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crate-writer-2025
tinyusdz/ANALYSIS_INDEX.md
Syoyo Fujita 0721c93534 Add light filter relationship support for USD light primitives 
Implement rel light:filters relationship support for all light types:
- Add lightFilters field to BoundableLight and NonboundableLight base classes
- Create AddLightFilterSpecs() function to export light filter relationships as separate relationship specs
- Handle all light types: SphereLight, RectLight, DiskLight, CylinderLight, DistantLight, DomeLight, GeometryLight, PortalLight
- Add comprehensive test for light filter roundtrip with RectLight
- Light filters enable professional lighting setups with shadow filtering and light linking

All 81 unit tests passing, including new light filter test.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
2025-11-20 00:23:54 +09:00

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TinyUSDZ Crate Writer - Analysis Documents Index

Overview

This directory contains a comprehensive analysis of the TinyUSDZ USD Crate (USDC) writer codebase, identifying high-priority enhancement opportunities and a roadmap for continued development.

Analysis Date: November 19, 2025
Current Status: 74 tests passing
Overall Completeness: 65-70%

Documents

1. CRATE_WRITER_ANALYSIS.md (15 KB)

Primary comprehensive analysis document

Detailed technical analysis of the crate writer implementation covering:

  • 10 major sections with in-depth coverage
  • Shader types and support status
  • Primitive types and their implementation status
  • Relationship features and gaps
  • Material/shader features analysis
  • Light types and advanced features
  • Animation and timesamples support
  • 10 high-priority enhancement opportunities with effort estimates
  • Recommended implementation sequence (immediate, short-term, medium-term)
  • Test coverage recommendations
  • File locations and change summary

Use this for: Deep technical understanding, implementation planning, design decisions

2. ENHANCEMENT_SUMMARY.txt (6 KB)

Quick reference guide

Executive summary covering:

  • Quick status overview of all features
  • Top 3 highest priority enhancements with details
  • Secondary priorities with effort estimates
  • Known limitations and low-priority issues
  • Recommended implementation order by release
  • File locations summary
  • Recent improvements timeline
  • Test coverage status

Use this for: Quick lookup, prioritization decisions, stakeholder communication

3. FEATURE_MATRIX.txt (7.2 KB)

Visual completeness matrix

Visual representation of feature coverage including:

  • Progress bars for all major features
  • Component-by-component breakdown
  • Overall completion percentages
  • Total feature count and statistics
  • Implementation confidence levels by tier
  • Easy vs. hard tasks classification

Use this for: Status overview, quick assessment, visual presentations

Key Findings Summary

Current Implementation Status

  • Shader System: 65% complete (4/8 types fully supported)
  • Light System: 75% complete (6/9 types fully supported)
  • Geometry System: 100% complete (all major types)
  • Composition System: 60% complete (5/8 arcs)
  • Material/Shading: 70% complete (core features done)
  • Animation: 80% complete (attribute timesamples working)

Top 3 High-Priority Enhancements

  1. Light Filter Support (HIGH Impact, MEDIUM Effort: 2-3 days)

    • Required for professional lighting setups
    • Add rel light:filters relationship type
    • Files: usdLux.hh

  2. NodeGraph Full Implementation (HIGH Impact, MEDIUM-HIGH Effort: 3-4 days)

    • Enable complex shader networks beyond simple chains
    • Add properties container and connectivity validation
    • Files: usdShade.hh, usdc-writer.cc

  3. Composition Arc Enhancements - Specializes (MEDIUM-HIGH Impact, MEDIUM Effort: 2-3 days)

    • Advanced scene organization patterns
    • Add specializes arc processing
    • Files: composition.hh, stage.hh

Complete Feature List Found

  • 4 fully supported shader types (UsdPreviewSurface, UsdUVTexture, UsdTransform2d, UsdPrimvarReader_*)
  • 6 fully supported light types (Sphere, Rect, Disk, Cylinder, Distant, Dome)
  • All major geometry types (Mesh, Curves, Points, Camera, Subsets)
  • 5 composition arcs (References, Payloads, Inherits, SubLayers, Over)
  • Comprehensive material binding (direct and collection-based)
  • Attribute and shader input timesamples

Missing/Incomplete Features

  • NodeGraph - Empty struct, needs full implementation
  • Light Filters - Not yet implemented
  • Math shader nodes - UsdAdd, UsdMultiply, UsdMix, etc.
  • Specializes - Not yet implemented
  • UsdRamp, UsdColorSpace - Not found in codebase
  • 3 light types - GeometryLight, PortalLight, PluginLight (partial/empty)

File Locations Reference

Feature Category Primary File Line Range Completeness
Shaders src/usdShade.hh 44-348 65%
Lights src/usdLux.hh 30-244 75%
Geometry src/usdGeom.hh 34-1100+ 100%
Composition src/composition.hh 30-150 60%
USDC Writer src/usdc-writer.cc/hh varies Growing
Crate Writer src/crate-writer.cc/hh varies Experimental

