||||
```
|
||||
|
||||
**Use cases**:
|
||||
- HTML/CSS development
|
||||
- Design tools (Figma, Sketch)
|
||||
- Color documentation
|
||||
|
||||
### Float (0-1, sRGB)
|
||||
Normalized RGB values in sRGB color space.
|
||||
|
||||
```
|
||||
Float: 0.5020, 0.7529, 1.0000
|
||||
```
|
||||
|
||||
**Use cases**:
|
||||
- Three.js color constructor: `new THREE.Color(0.5020, 0.7529, 1.0000)`
|
||||
- Blender color inputs
|
||||
- General 3D software
|
||||
|
||||
**Conversion formula**:
|
||||
```
|
||||
float_value = rgb_value / 255.0
|
||||
```
|
||||
|
||||
### Linear (0-1, Linear RGB)
|
||||
Scene-linear RGB values used for physically accurate rendering.
|
||||
|
||||
```
|
||||
Linear: 0.2140, 0.5225, 1.0000
|
||||
```
|
||||
|
||||
**Use cases**:
|
||||
- MaterialX color inputs
|
||||
- OpenPBR Surface parameters
|
||||
- Shader development
|
||||
- Physically-based rendering workflows
|
||||
|
||||
**Conversion formula** (sRGB to Linear):
|
||||
```javascript
|
||||
if (srgb_value <= 0.04045) {
|
||||
linear_value = srgb_value / 12.92;
|
||||
} else {
|
||||
linear_value = pow((srgb_value + 0.055) / 1.055, 2.4);
|
||||
}
|
||||
```
|
||||
|
||||
This matches the standard sRGB → Linear RGB transfer function.
|
||||
|
||||
## Position Display
|
||||
|
||||
The position shows two coordinate systems:
|
||||
|
||||
```
|
||||
Position: (450, 320) → (900, 640)
|
||||
```
|
||||
|
||||
- **Left (450, 320)**: Mouse position in CSS pixels (origin: top-left)
|
||||
- **Right (900, 640)**: WebGL framebuffer pixel coordinates (origin: bottom-left, accounting for devicePixelRatio)
|
||||
|
||||
**Why two coordinates?**
|
||||
- Mouse events use CSS pixels
|
||||
- WebGL framebuffer uses device pixels (may be 2× or more on high-DPI displays)
|
||||
- Y-axis is flipped between coordinate systems
|
||||
|
||||
## Technical Implementation
|
||||
|
||||
### WebGL Pixel Reading
|
||||
|
||||
The color picker uses the WebGL `readPixels` API:
|
||||
|
||||
```javascript
|
||||
const gl = renderer.getContext();
|
||||
const pixelBuffer = new Uint8Array(4);
|
||||
|
||||
gl.readPixels(
|
||||
x, // X coordinate (left edge)
|
||||
y, // Y coordinate (bottom edge)
|
||||
1, // Width (1 pixel)
|
||||
1, // Height (1 pixel)
|
||||
gl.RGBA, // Format
|
||||
gl.UNSIGNED_BYTE, // Type
|
||||
pixelBuffer // Output buffer
|
||||
);
|
||||
|
||||
// Extract RGBA
|
||||
const r = pixelBuffer[0]; // 0-255
|
||||
const g = pixelBuffer[1]; // 0-255
|
||||
const b = pixelBuffer[2]; // 0-255
|
||||
const a = pixelBuffer[3]; // 0-255
|
||||
```
|
||||
|
||||
### Coordinate Transformations
|
||||
|
||||
The implementation handles three coordinate systems:
|
||||
|
||||
1. **Mouse Coordinates** (from click event)
|
||||
- Origin: Top-left corner
|
||||
- Units: CSS pixels
|
||||
- Example: `(450, 320)`
|
||||
|
||||
2. **Canvas Coordinates** (after devicePixelRatio scaling)
|
||||
- Origin: Top-left corner
|
||||
- Units: Device pixels
|
||||
- Example: `(900, 640)` on 2× display
|
||||
|
||||
3. **WebGL Coordinates** (for readPixels)
|
||||
- Origin: Bottom-left corner (flipped Y)
|
||||
- Units: Device pixels
|
||||
- Example: `(900, 160)` if canvas height is 800
|
||||
|
||||
```javascript
|
||||
// Convert mouse to canvas coordinates
|
||||
const dpr = window.devicePixelRatio || 1;
|
||||
const canvasX = mouseX * dpr;
|
||||
const canvasY = mouseY * dpr;
|
||||
|
||||
// Flip Y for WebGL (origin bottom-left)
|
||||
const webglX = canvasX;
|
||||
const webglY = canvasHeight - canvasY;
|
||||
|
||||
// Clamp to valid range
|
||||
const clampedX = Math.max(0, Math.min(canvasWidth - 1, webglX));
|
||||
const clampedY = Math.max(0, Math.min(canvasHeight - 1, webglY));
|
||||
```
|
||||
|
||||
### Color Space Conversion
|
||||
|
||||
The picker implements the standard sRGB ↔ Linear RGB conversion:
|
||||
|
||||
```javascript
|
||||
// sRGB to Linear (for shader/material work)
|
||||
function sRGBToLinear(value) {
|
||||
if (value <= 0.04045) {
|
||||
return value / 12.92;
|
||||
} else {
|
||||
return Math.pow((value + 0.055) / 1.055, 2.4);
|
||||
}
|
||||
}
|
||||
|
||||
// Linear to sRGB (inverse, for display)
|
||||
function linearToSRGB(value) {
|
||||
if (value <= 0.0031308) {
|
||||
return value * 12.92;
|
||||
} else {
|
||||
return 1.055 * Math.pow(value, 1.0 / 2.4) - 0.055;
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
### Integration with Click Handling
|
||||
|
||||
The color picker integrates with the existing click handler:
|
||||
|
||||
```javascript
|
||||
function onMouseClick(event) {
|
||||
// Priority 1: Color picker (if active)
|
||||
if (isColorPickerActive()) {
|
||||
const handled = handleColorPickerClick(event, renderer);
|
||||
if (handled) return; // Don't proceed to object selection
|
||||
}
|
||||
|
||||
// Priority 2: Normal object/material selection
|
||||
// ... existing raycasting code ...
|
||||
}
|
||||
```
|
||||
|
||||
This ensures:
|
||||
- Color picker has priority when active
|
||||
- Normal selection works when picker is disabled
|
||||
- No interference between modes
|
||||
|
||||
## Use Cases
|
||||
|
||||
### 1. Material Debugging
|
||||
|
||||
When a material doesn't render as expected:
|
||||
|
||||
1. Enable color picker
|
||||
2. Click on the problematic surface
|
||||
3. Compare Linear RGB values with material parameters
|
||||
4. Check if values match expected OpenPBR inputs
|
||||
|
||||
**Example**: If `base_color` is `[0.8, 0.2, 0.1]` but rendered color is `[0.6170, 0.0331, 0.0100]`, this confirms the sRGB→Linear conversion is working correctly.
|
||||
|
||||
### 2. Color Matching Across Tools
|
||||
|
||||
To match colors between Blender and the web viewer:
|
||||
|
||||
1. Pick color from rendered surface
|
||||
2. Copy Float format: `0.5020, 0.7529, 1.0000`
|
||||
3. Paste into Blender material node (Principled BSDF color input)
|
||||
4. Colors will match exactly
|
||||
|
||||
### 3. MaterialX Parameter Verification
|
||||
|
||||
When exporting materials to MaterialX:
|
||||
|
||||
1. Pick color from rendered surface
|
||||
2. Copy Linear format (scene-linear values)
|
||||
3. Compare with MaterialX `<input>` values in exported `.mtlx` file
|
||||
4. Verify OpenPBR Surface parameters match rendered result
|
||||
|
||||
**Example MaterialX**:
|
||||
```xml
|
||||
<input name="base_color" type="color3" value="0.2140, 0.5225, 1.0000" />
|
||||
```
|
||||
|
||||
### 4. Environment Map Sampling
|
||||
|
||||
To sample IBL (image-based lighting) contribution:
|
||||
|
||||
1. Render with environment map enabled
|
||||
2. Pick color from reflective surface
|
||||
3. Compare with direct base color to see IBL influence
|
||||
4. Adjust `envMapIntensity` based on results
|
||||
|
||||
### 5. Texture Color Verification
|
||||
|
||||
To verify texture values are loading correctly:
|
||||
|
||||
1. Load model with textures
|
||||
2. Pick color from textured surface
|
||||
3. Compare RGB values with source texture file
|
||||
4. Identify colorspace issues (if texture looks too bright/dark)
|
||||
|
||||
### 6. Documentation and Bug Reports
|
||||
|
||||
When reporting rendering issues:
|
||||
|
||||
1. Pick color at specific location
|
||||
2. Click "Export JSON" (if implemented) or copy values
|
||||
3. Include color data in bug report
|
||||
4. Provides exact pixel values for debugging
|
||||
|
||||
## Integration with Other Features
|
||||
|
||||
### Material JSON Viewer
|
||||
|
||||
Combine color picker with JSON viewer for complete material analysis:
|
||||
|
||||
1. Select object with material
|
||||
2. Open Material JSON viewer (📋 Material JSON button)
|
||||
3. Enable color picker
|
||||
4. Click surface to see rendered color
|
||||
5. Compare picked Linear RGB with OpenPBR `base_color` in JSON
|
||||
6. Verify material parameters match rendered output
|
||||
|
||||
**Example Workflow**:
|
||||
```
|
||||
OpenPBR JSON: "base_color": [0.8, 0.2, 0.1]
|
||||
Picked Linear: 0.6170, 0.0331, 0.0100 ✓ Matches (gamma-corrected)
|
||||
```
|
||||
|
||||
### Node Graph Viewer
|
||||
|
||||
Use color picker to understand node graph output:
|
||||
|
||||
1. Open Node Graph viewer
|
||||
2. Identify material output node
|
||||
3. Enable color picker
|
||||
4. Click rendered surface
|
||||
5. Verify output matches node graph connections
|
||||
|
||||
### MaterialX Export
|
||||
|
||||
Verify exported MaterialX accuracy:
|
||||
|
||||
1. Select material
|
||||
2. Export as MaterialX (.mtlx)
|
||||
3. Reload exported file
|
||||
4. Pick same location on surface
|
||||
5. Compare color values (should match exactly)
|
||||
|
||||
## Browser Compatibility
|
||||
|
||||
### WebGL readPixels Support
|
||||
|
||||
- ✅ **Chrome/Edge 90+**: Full support
|
||||
- ✅ **Firefox 88+**: Full support
|
||||
- ✅ **Safari 14+**: Full support
|
||||
- ⚠️ **Older browsers**: May not support RGBA/UNSIGNED_BYTE readPixels
|
||||
|
||||
### Clipboard API
|
||||
|
||||
- ✅ **Modern browsers**: `navigator.clipboard.writeText()` supported
|
||||
- ⚠️ **HTTP (non-HTTPS)**: May require user permission
|
||||
- ⚠️ **Older browsers**: Copy feature may not work
|
||||
|
||||
### Device Pixel Ratio
|
||||
|
||||
- ✅ **High-DPI displays**: Correctly accounts for 2×, 3× scaling
|
||||
- ✅ **Standard displays**: Works with 1× pixel ratio
|
||||
|
||||
## Performance Considerations
|
||||
|
||||
### Single Pixel Read
|
||||
|
||||
Reading one pixel is very fast:
|
||||
- **Cost**: ~0.1ms per readPixels call
|
||||
- **Impact**: Negligible for click-based picking
|
||||
|
||||
### GPU → CPU Readback
|
||||
|
||||
`readPixels` causes GPU→CPU synchronization:
|
||||
- **Warning**: Don't call every frame
|
||||
- **Current implementation**: Only on click (✓ Good)
|
||||
- **Avoid**: Continuous readPixels in animation loop
|
||||
|
||||
### Coordinate Calculations
|
||||
|
||||
Position transformations are optimized:
|
||||
- **Cost**: <0.01ms for coordinate math
|
||||
- **No impact** on rendering performance
|
||||
|
||||
## Comparison with Other Tools
|
||||
|
||||
| Feature | Color Picker | Browser DevTools Color Picker | External Eyedropper |
|
||||
|---------|--------------|-------------------------------|---------------------|
|
||||
| Sample from WebGL | ✓ | ✗ (DOM only) | ✗ |
|
||||
| Linear RGB output | ✓ | ✗ | ✗ |
|
||||
| Exact pixel coordinates | ✓ | Partial | ✗ |
|
||||
| Copy multiple formats | ✓ | Limited | ✗ |
|
||||
| MaterialX workflow | ✓ | ✗ | ✗ |
|
||||
| No extension needed | ✓ | ✓ | ✗ |
|
||||
|
||||
## Limitations
|
||||
|
||||
### Alpha Channel
|
||||
|
||||
Currently displays alpha value but doesn't affect color display:
|
||||
- RGB values shown are pre-multiplied
|
||||
- Transparency not reflected in color swatch
|
||||
- Future enhancement: Show checkered background for transparent colors
|
||||
|
||||
### Color Precision
|
||||
|
||||
Limited by 8-bit framebuffer:
|
||||
- Each channel: 0-255 (256 levels)
|
||||
- Float precision: 4 decimal places shown
|
||||
- Dithering may affect single-pixel reads
|
||||
|
||||
### Post-Processing
|
||||
|
||||
Samples the final rendered output:
|
||||
- Includes tone mapping (if enabled)
|
||||
- Includes gamma correction
|
||||
- Includes any post-processing effects
|
||||
- Linear values reverse sRGB gamma only (not tone mapping)
|
||||
|
||||
### Picking Accuracy
|
||||
|
||||
Cursor may not align perfectly with picked pixel:
|
||||
- Crosshair is CSS-based (not pixel-perfect)
|
||||
- High-DPI displays may have sub-pixel offsets
|
||||
- Solution: Position display shows exact pixel coordinates
|
||||
|
||||
## Troubleshooting
|
||||
|
||||
### "No color picked yet"
|
||||
|
||||
**Cause**: Trying to copy before picking any color
|
||||
|
||||
**Solution**: Click somewhere in the viewport with picker mode enabled first
|
||||
|
||||
### Color swatch doesn't match viewport
|
||||
|
||||
**Cause**: Possible colorspace mismatch or post-processing
|
||||
|
||||
**Solution**:
|
||||
- Check if tone mapping is enabled
|
||||
- Verify sRGB framebuffer settings
|
||||
- Compare Linear vs Float values
|
||||
|
||||
### Position coordinates seem wrong
|
||||
|
||||
**Cause**: High-DPI display with devicePixelRatio > 1
|
||||
|
||||
**Solution**: This is normal. The right coordinates (WebGL pixels) will be higher than left (mouse pixels) on high-DPI displays.
