preview_surface.md

PreviewSurface

https://graphics.pixar.com/usd/docs/UsdPreviewSurface-Proposal.html

https://github.com/PixarAnimationStudios/USD/blob/release/pxr/usdImaging/plugin/usdShaders/shaders/shaderDefs.usda

Inputs

• diffuseColor - color3f - (0.18, 0.18, 0.18)
• emissiveColor - color3f - (0.0, 0.0, 0.0)
• useSpeclarWorkflow - int - 0
  • 1
    • specularColor - color3f - (0.0, 0.0, 0.0)
  • 0
    • metallic - float - 0.0
• roughness - float - 0.5
• clearcoat - float - 0.0
• clearcoatRoughness - float 0.01
• opacity - float - 1.0
• opacityThreshold - float - 0.0
• ior - float - 1.5
• normal - normal3f - (0.0, 0.0, 1.0)
• displacement - float - 0.0
• occlusion - float - 1.0

Outputs

• surface - token
• displacement - token

UsdUVTexture

Inputs

• file - asset - string
• st - float2 - (0.0, 0.0)
• wrapS - token - useMetadata
  • black, clamp, repeat, mirror,
• wrapT - token = useMetadata
• fallback - float4 - (0.0, 0.0, 0.0, 1.0)
• scale - float4 - (1.0, 1.0, 1.0, 1.0)
• bias - float4 - (0.0, 0.0, 0.0, 0.0)

Outputs

• r, g, b, a

UsdTransform2d

Inputs

• in - float2 - (0.0, 0.0)
• rotation - float - (0.0)
  • counter-clockwise rotation in degrees around the origin
• scale - float2 - (1.0, 1.0)
• translation - float2 (0.0, 0.0)

Outpuits

• result - float2

TODO

• Primvar Reader(arbitrary vertex attributes)
• displacement
• Texture transform