#usda 1.0
(
    doc = "Multiple objects with different OpenPBR materials and textures"
    metersPerUnit = 1
    upAxis = "Y"
    defaultPrim = "World"
)

def Xform "World"
{
    def Sphere "BrickSphere" (
        prepend apiSchemas = ["MaterialBindingAPI"]
    )
    {
        double radius = 0.8
        double3 xformOp:translate = (-3, 0, 0)
        uniform token[] xformOpOrder = ["xformOp:translate"]
        rel material:binding = </World/_materials/BrickMaterial>
    }

    def Cube "MetalCube" (
        prepend apiSchemas = ["MaterialBindingAPI"]
    )
    {
        double size = 1.5
        double3 xformOp:translate = (0, 0, 0)
        uniform token[] xformOpOrder = ["xformOp:translate"]
        rel material:binding = </World/_materials/MetalMaterial>

        texCoord2f[] primvars:st = [
            (0, 0), (1, 0), (1, 1), (0, 1),
            (0, 0), (1, 0), (1, 1), (0, 1),
            (0, 0), (1, 0), (1, 1), (0, 1),
            (0, 0), (1, 0), (1, 1), (0, 1),
            (0, 0), (1, 0), (1, 1), (0, 1),
            (0, 0), (1, 0), (1, 1), (0, 1)
        ] (
            interpolation = "faceVarying"
        )
    }

    def Sphere "GlassSphere" (
        prepend apiSchemas = ["MaterialBindingAPI"]
    )
    {
        double radius = 0.9
        double3 xformOp:translate = (3, 0, 0)
        uniform token[] xformOpOrder = ["xformOp:translate"]
        rel material:binding = </World/_materials/GlassMaterial>
    }

    def Mesh "GroundPlane" (
        prepend apiSchemas = ["MaterialBindingAPI"]
    )
    {
        int[] faceVertexCounts = [4]
        int[] faceVertexIndices = [0, 1, 2, 3]
        point3f[] points = [(-10, -2, -10), (10, -2, -10), (10, -2, 10), (-10, -2, 10)]
        texCoord2f[] primvars:st = [(0, 0), (5, 0), (5, 5), (0, 5)] (
            interpolation = "vertex"
        )
        rel material:binding = </World/_materials/CheckerMaterial>
    }

    def Scope "_materials"
    {
        def Material "BrickMaterial"
        {
            token outputs:surface.connect = </World/_materials/BrickMaterial/OpenPBRSurface.outputs:surface>

            def Shader "OpenPBRSurface"
            {
                uniform token info:id = "OpenPBRSurface"
                color3f inputs:base_color.connect = </World/_materials/BrickMaterial/BrickTexture.outputs:rgb>
                float inputs:base_metalness = 0.0
                float inputs:base_weight = 1.0
                float inputs:specular_roughness = 0.8
                token outputs:surface
            }

            def Shader "BrickTexture"
            {
                uniform token info:id = "UsdUVTexture"
                asset inputs:file = @./textures/brick.bmp@
                float2 inputs:texcoord.connect = </World/_materials/BrickMaterial/Primvar.outputs:result>
                color3f outputs:rgb
            }

            def Shader "Primvar"
            {
                uniform token info:id = "UsdPrimvarReader_float2"
                int inputs:index = 0
                float2 outputs:result
            }
        }

        def Material "MetalMaterial"
        {
            token outputs:surface.connect = </World/_materials/MetalMaterial/OpenPBRSurface.outputs:surface>

            def Shader "OpenPBRSurface"
            {
                uniform token info:id = "OpenPBRSurface"
                color3f inputs:base_color = (0.9, 0.85, 0.7)
                float inputs:base_metalness = 0.95
                float inputs:base_weight = 1.0
                float inputs:specular_roughness = 0.15
                token outputs:surface
            }
        }

        def Material "GlassMaterial"
        {
            token outputs:surface.connect = </World/_materials/GlassMaterial/OpenPBRSurface.outputs:surface>

            def Shader "OpenPBRSurface"
            {
                uniform token info:id = "OpenPBRSurface"
                color3f inputs:base_color = (1.0, 1.0, 1.0)
                float inputs:base_weight = 0.0
                float inputs:specular_roughness = 0.0
                float inputs:specular_weight = 1.0
                color3f inputs:transmission_color = (0.95, 0.98, 1.0)
                float inputs:transmission_weight = 0.95
                token outputs:surface
            }
        }

        def Material "CheckerMaterial"
        {
            token outputs:surface.connect = </World/_materials/CheckerMaterial/OpenPBRSurface.outputs:surface>

            def Shader "OpenPBRSurface"
            {
                uniform token info:id = "OpenPBRSurface"
                color3f inputs:base_color.connect = </World/_materials/CheckerMaterial/CheckerTexture.outputs:rgb>
                float inputs:base_metalness = 0.0
                float inputs:base_weight = 1.0
                float inputs:specular_roughness = 0.6
                token outputs:surface
            }

            def Shader "CheckerTexture"
            {
                uniform token info:id = "UsdUVTexture"
                asset inputs:file = @./textures/checkerboard.png@
                float2 inputs:texcoord.connect = </World/_materials/CheckerMaterial/Primvar.outputs:result>
                color3f outputs:rgb
            }

            def Shader "Primvar"
            {
                uniform token info:id = "UsdPrimvarReader_float2"
                int inputs:index = 0
                float2 outputs:result
            }
        }
    }
}