|
||||
|
||||
### Copy to clipboard doesn't work
|
||||
|
||||
**Cause 1**: Browser doesn't support Clipboard API
|
||||
|
||||
**Solution**: Use a modern browser (Chrome 90+, Firefox 88+, Safari 14+)
|
||||
|
||||
**Cause 2**: Page not served over HTTPS
|
||||
|
||||
**Solution**: Use HTTPS or localhost (Clipboard API requires secure context)
|
||||
|
||||
### Picked color is black (0, 0, 0)
|
||||
|
||||
**Cause 1**: Clicked on background/empty space
|
||||
|
||||
**Solution**: Click on an actual rendered object
|
||||
|
||||
**Cause 2**: Rendering hasn't completed
|
||||
|
||||
**Solution**: Wait for scene to fully load and render before picking
|
||||
|
||||
### Colors look incorrect
|
||||
|
||||
**Cause**: Clicking during camera movement
|
||||
|
||||
**Solution**: Wait for rendering to stabilize before picking
|
||||
|
||||
## Keyboard Shortcuts
|
||||
|
||||
Currently no keyboard shortcuts are implemented, but potential additions:
|
||||
|
||||
- `C` - Toggle color picker mode
|
||||
- `Esc` - Disable color picker mode
|
||||
- `Ctrl+C` - Copy last picked color (default format)
|
||||
|
||||
## Future Enhancements
|
||||
|
||||
Potential improvements:
|
||||
|
||||
- [ ] Export picked colors to palette file
|
||||
- [ ] Color history (save last N picked colors)
|
||||
- [ ] Color comparison (pick two colors and show difference)
|
||||
- [ ] Average color over NxN pixel area (reduce noise)
|
||||
- [ ] Show alpha channel with checkered background
|
||||
- [ ] RGB/HSV/HSL color space display
|
||||
- [ ] Live preview (show color under cursor before clicking)
|
||||
- [ ] Color gradient analysis (sample line between two points)
|
||||
- [ ] HDR color support (for >1.0 values with tone mapping)
|
||||
- [ ] Export as .ase (Adobe Swatch Exchange) palette
|
||||
|
||||
## Related Documentation
|
||||
|
||||
- **[Material JSON Viewer](./README-json-viewer.md)** - Inspect material parameters
|
||||
- **[Node Graph Viewer](./README-node-graph.md)** - Visualize shader networks
|
||||
- **[OpenPBR Parameters Reference](../../../doc/openpbr-parameters-reference.md)** - Parameter details
|
||||
- **[MaterialX Support](../../../doc/materialx.md)** - MaterialX color workflows
|
||||
|
||||
## Example Workflows
|
||||
|
||||
### Workflow 1: Verify Base Color
|
||||
|
||||
Goal: Confirm material base color matches rendered output
|
||||
|
||||
1. Select object with material
|
||||
2. Open Material JSON viewer → OpenPBR tab
|
||||
3. Note `base_color` value: `[0.8, 0.2, 0.1]`
|
||||
4. Enable color picker
|
||||
5. Click on the surface
|
||||
6. Compare Linear RGB: `0.6170, 0.0331, 0.0100`
|
||||
7. Verify gamma-corrected match: `pow(0.8, 2.2) ≈ 0.617` ✓
|
||||
|
||||
### Workflow 2: Debug Texture Colors
|
||||
|
||||
Goal: Verify texture is loading with correct color values
|
||||
|
||||
1. Load model with base color texture
|
||||
2. Enable color picker
|
||||
3. Click on textured surface
|
||||
4. Note RGB values: `204, 102, 51`
|
||||
5. Open source texture in image editor
|
||||
6. Sample same location: `204, 102, 51` ✓ Match
|
||||
7. If mismatch, check texture colorspace settings
|
||||
|
||||
### Workflow 3: Match Colors to Reference
|
||||
|
||||
Goal: Extract exact color from reference model
|
||||
|
||||
1. Load reference USD file
|
||||
2. Enable color picker
|
||||
3. Click on surface to match
|
||||
4. Copy Float values: `0.7529, 0.3765, 0.1882`
|
||||
5. In Blender, paste into Principled BSDF Base Color
|
||||
6. Export as USD with MaterialX
|
||||
7. Colors will match exactly in both renderers
|
||||
|
||||
### Workflow 4: Analyze Environment Lighting
|
||||
|
||||
Goal: Understand IBL contribution to material
|
||||
|
||||
1. Render scene with environment map
|
||||
2. Pick color from metallic surface: `0.4500, 0.5200, 0.6000` (Linear)
|
||||
3. Set `envMapIntensity` to 0
|
||||
4. Re-render and pick again: `0.1000, 0.1000, 0.1000` (Linear)
|
||||
5. Calculate IBL contribution: `(0.45-0.10, 0.52-0.10, 0.60-0.10) = (0.35, 0.42, 0.50)`
|
||||
6. Adjust `envMapIntensity` based on desired lighting strength
|
||||
|
||||
## License
|
||||
|
||||
Part of the TinyUSDZ project (Apache 2.0 License).
|
||||
368
web/js/README-json-viewer.md
Normal file
368
web/js/README-json-viewer.md
Normal file
@@ -0,0 +1,368 @@
|
||||
# Material JSON Viewer
|
||||
|
||||
A comprehensive JSON viewer for inspecting Tydra-converted MaterialX and UsdPreviewSurface material data in the TinyUSDZ web demo.
|
||||
|
||||
## Overview
|
||||
|
||||
The Material JSON Viewer provides a syntax-highlighted, tabbed interface to inspect material data at various stages of the conversion pipeline, from raw USD data to Three.js material properties.
|
||||
|
||||
## Features
|
||||
|
||||
- **Multi-Tab View**: Switch between different material representations
|
||||
- **Syntax Highlighting**: Color-coded JSON for easy reading
|
||||
- **Copy to Clipboard**: One-click copying of JSON data
|
||||
- **Export**: Download material data as JSON files
|
||||
- **Automatic Detection**: Shows available data based on material type
|
||||
|
||||
## Usage
|
||||
|
||||
### Opening the JSON Viewer
|
||||
|
||||
1. Load a USD file with materials
|
||||
2. Select an object or material from the Materials panel
|
||||
3. Click the **📋 Material JSON** button in the top toolbar
|
||||
4. The JSON viewer will open with the material data
|
||||
|
||||
### Viewing Different Data Types
|
||||
|
||||
The viewer has 4 tabs showing different aspects of the material:
|
||||
|
||||
#### 1. OpenPBR Surface Tab
|
||||
Shows the OpenPBR Surface material definition with all layers:
|
||||
|
||||
```json
|
||||
{
|
||||
"name": "MaterialName",
|
||||
"type": "OpenPBR Surface",
|
||||
"hasOpenPBR": true,
|
||||
"openPBR": {
|
||||
"base": {
|
||||
"color": [0.8, 0.8, 0.8],
|
||||
"weight": 1.0,
|
||||
"metalness": 0.0,
|
||||
"diffuse_roughness": 0.0
|
||||
},
|
||||
"specular": {
|
||||
"weight": 1.0,
|
||||
"color": [1.0, 1.0, 1.0],
|
||||
"roughness": 0.3,
|
||||
"ior": 1.5,
|
||||
"anisotropy": 0.0
|
||||
},
|
||||
"transmission": { ... },
|
||||
"coat": { ... },
|
||||
"emission": { ... },
|
||||
"geometry": { ... }
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
**Available when**: Material has OpenPBR data (`hasOpenPBR: true`)
|
||||
|
||||
**Use case**: Understanding the complete OpenPBR material definition, debugging MaterialX export, comparing with Blender exports
|
||||
|
||||
#### 2. UsdPreviewSurface Tab
|
||||
Shows the UsdPreviewSurface material definition:
|
||||
|
||||
```json
|
||||
{
|
||||
"name": "MaterialName",
|
||||
"type": "UsdPreviewSurface",
|
||||
"hasUsdPreviewSurface": true,
|
||||
"usdPreviewSurface": {
|
||||
"diffuseColor": [0.18, 0.18, 0.18],
|
||||
"roughness": 0.5,
|
||||
"metallic": 0.0,
|
||||
"specularColor": [1.0, 1.0, 1.0],
|
||||
"ior": 1.5,
|
||||
"clearcoat": 0.0,
|
||||
"clearcoatRoughness": 0.01,
|
||||
"emissiveColor": [0.0, 0.0, 0.0],
|
||||
"opacity": 1.0,
|
||||
"normal": [0.0, 0.0, 1.0]
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
**Available when**: Material has UsdPreviewSurface data (`hasUsdPreviewSurface: true`)
|
||||
|
||||
**Use case**: Inspecting USD standard material format, understanding fallback materials
|
||||
|
||||
#### 3. Raw Material Data Tab
|
||||
Shows the complete raw material data as received from TinyUSDZ:
|
||||
|
||||
```json
|
||||
{
|
||||
"name": "MaterialName",
|
||||
"hasOpenPBR": true,
|
||||
"hasUsdPreviewSurface": false,
|
||||
"openPBR": { ... },
|
||||
// Additional metadata, texture IDs, etc.