Recommended Reading Order

For Quick Assessment (10 minutes)

  1. This index (ANALYSIS_INDEX.md)
  2. ENHANCEMENT_SUMMARY.txt - "TOP 3 HIGHEST PRIORITY ENHANCEMENTS" section
  3. FEATURE_MATRIX.txt - Overall completion overview

For Implementation Planning (30-45 minutes)

  1. ENHANCEMENT_SUMMARY.txt - Full document
  2. CRATE_WRITER_ANALYSIS.md - Section 7 (High-Priority Opportunities)
  3. CRATE_WRITER_ANALYSIS.md - Section 8 (Recommended Next Steps)
  4. FEATURE_MATRIX.txt - Implementation Confidence Levels section

For Deep Technical Review (2+ hours)

  1. CRATE_WRITER_ANALYSIS.md - Complete document
  2. Review relevant source files at locations listed in each document
  3. FEATURE_MATRIX.txt - For visual reference

Test Coverage Status

Current: 74 tests passing
Recommended additions: 16 new tests (Tests 75-90)

Suggested new tests:

  • Tests 75-76: Light filters and GeometryLight properties
  • Tests 77-78: NodeGraph organization and composition
  • Test 79: Specialize arc composition
  • Tests 80-87: Additional shader nodes (UsdAdd, Multiply, Mix, etc.)
  • Tests 88-90: Other enhancements (PortalLight, variant integration, etc.)

Implementation Roadmap

Release N (Immediate: 1-2 weeks)

  • Light Filter Relationships
  • GeometryLight Full Properties

Release N+1 (Short-term: 2-4 weeks)

  • NodeGraph Full Implementation
  • Specialize Composition Arc
  • Initial Additional Shader Nodes

Release N+2 (Medium-term: 4-8 weeks)

  • Additional Shader Nodes (completion)
  • Variant Composition Integration
  • SDR Metadata Support

How to Use These Documents

For Developers

  1. Start with ENHANCEMENT_SUMMARY.txt for quick context
  2. Read relevant sections in CRATE_WRITER_ANALYSIS.md
  3. Use file locations to navigate source code
  4. Check FEATURE_MATRIX.txt for visual progress tracking

For Project Managers

  1. Review ENHANCEMENT_SUMMARY.txt - Top 3 priorities
  2. Check FEATURE_MATRIX.txt - Overall completion percentage
  3. Reference effort estimates in CRATE_WRITER_ANALYSIS.md Section 8
  4. Use test coverage recommendations for milestone planning

For Architects

  1. Read CRATE_WRITER_ANALYSIS.md completely
  2. Focus on Section 7 (High-Priority Opportunities)
  3. Review file locations in Section 10
  4. Consider implementation dependencies

Key Statistics

Metric Value
Total Features Analyzed 35
Fully Implemented 22 (63%)
Partially Implemented 5 (14%)
Not Implemented 8 (23%)
Current Tests 74
Recommended Tests 90
Overall Completion 65-70%

Document Maintenance

These documents were generated through comprehensive code analysis of:

  • 5 primary schema files (usdShade.hh, usdLux.hh, usdGeom.hh, composition.hh, prim-types.hh)
  • 2 writer implementation files (usdc-writer.cc, crate-writer.cc)
  • 50 recent git commits
  • TODO/FIXME annotations in source code

Last Updated: November 19, 2025
Repository: crate-writer-2025 branch
Base Commit: 3af0af81 (Implement comprehensive validation system enhancements)

Quick Navigation

Start Here:

  • New to project? → ENHANCEMENT_SUMMARY.txt
  • Need visual overview? → FEATURE_MATRIX.txt
  • Implementing features? → CRATE_WRITER_ANALYSIS.md Sections 7-8

Find Information About:

  • Specific shader type? → CRATE_WRITER_ANALYSIS.md Section 1
  • Light types? → CRATE_WRITER_ANALYSIS.md Section 5
  • Geometry support? → CRATE_WRITER_ANALYSIS.md Section 2
  • Composition arcs? → CRATE_WRITER_ANALYSIS.md Section 3
  • Material features? → CRATE_WRITER_ANALYSIS.md Section 4
  • Animation support? → CRATE_WRITER_ANALYSIS.md Section 6

Planning:

  • Next priorities? → ENHANCEMENT_SUMMARY.txt section "TOP 3 HIGHEST PRIORITY"
  • Implementation order? → ENHANCEMENT_SUMMARY.txt section "RECOMMENDED IMPLEMENTATION ORDER"
  • Testing? → CRATE_WRITER_ANALYSIS.md Section 9

Additional Resources

For more information about USD and TinyUSDZ:

Questions or Updates? Refer to the detailed analysis documents for specific features or implementation approaches.

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