【OpenUSD】USD入門 その１：概要とデータ構造についてまとめる

#usda 1.0

def Xform "hello"
{
    def Sphere "world"
    {
        float3[] extent = [(-2, -2, -2), (2, 2, 2)]
        color3f[] primvars:displayColor = [(0, 0, 1)]
        double radius = 2
    }
}

#usda 1.0

def Xform "hello"
{
    def Sphere "world"
    {
        float3[] extent = [(-2, -2, -2), (2, 2, 2)]
        color3f[] primvars:displayColor = [(0, 0, 1)]
        double radius = 2

        rel material:binding = </hello/mat/blue>
    }

    def Scope "mat"
    {
        def Material "blue"
        {
        }
    }
}

#usda 1.0
(
    subLayers = [
        @shotFX.usd@,
        @shotAnimationBake.usd@,
        @sequence.usd@
    ]
)

#usda 1.0

class Xform "_class_Tree"
{
    def Mesh "Trunk"
    {
        color3f[] primvars:displayColor = [(.8, .8, .2)]
    }

    def Mesh "Leaves"
    {
        color3f[] primvars:displayColor = [(0, 1, 0)]
    }
}

def "TreeA" (
    inherits = </_class_Tree>
)
{
    over "Leaves"
    {
        color3f[] primvars:displayColor = [(0.8, 1, 0)]
    }
}

#usda 1.0

def Xform "hello" (
    variants = {
        string shadingVariant = "green"
    }
    prepend variantSets = "shadingVariant"
)
{
    def Sphere "world"
    {
    }
    variantSet "shadingVariant" = {
        "blue" {
            over "world"
            {
                color3f[] primvars:displayColor = [(0, 0, 1)]
            }

        }
        "green" {
            over "world"
            {
                color3f[] primvars:displayColor = [(0, 1, 0)]
            }

        }
        "red" {
            over "world"
            {
                color3f[] primvars:displayColor = [(1, 0, 0)]
            }

        }
    }
}

#usda 1.0
(
    relocates = {
        </CharANewVersion/Clothing> : </CharACurrent/TestClothing>,
        </EnvA/Trees> : </AlternateEnv/ParkA/Trees>
    }
)

def "Car"
{
    references = @CarAsset.usda@
    payload = @CarGeom.usda@
}

#usda 1.0

def Xform "Robot"
{
    def Scope "Materials"
    {
        def Material "Metal"
        {
            # Interface inputs drive shader parameters of the encapsulated
            # network. We are not showing the connections, nor how we encode
            # that the child Shader "Surface" is the primary output for the
            # material.
            float inputs:diffuseGain = 0
            float inputs:specularRoughness = 0

            def Shader "Surface"
            {
                asset info:id = @PxrSurface@
            }
        }

        def Material "CorrodedMetal" (
            specializes = </Robot/Materials/Metal>
        )
        {
            # specialize roughness...
            float inputs:specularRoughness = 0.2

            # Adding a pattern to drive Surface bump
            def Shader "Corrosion"
            {
                asset info:id = @PxrOSL@
                vector3f outputs:disp
            }

            over "Surface"
            {
                # Override that would connect specularBump to Corrosion
                # pattern's "outputs:disp" attribute
            }
        }
    }
}

#usda 1.0

def Xform "World"
{
    def Xform "Characters"
    {
        def "Rosie" (
            references = @./Robot.usd@</Robot>
        )
        {
            over "Materials"
            {
                over "Metal"
                {
                     float inputs:diffuseGain = 0.3
                     float inputs:specularRoughness = 0.1
                }
            }
        }
    }
}