|
||||
}
|
||||
```
|
||||
|
||||
**Available when**: Always (if material selected)
|
||||
|
||||
**Use case**:
|
||||
- Debugging material loading issues
|
||||
- Seeing texture IDs and references
|
||||
- Understanding the complete Tydra conversion output
|
||||
- Finding additional metadata not shown in other tabs
|
||||
|
||||
#### 4. Three.js Material Tab
|
||||
Shows the Three.js MeshPhysicalMaterial properties:
|
||||
|
||||
```json
|
||||
{
|
||||
"type": "MeshPhysicalMaterial",
|
||||
"name": "MaterialName",
|
||||
"uuid": "...",
|
||||
"color": { "r": 0.8, "g": 0.8, "b": 0.8 },
|
||||
"metalness": 0.0,
|
||||
"roughness": 0.3,
|
||||
"ior": 1.5,
|
||||
"transmission": 0.0,
|
||||
"clearcoat": 0.0,
|
||||
"emissive": { "r": 0.0, "g": 0.0, "b": 0.0 },
|
||||
"textures": {
|
||||
"map": "Texture(123)",
|
||||
"normalMap": "Texture(124)",
|
||||
"roughnessMap": "Texture(125)"
|
||||
},
|
||||
"envMapIntensity": 1.0
|
||||
}
|
||||
```
|
||||
|
||||
**Available when**: Material has been converted to Three.js
|
||||
|
||||
**Use case**:
|
||||
- Understanding how MaterialX/USD converts to Three.js
|
||||
- Debugging rendering issues
|
||||
- Verifying texture assignments
|
||||
- Checking final material state used for rendering
|
||||
|
||||
### Syntax Highlighting
|
||||
|
||||
JSON is color-coded for readability:
|
||||
- **Blue** (`#79B8FF`): Property keys
|
||||
- **Light Blue** (`#9ECBFF`): String values
|
||||
- **Red** (`#F97583`): Number values
|
||||
- **Orange** (`#FFAB70`): Boolean values (true/false)
|
||||
- **Purple** (`#B392F0`): null values
|
||||
|
||||
### Actions
|
||||
|
||||
**Copy to Clipboard**
|
||||
- Copies the current tab's JSON to clipboard
|
||||
- Button shows "✓ Copied!" confirmation
|
||||
- Use for pasting into documentation, bug reports, or analysis tools
|
||||
|
||||
**Download JSON**
|
||||
- Downloads current tab as a `.json` file
|
||||
- Filename format: `{materialname}_{tabtype}.json`
|
||||
- Examples:
|
||||
- `MetallicMaterial_openpbr.json`
|
||||
- `GlassMaterial_usdpreview.json`
|
||||
- `WoodMaterial_raw.json`
|
||||
- `PlasticMaterial_threejs.json`
|
||||
|
||||
**Close**
|
||||
- Closes the JSON viewer
|
||||
- Can also press ESC (if implemented)
|
||||
|
||||
## Use Cases
|
||||
|
||||
### 1. Debugging Material Conversion
|
||||
|
||||
When a material doesn't look right in the viewer:
|
||||
|
||||
1. Open JSON viewer
|
||||
2. Check **Raw Material Data** tab to see what TinyUSDZ loaded
|
||||
3. Check **OpenPBR/UsdPreviewSurface** tab to see converted data
|
||||
4. Check **Three.js Material** tab to see final rendering material
|
||||
5. Compare values to identify conversion issues
|
||||
|
||||
### 2. MaterialX Export Verification
|
||||
|
||||
When exporting materials to MaterialX:
|
||||
|
||||
1. Select material
|
||||
2. Open JSON viewer → **OpenPBR** tab
|
||||
3. Export material as MaterialX using "Export MaterialX (.mtlx)" button
|
||||
4. Compare JSON values with exported MaterialX XML
|
||||
5. Verify parameter mapping is correct
|
||||
|
||||
### 3. Blender Comparison
|
||||
|
||||
When comparing Blender's MaterialX export with TinyUSDZ:
|
||||
|
||||
1. Export from Blender with MaterialX enabled
|
||||
2. Load in TinyUSDZ demo
|
||||
3. Open JSON viewer → **OpenPBR** tab
|
||||
4. Compare with Blender's Principled BSDF → OpenPBR mapping (see [materialx.md](../../../doc/materialx.md))
|
||||
5. Verify parameter names and values match
|
||||
|
||||
### 4. Documentation & Bug Reports
|
||||
|
||||
When reporting issues or documenting materials:
|
||||
|
||||
1. Select problematic material
|
||||
2. Open JSON viewer
|
||||
3. Click "Copy to Clipboard" or "Download JSON"
|
||||
4. Paste into GitHub issue, documentation, or email
|
||||
5. Provides complete material context for debugging
|
||||
|
||||
### 5. Learning MaterialX
|
||||
|
||||
When learning about MaterialX structure:
|
||||
|
||||
1. Load various sample materials
|
||||
2. Open JSON viewer
|
||||
3. Switch between tabs to see different representations
|
||||
4. Understand how USD → MaterialX → Three.js conversion works
|
||||
5. See relationship between different material systems
|
||||
|
||||
## Technical Details
|
||||
|
||||
### Implementation
|
||||
|
||||
The JSON viewer is implemented in `material-json-viewer.js`:
|
||||
|
||||
**Key Functions:**
|
||||
- `showMaterialJSON(material)` - Display material data
|
||||
- `extractOpenPBRData(materialData)` - Extract OpenPBR subset
|
||||
- `extractUsdPreviewSurfaceData(materialData)` - Extract UsdPreviewSurface subset
|
||||
- `extractThreeMaterialData(threeMaterial)` - Extract Three.js properties
|
||||
- `syntaxHighlightJSON(json)` - Apply color coding
|
||||
|
||||
### Data Flow
|
||||
|
||||
```
|
||||
USD File
|
||||
↓
|
||||
TinyUSDZ Parser
|
||||
↓
|
||||
Tydra Conversion
|
||||
↓
|
||||
Material Data Object ← [RAW TAB]
|
||||
├─→ OpenPBR Data ← [OPENPBR TAB]
|
||||
└─→ UsdPreviewSurface Data ← [USDPREVIEW TAB]
|
||||
↓
|
||||
Three.js Material ← [THREEJS TAB]
|
||||
↓
|
||||
WebGL Rendering
|
||||
```
|
||||
|
||||
### Integration with Material Selection
|
||||
|
||||
When an object or material is selected:
|
||||
|
||||
```javascript
|
||||
// In selectObject() or selectMaterial()
|
||||
window.selectedMaterialForExport = material;
|
||||
|
||||
// JSON viewer reads from global
|
||||
const selectedMaterial = window.selectedMaterialForExport;
|
||||
showMaterialJSON(selectedMaterial);
|
||||
```
|
||||
|
||||
### Texture ID Handling
|
||||
|
||||
Texture references in the JSON show as:
|
||||
```json
|
||||
"base_color": {
|
||||
"textureId": 5,
|
||||
"value": [1.0, 1.0, 1.0]
|
||||
}
|
||||
```
|
||||
|
||||
The Three.js tab shows loaded textures as:
|
||||
```json
|
||||
"textures": {
|
||||
"map": "Texture(123)" // Three.js texture ID
|
||||
}
|
||||
```
|
||||
|
||||
## Keyboard Shortcuts
|
||||
|
||||
Currently no keyboard shortcuts implemented, but could add:
|
||||
- `ESC` - Close viewer
|
||||
- `Ctrl+C` - Copy current tab
|
||||
- `1-4` - Switch between tabs
|
||||
|
||||
## Browser Compatibility
|
||||
|
||||
- **Copy to Clipboard**: Requires modern browser with Clipboard API
|
||||
- **Syntax Highlighting**: Works in all browsers (pure CSS/JavaScript)
|
||||
- **Download**: Works in all modern browsers
|
||||
|
||||
## Performance
|
||||
|
||||
- **Small materials** (<100 properties): Instant display
|
||||
- **Large materials** (>500 properties): Minor lag on tab switch
|
||||
- **Very large materials** (>2000 properties): May see scrolling lag
|
||||
|
||||
The viewer is optimized for typical material sizes (50-200 properties).
|
||||
|
||||
## Comparison with Other Tools
|
||||
|
||||
| Feature | Material JSON Viewer | Browser DevTools | External JSON Viewer |
|
||||
|---------|---------------------|------------------|---------------------|
|
||||
| Syntax highlighting | ✓ | ✓ | ✓ |
|
||||
| Material-specific tabs | ✓ | ✗ | ✗ |
|
||||
| One-click copy | ✓ | Partial | ✓ |
|
||||
| Material context | ✓ | ✗ | ✗ |
|
||||
| Three.js integration | ✓ | ✗ | ✗ |
|
||||
| No external tool needed | ✓ | ✓ | ✗ |
|
||||
|
||||
## Future Enhancements
|
||||
|
||||
Potential improvements:
|
||||
- [ ] Search/filter within JSON
|
||||
- [ ] Collapse/expand nested objects
|
||||
- [ ] Dark/light theme toggle
|
||||
- [ ] Diff view (compare two materials)
|
||||
- [ ] Edit mode (modify values and apply)
|
||||
- [ ] Export to MaterialX XML directly
|
||||
- [ ] Export to YAML/TOML formats
|
||||
- [ ] Pretty-print options (compact/expanded)
|
||||
- [ ] Keyboard shortcuts
|
||||
- [ ] History (view previous materials)
|
||||
- [ ] Pin multiple materials for comparison
|
||||
|
||||
## Troubleshooting
|
||||
|
||||
**"No material selected"**
|
||||
- Select an object by clicking it in the 3D view, or
|
||||
- Select a material from the Materials panel
|
||||
|
||||
**"No OpenPBR data available"**
|
||||
- Material doesn't have OpenPBR definition
|
||||
- Try the UsdPreviewSurface tab instead
|
||||
- Check Raw Material Data to see what's available
|
||||
|
||||
**"No UsdPreviewSurface data available"**
|
||||
- Material doesn't have UsdPreviewSurface definition
|
||||
- Try the OpenPBR tab instead
|
||||
- Material might only have one type defined
|
||||
|
||||
**Copy to clipboard doesn't work**
|
||||
- Browser might not support Clipboard API
|
||||
- Try Download JSON instead
|
||||
- Check browser console for errors
|
||||
|
||||
**JSON looks incorrect**
|
||||
- Verify material loaded correctly
|
||||
- Check Raw Material Data tab for source
|
||||
- Report issue with both Raw and converted data
|
||||
|
||||
## Related Documentation
|
||||
|
||||
- **[OpenPBR Parameters Reference](../../../doc/openpbr-parameters-reference.md)** - OpenPBR parameter details
|
||||
- **[MaterialX Support](../../../doc/materialx.md)** - Blender MaterialX export mapping
|
||||
- **[Node Graph Viewer](./README-node-graph.md)** - Visual material graph
|
||||
- **[TinyUSDZ API](../../../README.md)** - USD loading and parsing
|
||||
|
||||
## License
|
||||
|
||||
Part of the TinyUSDZ project (Apache 2.0 License).
|
||||
201
web/js/README-node-graph.md
Normal file
201
web/js/README-node-graph.md
Normal file
@@ -0,0 +1,201 @@
|
||||
# MaterialX Node Graph Viewer
|
||||
|
||||
A lightweight, interactive node graph visualization system for MaterialX/OpenPBR materials in the TinyUSDZ web demo.
|
||||
|
||||
## Overview
|
||||
|
||||
The Node Graph Viewer provides a Blender-style node editor interface to visualize and understand MaterialX shader networks. It uses [LiteGraph.js](https://github.com/jagenjo/litegraph.js), a permissive MIT-licensed graph node engine.
|
||||
|
||||
## Features
|
||||
|
||||
- **Visual Node Network**: See the complete shader network including textures, parameters, and connections
|
||||
- **OpenPBR Surface Support**: Displays OpenPBR materials with all layers (base, specular, transmission, coat, emission)
|
||||
- **Interactive Navigation**: Pan, zoom, and explore complex material graphs
|
||||
- **Automatic Layout**: Smart node positioning for clarity
|
||||
- **Export**: Save node graphs as JSON for documentation or external tools
|
||||
|
||||
## Usage
|
||||
|
||||
### Opening the Node Graph
|
||||
|
||||
1. Load a USD file with MaterialX materials
|
||||
2. Select a material from the Materials panel (bottom-left)
|
||||
3. Click the **🔗 Node Graph** button in the top toolbar
|
||||
4. The node graph viewer will open in a full-screen overlay
|
||||
|
||||
### Navigation
|
||||
|
||||
- **Pan**: Click and drag the canvas background
|
||||
- **Zoom**: Scroll mouse wheel or pinch trackpad
|
||||
- **Center View**: Click the "Center" button
|
||||
- **Close**: Click the "Close" button or press ESC
|
||||
|
||||
### Node Types
|
||||
|
||||
#### OpenPBR Surface (Purple)
|
||||
The main shader node with inputs for all OpenPBR parameters:
|
||||
- Base Color, Weight, Metalness, Roughness
|
||||
- Specular Weight, Color, Roughness, IOR, Anisotropy
|
||||
- Transmission Weight, Color
|
||||
- Coat Weight, Color, Roughness, IOR
|
||||
- Emission Color, Luminance
|
||||
- Opacity, Normal
|
||||
|
||||
#### Image/Texture (Green)
|
||||
Represents texture maps with:
|
||||
- File path display
|
||||
- Color space information
|
||||
- RGB and alpha channel outputs
|
||||
|
||||
#### Constant Color (Yellow/Orange)
|
||||
Fixed color values with visual preview
|
||||
|
||||
#### Constant Float (Blue)
|
||||
Numeric parameter values
|
||||
|
||||
#### Material Output (Pink)
|
||||
Final shader output node
|
||||
|
||||
### Node Graph Controls
|
||||
|
||||
**In the header:**
|
||||
- **Center**: Reset view to show all nodes
|
||||
- **Export JSON**: Save the graph structure
|
||||
- **Close**: Exit the node graph viewer
|
||||
|
||||
**In the info panel (bottom-left):**
|
||||
- Current zoom level
|
||||
- Total node count
|
||||
- Keyboard shortcuts reminder
|
||||
|
||||
## Technical Details
|
||||
|
||||
### Implementation
|
||||
|
||||
The node graph system is split into two files:
|
||||
|
||||
1. **materialx-node-graph.js**: Standalone module with all node graph logic
|
||||
- Node type definitions
|
||||
- Graph creation from MaterialX data
|
||||
- UI management
|
||||
- Export functionality
|
||||
|
||||
2. **materialx.js**: Main application with integration
|
||||
- Imports and initializes the node graph module
|
||||
- Provides material data to visualizer
|
||||
- Handles user interactions
|
||||
|
||||
### Node Graph Data Structure
|
||||
|
||||
The graph is constructed from the MaterialX/OpenPBR data structure:
|
||||
|
||||
```javascript
|
||||
{
|
||||
hasOpenPBR: true,
|
||||
name: "MaterialName",
|
||||
openPBR: {
|
||||
base: { color: [r,g,b], weight: 1.0, metalness: 0.0, ... },
|
||||
specular: { roughness: 0.3, ior: 1.5, ... },
|
||||
transmission: { weight: 0.0, ... },
|
||||
coat: { weight: 0.0, ... },
|
||||
emission: { color: [r,g,b], luminance: 0.0 },
|
||||
geometry: { opacity: 1.0, ... }
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
### LiteGraph.js Integration
|
||||
|
||||
LiteGraph.js is loaded via CDN:
|
||||
```html
|
||||
<script src="https://cdn.jsdelivr.net/npm/litegraph.js@0.7.0/build/litegraph.js"></script>
|
||||
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/litegraph.js@0.7.0/css/litegraph.css">
|
||||
```
|
||||
|
||||
Custom MaterialX node types are registered at initialization:
|
||||
```javascript
|
||||
LiteGraph.registerNodeType("materialx/openpbr_surface", OpenPBRSurfaceNode);
|
||||
LiteGraph.registerNodeType("materialx/image", ImageNode);
|
||||
LiteGraph.registerNodeType("materialx/constant_color", ConstantColorNode);
|
||||
// ... etc
|
||||
```
|
||||
|
||||
## Customization
|
||||
|
||||
### Adding New Node Types
|
||||
|
||||
To add support for additional MaterialX nodes:
|
||||
|
||||
1. Define the node class in `materialx-node-graph.js`:
|
||||
```javascript
|
||||
function MyCustomNode() {
|
||||
this.addInput("Input", "type");
|
||||
this.addOutput("Output", "type");
|
||||
this.properties = { value: 0 };
|
||||
this.color = "#HEXCOLOR";
|
||||
this.size = [width, height];
|
||||
}
|
||||
MyCustomNode.title = "My Node";
|
||||
MyCustomNode.desc = "Description";
|
||||
```
|
||||
|
||||
2. Register it:
|
||||
```javascript
|
||||
LiteGraph.registerNodeType("materialx/my_node", MyCustomNode);
|
||||
```
|
||||
|
||||
3. Add creation logic in `createOpenPBRGraph()` or `createUsdPreviewSurfaceGraph()`
|
||||
|
||||
### Styling
|
||||
|
||||
Node colors can be customized via the `color` property:
|
||||
- Purple (`#673AB7`): Shader nodes
|
||||
- Green (`#4CAF50`): Textures
|
||||
- Yellow (`#FFC107`): Colors
|
||||
- Blue (`#03A9F4`): Floats
|
||||
- Pink (`#E91E63`): Outputs
|
||||
|
||||
CSS overrides in `materialx.html` control the overall appearance.
|
||||
|
||||
## Browser Compatibility
|
||||
|
||||
- **Modern browsers**: Chrome, Firefox, Edge, Safari (latest versions)
|
||||
- **Requirements**: ES6 modules, Canvas API
|
||||
- **Recommended**: Hardware acceleration enabled
|
||||
|
||||
## Performance
|
||||
|
||||
- **Light graphs** (<20 nodes): Smooth 60fps interaction
|
||||
- **Medium graphs** (20-50 nodes): Good performance
|
||||
- **Large graphs** (>50 nodes): May see minor lag on zoom/pan
|
||||
|
||||
## Future Enhancements
|
||||
|
||||
Potential improvements for future versions:
|
||||
|
||||
- [ ] Node editing (change parameter values)
|
||||
- [ ] Real-time material preview on parameter changes
|
||||
- [ ] MaterialX XML import/export from node graph
|
||||
- [ ] Custom node creation UI
|
||||
- [ ] Node search and filtering
|
||||
- [ ] Mini-map for large graphs
|
||||
- [ ] Node grouping/collapse
|
||||
- [ ] Animation of data flow
|
||||
- [ ] Support for more MaterialX node types (math, patterns, etc.)
|
||||
- [ ] UsdPreviewSurface full visualization
|
||||
- [ ] Blender MaterialX export comparison mode
|
||||
|
||||
## License
|
||||
|
||||
This implementation uses:
|
||||
- **LiteGraph.js**: MIT License
|
||||
- **TinyUSDZ**: Apache 2.0 License
|
||||
|
||||
The node graph visualization code is part of the TinyUSDZ project.
|
||||
|
||||
## References
|
||||
|
||||
- [LiteGraph.js Documentation](https://github.com/jagenjo/litegraph.js)
|
||||
- [MaterialX Specification](https://materialx.org/)
|
||||
- [OpenPBR Specification](https://github.com/AcademySoftwareFoundation/OpenPBR)
|
||||
- [Blender MaterialX Documentation](doc/materialx.md)
|
||||
327
web/js/color-picker.js
Normal file
327
web/js/color-picker.js
Normal file
@@ -0,0 +1,327 @@
|
||||
// Color Picker - Pick color values from rendered framebuffer
|
||||
// Reads pixel values directly from WebGL renderer
|
||||
|
||||
let colorPickerActive = false;
|
||||
let colorPickerRenderer = null;
|
||||
let lastPickedColor = null;
|
||||
|
||||
// sRGB to Linear conversion (for color space display)
|
||||
function sRGBToLinear(value) {
|
||||
if (value <= 0.04045) {
|
||||
return value / 12.92;
|
||||
} else {
|
||||
return Math.pow((value + 0.055) / 1.055, 2.4);
|
||||
}
|
||||
}
|
||||
|
||||
// Linear to sRGB conversion
|
||||
function linearToSRGB(value) {
|
||||
if (value <= 0.0031308) {
|
||||
return value * 12.92;
|
||||
} else {
|
||||
return 1.055 * Math.pow(value, 1.0 / 2.4) - 0.055;
|
||||
}
|
||||
}
|
||||
|
||||
// Convert RGB to Hex
|
||||
function rgbToHex(r, g, b) {
|
||||
const toHex = (n) => {
|
||||
const hex = Math.round(n).toString(16).padStart(2, '0');
|
||||
return hex;
|
||||
};
|
||||
return `#${toHex(r)}${toHex(g)}${toHex(b)}`;
|
||||
}
|
||||
|
||||
// Initialize color picker system
|
||||
export function initializeColorPicker(renderer) {
|
||||
colorPickerRenderer = renderer;
|
||||
console.log('Color picker initialized');
|
||||
}
|
||||
|
||||
// Toggle color picker mode
|
||||
export function toggleColorPickerMode() {
|
||||
colorPickerActive = !colorPickerActive;
|
||||
|
||||
const panel = document.getElementById('color-picker-panel');
|
||||
const button = document.getElementById('color-picker-btn');
|
||||
const body = document.body;
|
||||
|
||||
if (colorPickerActive) {
|
||||
// Enable picker mode
|
||||
panel.classList.add('active');
|
||||
button.classList.add('active');
|
||||
body.classList.add('color-picker-mode');
|
||||
console.log('Color picker mode: ON');
|
||||
} else {
|
||||
// Disable picker mode
|
||||
panel.classList.remove('active');
|
||||
button.classList.remove('active');
|
||||
body.classList.remove('color-picker-mode');
|
||||
console.log('Color picker mode: OFF');
|
||||
}
|
||||
}
|
||||
|
||||
// Check if color picker is active
|
||||
export function isColorPickerActive() {
|
||||
return colorPickerActive;
|
||||
}
|
||||
|
||||
// Pick color at mouse position
|
||||
export function pickColorAtPosition(x, y, renderer) {
|
||||
if (!renderer) {
|
||||
console.error('No renderer provided for color picking');
|
||||
return null;
|
||||
}
|
||||
|
||||
// Get renderer size
|
||||
const width = renderer.domElement.width;
|
||||
const height = renderer.domElement.height;
|
||||
|
||||
// Convert mouse coordinates to WebGL coordinates
|
||||
// WebGL origin is bottom-left, mouse origin is top-left
|
||||
const pixelX = Math.floor(x);
|
||||
const pixelY = Math.floor(height - y); // Flip Y coordinate
|
||||
|
||||
// Clamp to valid range
|
||||
const clampedX = Math.max(0, Math.min(width - 1, pixelX));
|
||||
const clampedY = Math.max(0, Math.min(height - 1, pixelY));
|
||||
|
||||
// Read pixel from framebuffer
|
||||
const pixelBuffer = new Uint8Array(4);
|
||||
const gl = renderer.getContext();
|
||||
|
||||
try {
|
||||
// Read pixel at position
|
||||
gl.readPixels(
|
||||
clampedX,
|
||||
clampedY,
|
||||
1, // width
|
||||
1, // height
|
||||
gl.RGBA,
|
||||
gl.UNSIGNED_BYTE,
|
||||
pixelBuffer
|
||||
);
|
||||
|
||||
// Extract RGBA values (0-255)
|
||||
const r = pixelBuffer[0];
|
||||
const g = pixelBuffer[1];
|
||||
const b = pixelBuffer[2];
|
||||
const a = pixelBuffer[3];
|
||||
|
||||
// Convert to float (0-1)
|
||||
const rf = r / 255.0;
|
||||
const gf = g / 255.0;
|
||||
const bf = b / 255.0;
|
||||
const af = a / 255.0;
|
||||
|
||||
// Convert to linear space (assuming sRGB framebuffer)
|
||||
const rLinear = sRGBToLinear(rf);
|
||||
const gLinear = sRGBToLinear(gf);
|
||||
const bLinear = sRGBToLinear(bf);
|
||||
|
||||
const colorData = {
|
||||
// Integer RGB (0-255)
|
||||
rgb: { r, g, b, a },
|
||||
|
||||
// Float RGB (0-1)
|
||||
float: { r: rf, g: gf, b: bf, a: af },
|
||||
|
||||
// Linear RGB (0-1)
|
||||
linear: { r: rLinear, g: gLinear, b: bLinear, a: af },
|
||||
|
||||
// Hex color
|
||||
hex: rgbToHex(r, g, b),
|
||||
|
||||
// Position
|
||||
position: { x: clampedX, y: clampedY }
|
||||
};
|
||||
|
||||
return colorData;
|
||||
} catch (error) {
|
||||
console.error('Error reading pixel:', error);
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
// Display picked color in UI
|
||||
export function displayPickedColor(colorData, mouseX, mouseY) {
|
||||
if (!colorData) return;
|
||||
|
||||
lastPickedColor = colorData;
|
||||
|
||||
// Update color swatch
|
||||
const swatch = document.getElementById('color-swatch');
|
||||
if (swatch) {
|
||||
swatch.style.backgroundColor = colorData.hex;
|
||||
}
|
||||
|
||||
// Update RGB value (0-255)
|
||||
const rgbElement = document.getElementById('color-rgb');
|
||||
if (rgbElement) {
|
||||
rgbElement.textContent = `${colorData.rgb.r}, ${colorData.rgb.g}, ${colorData.rgb.b}`;
|
||||
}
|
||||
|
||||
// Update Hex value
|
||||
const hexElement = document.getElementById('color-hex');
|
||||
if (hexElement) {
|
||||
hexElement.textContent = colorData.hex.toUpperCase();
|
||||
}
|
||||
|
||||
// Update Float value (0-1, sRGB)
|
||||
const floatElement = document.getElementById('color-float');
|
||||
if (floatElement) {
|
||||
const r = colorData.float.r.toFixed(4);
|
||||
const g = colorData.float.g.toFixed(4);
|
||||
const b = colorData.float.b.toFixed(4);
|
||||
floatElement.textContent = `${r}, ${g}, ${b}`;
|
||||
}
|
||||
|
||||
// Update Linear value (0-1, linear RGB)
|
||||
const linearElement = document.getElementById('color-linear');
|
||||
if (linearElement) {
|
||||
const r = colorData.linear.r.toFixed(4);
|
||||
const g = colorData.linear.g.toFixed(4);
|
||||
const b = colorData.linear.b.toFixed(4);
|
||||
linearElement.textContent = `${r}, ${g}, ${b}`;
|
||||
}
|
||||
|
||||
// Update position
|
||||
const positionElement = document.getElementById('color-position');
|
||||
if (positionElement) {
|
||||
positionElement.textContent = `(${mouseX}, ${mouseY}) → (${colorData.position.x}, ${colorData.position.y})`;
|
||||
}
|
||||
|
||||
console.log('Picked color:', colorData);
|
||||
}
|
||||
|
||||
// Handle click for color picking
|
||||
export function handleColorPickerClick(event, renderer) {
|
||||
if (!colorPickerActive || !renderer) return false;
|
||||
|
||||
// Get mouse position relative to canvas
|
||||
const rect = renderer.domElement.getBoundingClientRect();
|
||||
const x = event.clientX - rect.left;
|
||||
const y = event.clientY - rect.top;
|
||||
|
||||
// Convert to device pixels
|
||||
const dpr = window.devicePixelRatio || 1;
|
||||
const canvasX = x * dpr;
|
||||
const canvasY = y * dpr;
|
||||
|
||||
// Pick color at position
|
||||
const colorData = pickColorAtPosition(canvasX, canvasY, renderer);
|
||||
|
||||
if (colorData) {
|
||||
displayPickedColor(colorData, Math.floor(x), Math.floor(y));
|
||||
return true; // Event handled
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
// Copy color value to clipboard
|
||||
export function copyColorValueToClipboard(format) {
|
||||
if (!lastPickedColor) {
|
||||
alert('No color picked yet');
|
||||
return;
|
||||
}
|
||||
|
||||
let textToCopy = '';
|
||||
|
||||
switch (format) {
|
||||
case 'rgb':
|
||||
textToCopy = `${lastPickedColor.rgb.r}, ${lastPickedColor.rgb.g}, ${lastPickedColor.rgb.b}`;
|
||||
break;
|
||||
case 'hex':
|
||||
textToCopy = lastPickedColor.hex.toUpperCase();
|
||||
break;
|
||||
case 'float':
|
||||
const r = lastPickedColor.float.r.toFixed(4);
|
||||
const g = lastPickedColor.float.g.toFixed(4);
|
||||
const b = lastPickedColor.float.b.toFixed(4);
|
||||
textToCopy = `${r}, ${g}, ${b}`;
|
||||
break;
|
||||
case 'linear':
|
||||
const rl = lastPickedColor.linear.r.toFixed(4);
|
||||
const gl = lastPickedColor.linear.g.toFixed(4);
|
||||
const bl = lastPickedColor.linear.b.toFixed(4);
|
||||
textToCopy = `${rl}, ${gl}, ${bl}`;
|
||||
break;
|
||||
default:
|
||||
console.error('Unknown format:', format);
|
||||
return;
|
||||
}
|
||||
|
||||
navigator.clipboard.writeText(textToCopy).then(() => {
|
||||
console.log(`Copied ${format}:`, textToCopy);
|
||||
|
||||
// Show feedback
|
||||
const btn = event.target;
|
||||
const originalText = btn.textContent;
|
||||
btn.textContent = '✓ Copied!';
|
||||
setTimeout(() => {
|
||||
btn.textContent = originalText;
|
||||
}, 1500);
|
||||
}).catch(err => {
|
||||
console.error('Failed to copy:', err);
|
||||
alert('Failed to copy to clipboard');
|
||||
});
|
||||
}
|
||||
|
||||
// Get last picked color data
|
||||
export function getLastPickedColor() {
|
||||
return lastPickedColor;
|
||||
}
|
||||
|
||||
// Reset color picker state
|
||||
export function resetColorPicker() {
|
||||
colorPickerActive = false;
|
||||
lastPickedColor = null;
|
||||
|
||||
const panel = document.getElementById('color-picker-panel');
|
||||
const button = document.getElementById('color-picker-btn');
|
||||
const body = document.body;
|
||||
|
||||
if (panel) panel.classList.remove('active');
|
||||
if (button) button.classList.remove('active');
|
||||
if (body) body.classList.remove('color-picker-mode');
|
||||
}
|
||||
|
||||
// Export color data as JSON
|
||||
export function exportColorData() {
|
||||
if (!lastPickedColor) {
|
||||
alert('No color picked yet');
|
||||
return;
|
||||
}
|
||||
|
||||
const exportData = {
|
||||
timestamp: new Date().toISOString(),
|
||||
color: {
|
||||
rgb_8bit: lastPickedColor.rgb,
|
||||
rgb_float: lastPickedColor.float,
|
||||
rgb_linear: lastPickedColor.linear,
|
||||
hex: lastPickedColor.hex
|
||||
},
|
||||
position: lastPickedColor.position
|
||||
};
|
||||
|
||||
const jsonString = JSON.stringify(exportData, null, 2);
|
||||
const blob = new Blob([jsonString], { type: 'application/json' });
|
||||
const url = URL.createObjectURL(blob);
|
||||
const link = document.createElement('a');
|
||||
link.href = url;
|
||||
link.download = `picked_color_${Date.now()}.json`;
|
||||
document.body.appendChild(link);
|
||||
link.click();
|
||||
document.body.removeChild(link);
|
||||
URL.revokeObjectURL(url);
|
||||
|
||||
console.log('Color data exported');
|
||||
}
|
||||
|
||||
// Make functions globally accessible
|
||||
if (typeof window !== 'undefined') {
|
||||
window.toggleColorPicker = toggleColorPickerMode;
|
||||
window.copyColorValue = copyColorValueToClipboard;
|
||||
window.exportColorData = exportColorData;
|
||||
}
|
||||
392
web/js/material-json-viewer.js
Normal file
392
web/js/material-json-viewer.js
Normal file
@@ -0,0 +1,392 @@
|
||||
// Material JSON Viewer
|
||||
// Displays Tydra converted MaterialX and UsdPreviewSurface material data
|
||||
|
||||
let currentMaterialData = null;
|
||||
let currentActiveTab = 'openpbr';
|
||||
|
||||
// Syntax highlight JSON
|
||||
export function syntaxHighlightJSON(json) {
|
||||
if (typeof json !== 'string') {
|
||||
json = JSON.stringify(json, null, 2);
|
||||
}
|
||||
|
||||
// Replace special characters and add syntax highlighting
|
||||
json = json.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>');
|
||||
|
||||
return json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, function (match) {
|
||||
let cls = 'json-number';
|
||||
if (/^"/.test(match)) {
|
||||
if (/:$/.test(match)) {
|
||||
cls = 'json-key';
|
||||
} else {
|
||||
cls = 'json-string';
|
||||
}
|
||||
} else if (/true|false/.test(match)) {
|
||||
cls = 'json-boolean';
|
||||
} else if (/null/.test(match)) {
|
||||
cls = 'json-null';
|
||||
}
|
||||
return '<span class="' + cls + '">' + match + '</span>';
|
||||
});
|
||||
}
|
||||
|
||||
// Extract OpenPBR data from material
|
||||
function extractOpenPBRData(materialData) {
|
||||
if (!materialData || !materialData.hasOpenPBR) {
|
||||
return null;
|
||||
}
|
||||
|
||||
return {
|
||||
name: materialData.name,
|
||||
type: "OpenPBR Surface",
|
||||
hasOpenPBR: true,
|
||||
openPBR: materialData.openPBR
|
||||
};
|
||||
}
|
||||
|
||||
// Extract UsdPreviewSurface data from material
|
||||
function extractUsdPreviewSurfaceData(materialData) {
|
||||
if (!materialData || !materialData.hasUsdPreviewSurface) {
|
||||
return null;
|
||||
}
|
||||
|
||||
return {
|
||||
name: materialData.name,
|
||||
type: "UsdPreviewSurface",
|
||||
hasUsdPreviewSurface: true,
|
||||
usdPreviewSurface: materialData.usdPreviewSurface
|
||||
};
|
||||
}
|
||||
|
||||
// Extract Three.js material properties
|
||||
function extractThreeMaterialData(threeMaterial) {
|
||||
if (!threeMaterial) {
|
||||
return null;
|
||||
}
|
||||
|
||||
// Extract relevant properties
|
||||
const data = {
|
||||
type: threeMaterial.type,
|
||||
name: threeMaterial.name,
|
||||
uuid: threeMaterial.uuid,
|
||||
|
||||
// Basic properties
|
||||
color: threeMaterial.color ? {
|
||||
r: threeMaterial.color.r,
|
||||
g: threeMaterial.color.g,
|
||||
b: threeMaterial.color.b
|
||||
} : undefined,
|
||||
|
||||
// PBR properties
|
||||
metalness: threeMaterial.metalness,
|
||||
roughness: threeMaterial.roughness,
|
||||
ior: threeMaterial.ior,
|
||||
|
||||
// Specular
|
||||
specularIntensity: threeMaterial.specularIntensity,
|
||||
specularColor: threeMaterial.specularColor ? {
|
||||
r: threeMaterial.specularColor.r,
|
||||
g: threeMaterial.specularColor.g,
|
||||
b: threeMaterial.specularColor.b
|
||||
} : undefined,
|
||||
|
||||
// Transmission
|
||||
transmission: threeMaterial.transmission,
|
||||
attenuationColor: threeMaterial.attenuationColor ? {
|
||||
r: threeMaterial.attenuationColor.r,
|
||||
g: threeMaterial.attenuationColor.g,
|
||||
b: threeMaterial.attenuationColor.b
|
||||
} : undefined,
|
||||
attenuationDistance: threeMaterial.attenuationDistance,
|
||||
|
||||
// Clearcoat
|
||||
clearcoat: threeMaterial.clearcoat,
|
||||
clearcoatRoughness: threeMaterial.clearcoatRoughness,
|
||||
|
||||
// Sheen
|
||||
sheen: threeMaterial.sheen,
|
||||
sheenRoughness: threeMaterial.sheenRoughness,
|
||||
sheenColor: threeMaterial.sheenColor ? {
|
||||
r: threeMaterial.sheenColor.r,
|
||||
g: threeMaterial.sheenColor.g,
|
||||
b: threeMaterial.sheenColor.b
|
||||
} : undefined,
|
||||
|
||||
// Iridescence
|
||||
iridescence: threeMaterial.iridescence,
|
||||
iridescenceIOR: threeMaterial.iridescenceIOR,
|
||||
iridescenceThicknessRange: threeMaterial.iridescenceThicknessRange,
|
||||
|
||||
// Emission
|
||||
emissive: threeMaterial.emissive ? {
|
||||
r: threeMaterial.emissive.r,
|
||||
g: threeMaterial.emissive.g,
|
||||
b: threeMaterial.emissive.b
|
||||
} : undefined,
|
||||
emissiveIntensity: threeMaterial.emissiveIntensity,
|
||||
|
||||
// Other
|
||||
opacity: threeMaterial.opacity,
|
||||
transparent: threeMaterial.transparent,
|
||||
side: threeMaterial.side,
|
||||
|
||||
// Textures
|
||||
textures: {
|
||||
map: threeMaterial.map ? `Texture(${threeMaterial.map.id})` : null,
|
||||
normalMap: threeMaterial.normalMap ? `Texture(${threeMaterial.normalMap.id})` : null,
|
||||
roughnessMap: threeMaterial.roughnessMap ? `Texture(${threeMaterial.roughnessMap.id})` : null,
|
||||
metalnessMap: threeMaterial.metalnessMap ? `Texture(${threeMaterial.metalnessMap.id})` : null,
|
||||
emissiveMap: threeMaterial.emissiveMap ? `Texture(${threeMaterial.emissiveMap.id})` : null,
|
||||
aoMap: threeMaterial.aoMap ? `Texture(${threeMaterial.aoMap.id})` : null,
|
||||
},
|
||||
|
||||
// Environment
|
||||
envMapIntensity: threeMaterial.envMapIntensity
|
||||
};
|
||||
|
||||
// Remove undefined properties
|
||||
Object.keys(data).forEach(key => {
|
||||
if (data[key] === undefined) {
|
||||
delete data[key];
|
||||
}
|
||||
});
|
||||
|
||||
if (data.textures) {
|
||||
Object.keys(data.textures).forEach(key => {
|
||||
if (data.textures[key] === null) {
|
||||
delete data.textures[key];
|
||||
}
|
||||
});
|
||||
if (Object.keys(data.textures).length === 0) {
|
||||
delete data.textures;
|
||||
}
|
||||
}
|
||||
|
||||
return data;
|
||||
}
|
||||
|
||||
// Show material JSON viewer
|
||||
export function showMaterialJSON(material) {
|
||||
if (!material) {
|
||||
console.error('No material to display');
|
||||
return;
|
||||
}
|
||||
|
||||
currentMaterialData = material;
|
||||
|
||||
const wrapper = document.getElementById('material-json-wrapper');
|
||||
const title = document.getElementById('material-json-title');
|
||||
|
||||
if (!wrapper) {
|
||||
console.error('Material JSON wrapper not found');
|
||||
return;
|
||||
}
|
||||
|
||||
// Update title
|
||||
const materialName = material.name || 'Unknown Material';
|
||||
title.textContent = `Material Data - ${materialName}`;
|
||||
|
||||
// Update all tab contents
|
||||
updateTabContent('openpbr', material);
|
||||
updateTabContent('usdpreview', material);
|
||||
updateTabContent('raw', material);
|
||||
updateTabContent('threejs', material);
|
||||
|
||||
// Show wrapper
|
||||
wrapper.classList.add('visible');
|
||||
|
||||
console.log('Material JSON viewer displayed');
|
||||
}
|
||||
|
||||
// Hide material JSON viewer
|
||||
export function hideMaterialJSON() {
|
||||
const wrapper = document.getElementById('material-json-wrapper');
|
||||
if (wrapper) {
|
||||
wrapper.classList.remove('visible');
|
||||
}
|
||||
}
|
||||
|
||||
// Toggle material JSON visibility
|
||||
export function toggleMaterialJSONVisibility() {
|
||||
const wrapper = document.getElementById('material-json-wrapper');
|
||||
if (!wrapper) return;
|
||||
|
||||
if (wrapper.classList.contains('visible')) {
|
||||
hideMaterialJSON();
|
||||
} else {
|
||||
// Show JSON for currently selected material
|
||||
const selectedMaterial = window.selectedMaterialForExport;
|
||||
if (selectedMaterial) {
|
||||
showMaterialJSON(selectedMaterial);
|
||||
} else {
|
||||
alert('Please select a material from the Materials panel first');
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Update tab content
|
||||
function updateTabContent(tabName, material) {
|
||||
const contentElement = document.getElementById(`json-content-${tabName}`);
|
||||
if (!contentElement) return;
|
||||
|
||||
let data = null;
|
||||
let jsonString = '';
|
||||
|
||||
switch (tabName) {
|
||||
case 'openpbr':
|
||||
data = extractOpenPBRData(material.data);
|
||||
if (data) {
|
||||
jsonString = syntaxHighlightJSON(data);
|
||||
} else {
|
||||
jsonString = '<span class="json-null">No OpenPBR data available for this material</span>';
|
||||
}
|
||||
break;
|
||||
|
||||
case 'usdpreview':
|
||||
data = extractUsdPreviewSurfaceData(material.data);
|
||||
if (data) {
|
||||
jsonString = syntaxHighlightJSON(data);
|
||||
} else {
|
||||
jsonString = '<span class="json-null">No UsdPreviewSurface data available for this material</span>';
|
||||
}
|
||||
break;
|
||||
|
||||
case 'raw':
|
||||
if (material.data) {
|
||||
jsonString = syntaxHighlightJSON(material.data);
|
||||
} else {
|
||||
jsonString = '<span class="json-null">No raw material data available</span>';
|
||||
}
|
||||
break;
|
||||
|
||||
case 'threejs':
|
||||
data = extractThreeMaterialData(material.threeMaterial);
|
||||
if (data) {
|
||||
jsonString = syntaxHighlightJSON(data);
|
||||
} else {
|
||||
jsonString = '<span class="json-null">No Three.js material data available</span>';
|
||||
}
|
||||
break;
|
||||
}
|
||||
|
||||
contentElement.innerHTML = `<pre>${jsonString}</pre>`;
|
||||
}
|
||||
|
||||
// Switch between tabs
|
||||
export function switchMaterialTab(tabName) {
|
||||
// Update tabs
|
||||
document.querySelectorAll('.material-json-tab').forEach(tab => {
|
||||
tab.classList.remove('active');
|
||||
});
|
||||
document.querySelector(`[data-tab="${tabName}"]`)?.classList.add('active');
|
||||
|
||||
// Update content
|
||||
document.querySelectorAll('.material-json-content').forEach(content => {
|
||||
content.classList.remove('active');
|
||||
});
|
||||
document.getElementById(`json-content-${tabName}`)?.classList.add('active');
|
||||
|
||||
currentActiveTab = tabName;
|
||||
}
|
||||
|
||||
// Copy current tab JSON to clipboard
|
||||
export function copyMaterialJSONToClipboard() {
|
||||
if (!currentMaterialData) {
|
||||
alert('No material data to copy');
|
||||
return;
|
||||
}
|
||||
|
||||
let data = null;
|
||||
|
||||
switch (currentActiveTab) {
|
||||
case 'openpbr':
|
||||
data = extractOpenPBRData(currentMaterialData.data);
|
||||
break;
|
||||
case 'usdpreview':
|
||||
data = extractUsdPreviewSurfaceData(currentMaterialData.data);
|
||||
break;
|
||||
case 'raw':
|
||||
data = currentMaterialData.data;
|
||||
break;
|
||||
case 'threejs':
|
||||
data = extractThreeMaterialData(currentMaterialData.threeMaterial);
|
||||
break;
|
||||
}
|
||||
|
||||
if (!data) {
|
||||
alert('No data available for this tab');
|
||||
return;
|
||||
}
|
||||
|
||||
const jsonString = JSON.stringify(data, null, 2);
|
||||
|
||||
navigator.clipboard.writeText(jsonString).then(() => {
|
||||
console.log('Material JSON copied to clipboard');
|
||||
// Show temporary notification
|
||||
const btn = event.target;
|
||||
const originalText = btn.textContent;
|
||||
btn.textContent = '✓ Copied!';
|
||||
setTimeout(() => {
|
||||
btn.textContent = originalText;
|
||||
}, 2000);
|
||||
}).catch(err => {
|
||||
console.error('Failed to copy to clipboard:', err);
|
||||
alert('Failed to copy to clipboard. See console for details.');
|
||||
});
|
||||
}
|
||||
|
||||
// Download current tab JSON
|
||||
export function downloadMaterialJSONFile() {
|
||||
if (!currentMaterialData) {
|
||||
alert('No material data to download');
|
||||
return;
|
||||
}
|
||||
|
||||
let data = null;
|
||||
let suffix = '';
|
||||
|
||||
switch (currentActiveTab) {
|
||||
case 'openpbr':
|
||||
data = extractOpenPBRData(currentMaterialData.data);
|
||||
suffix = '_openpbr';
|
||||
break;
|
||||
case 'usdpreview':
|
||||
data = extractUsdPreviewSurfaceData(currentMaterialData.data);
|
||||
suffix = '_usdpreview';
|
||||
break;
|
||||
case 'raw':
|
||||
data = currentMaterialData.data;
|
||||
suffix = '_raw';
|
||||
break;
|
||||
case 'threejs':
|
||||
data = extractThreeMaterialData(currentMaterialData.threeMaterial);
|
||||
suffix = '_threejs';
|
||||
break;
|
||||
}
|
||||
|
||||
if (!data) {
|
||||
alert('No data available for this tab');
|
||||
return;
|
||||
}
|
||||
|
||||
const jsonString = JSON.stringify(data, null, 2);
|
||||
const blob = new Blob([jsonString], { type: 'application/json' });
|
||||
const url = URL.createObjectURL(blob);
|
||||
const link = document.createElement('a');
|
||||
link.href = url;
|
||||
link.download = `${currentMaterialData.name || 'material'}${suffix}.json`;
|
||||
document.body.appendChild(link);
|
||||
link.click();
|
||||
document.body.removeChild(link);
|
||||
URL.revokeObjectURL(url);
|
||||
|
||||
console.log('Material JSON downloaded');
|
||||
}
|
||||
|
||||
// Make functions globally accessible
|
||||
if (typeof window !== 'undefined') {
|
||||
window.toggleMaterialJSON = toggleMaterialJSONVisibility;
|
||||
window.switchMaterialTab = switchMaterialTab;
|
||||
window.copyMaterialJSON = copyMaterialJSONToClipboard;
|
||||
window.downloadMaterialJSON = downloadMaterialJSONFile;
|
||||
}
|
||||
516
web/js/materialx-node-graph.js
Normal file
516
web/js/materialx-node-graph.js
Normal file
@@ -0,0 +1,516 @@
|
||||
// MaterialX Node Graph Viewer using LiteGraph.js
|
||||
// This module provides visualization for MaterialX/OpenPBR material node graphs
|
||||
|
||||
// Global variables for node graph
|
||||
let nodeGraph = null; // LGraph instance
|
||||
let nodeGraphCanvas = null; // LGraphCanvas instance
|
||||
let currentMaterialForGraph = null; // Material currently displayed in graph
|
||||
|
||||
// Initialize node graph system
|
||||
export function initializeNodeGraph() {
|
||||
console.log('Initializing MaterialX Node Graph system...');
|
||||
|
||||
// Check if LiteGraph is available
|
||||
if (typeof LiteGraph === 'undefined' || typeof LGraph === 'undefined') {
|
||||
console.error('LiteGraph.js not loaded! Node graph functionality will be disabled.');
|
||||
return false;
|
||||
}
|
||||
|
||||
console.log('LiteGraph.js loaded successfully');
|
||||
return true;
|
||||
}
|
||||
|
||||
// Custom MaterialX node types for LiteGraph
|
||||
|
||||
// OpenPBR Surface Shader Node
|
||||
function OpenPBRSurfaceNode() {
|
||||
this.addOutput("Surface", "surface");
|
||||
|
||||
// Base layer inputs
|
||||
this.addInput("Base Color", "color3");
|
||||
this.addInput("Base Weight", "float");
|
||||
this.addInput("Base Metalness", "float");
|
||||
this.addInput("Base Roughness", "float");
|
||||
|
||||
// Specular layer inputs
|
||||
this.addInput("Specular Weight", "float");
|
||||
this.addInput("Specular Color", "color3");
|
||||
this.addInput("Specular Roughness", "float");
|
||||
this.addInput("Specular IOR", "float");
|
||||
this.addInput("Specular Anisotropy", "float");
|
||||
|
||||
// Transmission inputs
|
||||
this.addInput("Transmission Weight", "float");
|
||||
this.addInput("Transmission Color", "color3");
|
||||
|
||||
// Coat inputs
|
||||
this.addInput("Coat Weight", "float");
|
||||
this.addInput("Coat Color", "color3");
|
||||
this.addInput("Coat Roughness", "float");
|
||||
this.addInput("Coat IOR", "float");
|
||||
|
||||
// Emission inputs
|
||||
this.addInput("Emission Color", "color3");
|
||||
this.addInput("Emission Luminance", "float");
|
||||
|
||||
// Geometry inputs
|
||||
this.addInput("Opacity", "float");
|
||||
this.addInput("Normal", "vector3");
|
||||
|
||||
this.properties = {};
|
||||
this.color = "#673AB7";
|
||||
this.bgcolor = "#1a1a1a";
|
||||
this.size = [220, 360];
|
||||
}
|
||||
|
||||
OpenPBRSurfaceNode.title = "OpenPBR Surface";
|
||||
OpenPBRSurfaceNode.desc = "OpenPBR Surface Shader";
|
||||
|
||||
// Image/Texture Node
|
||||
function ImageNode() {
|
||||
this.addInput("UV", "vector2");
|
||||
this.addOutput("Color", "color3");
|
||||
this.addOutput("R", "float");
|
||||
this.addOutput("G", "float");
|
||||
this.addOutput("B", "float");
|
||||
this.addOutput("A", "float");
|
||||
|
||||
this.addProperty("file", "", "string");
|
||||
this.addProperty("colorspace", "srgb", "enum", {
|
||||
values: ["srgb", "linear", "rec709", "aces", "acescg", "raw"]
|
||||
});
|
||||
|
||||
this.color = "#4CAF50";
|
||||
this.bgcolor = "#1a1a1a";
|
||||
this.size = [180, 120];
|
||||
}
|
||||
|
||||
ImageNode.title = "Image";
|
||||
ImageNode.desc = "Image/Texture Node";
|
||||
|
||||
ImageNode.prototype.onDrawBackground = function(ctx) {
|
||||
if (this.flags.collapsed) return;
|
||||
|
||||
// Draw texture info
|
||||
ctx.fillStyle = "#888";
|
||||
ctx.font = "10px monospace";
|
||||
const filename = this.properties.file ? this.properties.file.split('/').pop() : "No file";
|
||||
ctx.fillText(filename.substring(0, 20), 10, this.size[1] - 10);
|
||||
};
|
||||
|
||||
// Constant Color Node
|
||||
function ConstantColorNode() {
|
||||
this.addOutput("Color", "color3");
|
||||
|
||||
this.addProperty("color", [1, 1, 1], "vec3");
|
||||
this.widget = this.addWidget("color", "value", this.properties.color, (v) => {
|
||||
this.properties.color = v;
|
||||
});
|
||||
|
||||
this.color = "#FFC107";
|
||||
this.bgcolor = "#1a1a1a";
|
||||
this.size = [140, 60];
|
||||
}
|
||||
|
||||
ConstantColorNode.title = "Color";
|
||||
ConstantColorNode.desc = "Constant Color Value";
|
||||
|
||||
ConstantColorNode.prototype.onExecute = function() {
|
||||
this.setOutputData(0, this.properties.color);
|
||||
};
|
||||
|
||||
ConstantColorNode.prototype.onDrawBackground = function(ctx) {
|
||||
if (this.flags.collapsed) return;
|
||||
|
||||
// Draw color preview
|
||||
const c = this.properties.color;
|
||||
ctx.fillStyle = `rgb(${c[0] * 255}, ${c[1] * 255}, ${c[2] * 255})`;
|
||||
ctx.fillRect(10, 30, this.size[0] - 20, 20);
|
||||
};
|
||||
|
||||
// Constant Float Node
|
||||
function ConstantFloatNode() {
|
||||
this.addOutput("Value", "float");
|
||||
|
||||
this.addProperty("value", 0.5, "number");
|
||||
this.widget = this.addWidget("number", "value", this.properties.value, (v) => {
|
||||
this.properties.value = v;
|
||||
});
|
||||
|
||||
this.color = "#03A9F4";
|
||||
this.bgcolor = "#1a1a1a";
|
||||
this.size = [140, 50];
|
||||
}
|
||||
|
||||
ConstantFloatNode.title = "Float";
|
||||
ConstantFloatNode.desc = "Constant Float Value";
|
||||
|
||||
ConstantFloatNode.prototype.onExecute = function() {
|
||||
this.setOutputData(0, this.properties.value);
|
||||
};
|
||||
|
||||
// Material Output Node
|
||||
function MaterialOutputNode() {
|
||||
this.addInput("Surface", "surface");
|
||||
|
||||
this.properties = {};
|
||||
this.color = "#E91E63";
|
||||
this.bgcolor = "#1a1a1a";
|
||||
this.size = [140, 40];
|
||||
}
|
||||
|
||||
MaterialOutputNode.title = "Material Output";
|
||||
MaterialOutputNode.desc = "Final Material Output";
|
||||
|
||||
// Register custom node types
|
||||
export function registerMaterialXNodeTypes() {
|
||||
if (typeof LiteGraph === 'undefined') {
|
||||
console.error('Cannot register node types: LiteGraph not loaded');
|
||||
return false;
|
||||
}
|
||||
|
||||
LiteGraph.registerNodeType("materialx/openpbr_surface", OpenPBRSurfaceNode);
|
||||
LiteGraph.registerNodeType("materialx/image", ImageNode);
|
||||
LiteGraph.registerNodeType("materialx/constant_color", ConstantColorNode);
|
||||
LiteGraph.registerNodeType("materialx/constant_float", ConstantFloatNode);
|
||||
LiteGraph.registerNodeType("materialx/material_output", MaterialOutputNode);
|
||||
|
||||
console.log('Registered MaterialX node types');
|
||||
return true;
|
||||
}
|
||||
|
||||
// Create node graph from material data
|
||||
export function createNodeGraphFromMaterial(materialData) {
|
||||
if (!materialData) {
|
||||
console.error('No material data provided');
|
||||
return null;
|
||||
}
|
||||
|
||||
const graph = new LGraph();
|
||||
|
||||
// Determine material type
|
||||
const useOpenPBR = materialData.hasOpenPBR;
|
||||
const useUsdPreview = !useOpenPBR && materialData.hasUsdPreviewSurface;
|
||||
|
||||
if (!useOpenPBR && !useUsdPreview) {
|
||||
console.warn('Material has neither OpenPBR nor UsdPreviewSurface data');
|
||||
return graph;
|
||||
}
|
||||
|
||||
// Create material output node
|
||||
const outputNode = LiteGraph.createNode("materialx/material_output");
|
||||
outputNode.pos = [800, 200];
|
||||
graph.add(outputNode);
|
||||
|
||||
if (useOpenPBR) {
|
||||
return createOpenPBRGraph(graph, materialData, outputNode);
|
||||
} else {
|
||||
return createUsdPreviewSurfaceGraph(graph, materialData, outputNode);
|
||||
}
|
||||
}
|
||||
|
||||
// Create OpenPBR material node graph
|
||||
function createOpenPBRGraph(graph, materialData, outputNode) {
|
||||
const openPBR = materialData.openPBR;
|
||||
if (!openPBR) {
|
||||
console.error('No OpenPBR data in material');
|
||||
return graph;
|
||||
}
|
||||
|
||||
// Create OpenPBR surface shader node
|
||||
const shaderNode = LiteGraph.createNode("materialx/openpbr_surface");
|
||||
shaderNode.pos = [400, 50];
|
||||
graph.add(shaderNode);
|
||||
|
||||
// Connect shader to output
|
||||
shaderNode.connect(0, outputNode, 0);
|
||||
|
||||
let inputIndex = 0;
|
||||
let yOffset = 50;
|
||||
const xStart = 50;
|
||||
|
||||
// Helper function to create input nodes
|
||||
const createInputNode = (value, type, label, shaderInputIndex) => {
|
||||
let node;
|
||||
|
||||
if (type === 'color3') {
|
||||
// Check if there's a texture
|
||||
if (value && value.textureId !== undefined && value.textureId >= 0) {
|
||||
node = LiteGraph.createNode("materialx/image");
|
||||
node.properties.file = `texture_${value.textureId}`;
|
||||
node.title = `${label} Texture`;
|
||||
} else {
|
||||
node = LiteGraph.createNode("materialx/constant_color");
|
||||
const colorValue = value?.value || value || [1, 1, 1];
|
||||
node.properties.color = Array.isArray(colorValue) ? colorValue : [colorValue, colorValue, colorValue];
|
||||
node.title = label;
|
||||
}
|
||||
} else if (type === 'float') {
|
||||
// Check if there's a texture
|
||||
if (value && value.textureId !== undefined && value.textureId >= 0) {
|
||||
node = LiteGraph.createNode("materialx/image");
|
||||
node.properties.file = `texture_${value.textureId}`;
|
||||
node.title = `${label} Texture`;
|
||||
} else {
|
||||
node = LiteGraph.createNode("materialx/constant_float");
|
||||
node.properties.value = value?.value !== undefined ? value.value : (value !== undefined ? value : 0.5);
|
||||
node.title = label;
|
||||
}
|
||||
} else {
|
||||
return null;
|
||||
}
|
||||
|
||||
node.pos = [xStart, yOffset];
|
||||
yOffset += 80;
|
||||
graph.add(node);
|
||||
|
||||
// Connect to shader
|
||||
node.connect(0, shaderNode, shaderInputIndex);
|
||||
|
||||
return node;
|
||||
};
|
||||
|
||||
// Base layer
|
||||
if (openPBR.base) {
|
||||
createInputNode(openPBR.base.color, 'color3', 'Base Color', inputIndex++);
|
||||
createInputNode(openPBR.base.weight, 'float', 'Base Weight', inputIndex++);
|
||||
createInputNode(openPBR.base.metalness, 'float', 'Metalness', inputIndex++);
|
||||
createInputNode(openPBR.base.diffuse_roughness, 'float', 'Base Roughness', inputIndex++);
|
||||
}
|
||||
|
||||
// Specular layer
|
||||
if (openPBR.specular) {
|
||||
createInputNode(openPBR.specular.weight, 'float', 'Specular Weight', inputIndex++);
|
||||
createInputNode(openPBR.specular.color, 'color3', 'Specular Color', inputIndex++);
|
||||
createInputNode(openPBR.specular.roughness, 'float', 'Specular Roughness', inputIndex++);
|
||||
createInputNode(openPBR.specular.ior, 'float', 'Specular IOR', inputIndex++);
|
||||
createInputNode(openPBR.specular.anisotropy, 'float', 'Anisotropy', inputIndex++);
|
||||
}
|
||||
|
||||
// Transmission
|
||||
if (openPBR.transmission && openPBR.transmission.weight > 0) {
|
||||
createInputNode(openPBR.transmission.weight, 'float', 'Transmission Weight', inputIndex++);
|
||||
createInputNode(openPBR.transmission.color, 'color3', 'Transmission Color', inputIndex++);
|
||||
}
|
||||
|
||||
// Coat
|
||||
if (openPBR.coat && openPBR.coat.weight > 0) {
|
||||
createInputNode(openPBR.coat.weight, 'float', 'Coat Weight', inputIndex++);
|
||||
createInputNode(openPBR.coat.color, 'color3', 'Coat Color', inputIndex++);
|
||||
createInputNode(openPBR.coat.roughness, 'float', 'Coat Roughness', inputIndex++);
|
||||
createInputNode(openPBR.coat.ior, 'float', 'Coat IOR', inputIndex++);
|
||||
}
|
||||
|
||||
// Emission
|
||||
if (openPBR.emission && (openPBR.emission.luminance > 0 ||
|
||||
(openPBR.emission.color && (openPBR.emission.color[0] > 0 || openPBR.emission.color[1] > 0 || openPBR.emission.color[2] > 0)))) {
|
||||
createInputNode(openPBR.emission.color, 'color3', 'Emission Color', inputIndex++);
|
||||
createInputNode(openPBR.emission.luminance, 'float', 'Emission Luminance', inputIndex++);
|
||||
}
|
||||
|
||||
// Geometry
|
||||
if (openPBR.geometry) {
|
||||
if (openPBR.geometry.opacity !== undefined && openPBR.geometry.opacity < 1.0) {
|
||||
createInputNode(openPBR.geometry.opacity, 'float', 'Opacity', inputIndex++);
|
||||
}
|
||||
}
|
||||
|
||||
return graph;
|
||||
}
|
||||
|
||||
// Create UsdPreviewSurface material node graph
|
||||
function createUsdPreviewSurfaceGraph(graph, materialData, outputNode) {
|
||||
// Similar structure but for UsdPreviewSurface
|
||||
// Implementation simplified for brevity
|
||||
console.log('Creating UsdPreviewSurface graph (simplified)');
|
||||
|
||||
const shaderNode = LiteGraph.createNode("materialx/openpbr_surface");
|
||||
shaderNode.title = "UsdPreviewSurface";
|
||||
shaderNode.pos = [400, 200];
|
||||
graph.add(shaderNode);
|
||||
|
||||
shaderNode.connect(0, outputNode, 0);
|
||||
|
||||
return graph;
|
||||
}
|
||||
|
||||
// Show node graph panel
|
||||
export function showNodeGraph(materialData) {
|
||||
if (!materialData) {
|
||||
console.error('No material data to visualize');
|
||||
return;
|
||||
}
|
||||
|
||||
currentMaterialForGraph = materialData;
|
||||
|
||||
const wrapper = document.getElementById('node-graph-wrapper');
|
||||
const canvas = document.getElementById('node-graph-canvas');
|
||||
const title = document.getElementById('node-graph-title');
|
||||
|
||||
if (!wrapper || !canvas) {
|
||||
console.error('Node graph DOM elements not found');
|
||||
return;
|
||||
}
|
||||
|
||||
// Update title
|
||||
title.textContent = `MaterialX Node Graph - ${materialData.name || 'Material'}`;
|
||||
|
||||
// Show wrapper
|
||||
wrapper.classList.add('visible');
|
||||
|
||||
// Create or recreate graph
|
||||
nodeGraph = createNodeGraphFromMaterial(materialData);
|
||||
|
||||
if (!nodeGraph) {
|
||||
console.error('Failed to create node graph');
|
||||
return;
|
||||
}
|
||||
|
||||
// Create or update canvas
|
||||
if (nodeGraphCanvas) {
|
||||
nodeGraphCanvas.setGraph(nodeGraph);
|
||||
} else {
|
||||
nodeGraphCanvas = new LGraphCanvas(canvas, nodeGraph);
|
||||
nodeGraphCanvas.background_image = null;
|
||||
nodeGraphCanvas.clear_background = true;
|
||||
nodeGraphCanvas.render_shadows = true;
|
||||
nodeGraphCanvas.render_connections_shadows = false;
|
||||
nodeGraphCanvas.render_connection_arrows = true;
|
||||
|
||||
// Customize appearance
|
||||
nodeGraphCanvas.default_link_color = "#9FA8DA";
|
||||
nodeGraphCanvas.highquality_render = true;
|
||||
|
||||
// Handle zoom updates
|
||||
nodeGraphCanvas.onNodeSelected = function(node) {
|
||||
updateNodeGraphInfo();
|
||||
};
|
||||
}
|
||||
|
||||
// Start graph execution
|
||||
nodeGraph.start();
|
||||
|
||||
// Center and fit graph
|
||||
setTimeout(() => {
|
||||
centerNodeGraph();
|
||||
updateNodeGraphInfo();
|
||||
}, 100);
|
||||
|
||||
console.log('Node graph displayed');
|
||||
}
|
||||
|
||||
// Hide node graph panel
|
||||
export function hideNodeGraph() {
|
||||
const wrapper = document.getElementById('node-graph-wrapper');
|
||||
if (wrapper) {
|
||||
wrapper.classList.remove('visible');
|
||||
}
|
||||
|
||||
if (nodeGraph) {
|
||||
nodeGraph.stop();
|
||||
}
|
||||
}
|
||||
|
||||
// Toggle node graph visibility
|
||||
export function toggleNodeGraphVisibility() {
|
||||
const wrapper = document.getElementById('node-graph-wrapper');
|
||||
if (!wrapper) return;
|
||||
|
||||
if (wrapper.classList.contains('visible')) {
|
||||
hideNodeGraph();
|
||||
} else {
|
||||
// Show graph for currently selected material
|
||||
// Get selected material from global scope
|
||||
const selectedMaterial = window.selectedMaterialForExport;
|
||||
if (selectedMaterial && selectedMaterial.data) {
|
||||
showNodeGraph(selectedMaterial.data);
|
||||
} else {
|
||||
alert('Please select a material from the Materials panel first');
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Center node graph view
|
||||
export function centerNodeGraph() {
|
||||
if (!nodeGraphCanvas || !nodeGraph) return;
|
||||
|
||||
// Calculate bounds of all nodes
|
||||
const nodes = nodeGraph._nodes;
|
||||
if (!nodes || nodes.length === 0) return;
|
||||
|
||||
let minX = Infinity, minY = Infinity;
|
||||
let maxX = -Infinity, maxY = -Infinity;
|
||||
|
||||
for (const node of nodes) {
|
||||
minX = Math.min(minX, node.pos[0]);
|
||||
minY = Math.min(minY, node.pos[1]);
|
||||
maxX = Math.max(maxX, node.pos[0] + node.size[0]);
|
||||
maxY = Math.max(maxY, node.pos[1] + node.size[1]);
|
||||
}
|
||||
|
||||
const centerX = (minX + maxX) / 2;
|
||||
const centerY = (minY + maxY) / 2;
|
||||
const width = maxX - minX;
|
||||
const height = maxY - minY;
|
||||
|
||||
// Calculate zoom to fit
|
||||
const canvasWidth = nodeGraphCanvas.canvas.width;
|
||||
const canvasHeight = nodeGraphCanvas.canvas.height;
|
||||
const zoomX = canvasWidth / (width + 200);
|
||||
const zoomY = canvasHeight / (height + 200);
|
||||
const zoom = Math.min(zoomX, zoomY, 1.0); // Don't zoom in more than 1x
|
||||
|
||||
// Set camera
|
||||
nodeGraphCanvas.ds.scale = zoom;
|
||||
nodeGraphCanvas.ds.offset[0] = -centerX * zoom + canvasWidth / 2;
|
||||
nodeGraphCanvas.ds.offset[1] = -centerY * zoom + canvasHeight / 2;
|
||||
|
||||
nodeGraphCanvas.setDirty(true, true);
|
||||
updateNodeGraphInfo();
|
||||
}
|
||||
|
||||
// Update node graph info display
|
||||
function updateNodeGraphInfo() {
|
||||
if (!nodeGraph || !nodeGraphCanvas) return;
|
||||
|
||||
const zoomElem = document.getElementById('graph-zoom');
|
||||
const nodeCountElem = document.getElementById('graph-node-count');
|
||||
|
||||
if (zoomElem) {
|
||||
zoomElem.textContent = (nodeGraphCanvas.ds.scale * 100).toFixed(0) + '%';
|
||||
}
|
||||
|
||||
if (nodeCountElem) {
|
||||
nodeCountElem.textContent = nodeGraph._nodes.length;
|
||||
}
|
||||
}
|
||||
|
||||
// Export node graph as JSON
|
||||
export function exportNodeGraphAsJSON() {
|
||||
if (!nodeGraph) {
|
||||
console.error('No node graph to export');
|
||||
return;
|
||||
}
|
||||
|
||||
const graphData = nodeGraph.serialize();
|
||||
const jsonString = JSON.stringify(graphData, null, 2);
|
||||
|
||||
const blob = new Blob([jsonString], { type: 'application/json' });
|
||||
const url = URL.createObjectURL(blob);
|
||||
const link = document.createElement('a');
|
||||
link.href = url;
|
||||
link.download = `${currentMaterialForGraph?.name || 'material'}_graph.json`;
|
||||
document.body.appendChild(link);
|
||||
link.click();
|
||||
document.body.removeChild(link);
|
||||
URL.revokeObjectURL(url);
|
||||
|
||||
console.log('Node graph exported as JSON');
|
||||
}
|
||||
|
||||
// Make functions globally accessible
|
||||
if (typeof window !== 'undefined') {
|
||||
window.toggleNodeGraph = toggleNodeGraphVisibility;
|
||||
window.centerNodeGraph = centerNodeGraph;
|
||||
window.exportNodeGraphJSON = exportNodeGraphAsJSON;
|
||||
}
|
||||
Reference in New Issue
Block a user