Hi,
I am checking to see if the USD material UsdPreviewSurface specification is reflected.
I use UsdTransform2d to specify texture iterations, etc., but this does not seem to be reflected in the RTX rendering.
Below are the specifications for Transform2d.
https://graphics.pixar.com/usd/release/spec_usdpreviewsurface.html#transform2d
I have created a sample usda file.
UsdPreviewSurface_transform_test.zip (14.3 KB)
When UsdPreviewSurface_transform_test.zip is unzipped, it is extracted into a usda file and one texture.
The material was specified as follows.
def Material "texture_mat"
{
token inputs:frame:stPrimvarName = "st"
token outputs:surface.connect = </World/Looks/texture_mat/PBRShader.outputs:surface>
def Shader "PBRShader"
{
uniform token info:id = "UsdPreviewSurface"
color3f inputs:diffuseColor = (1, 1, 1)
color3f inputs:diffuseColor.connect = </World/Looks/texture_mat/diffuseTexture.outputs:rgb>
float inputs:metallic = 0
float inputs:roughness = 0.45599997
token outputs:surface
}
def Shader "stReader"
{
uniform token info:id = "UsdPrimvarReader_float2"
token inputs:varname.connect = </World/Looks/texture_mat.inputs:frame:stPrimvarName>
float2 outputs:result
}
def Shader "diffuseTexture"
{
uniform token info:id = "UsdUVTexture"
asset inputs:file = @./tile_image.png@
token inputs:sourceColorSpace = "sRGB" (
allowedTokens = ["auto", "raw", "sRGB"]
)
float2 inputs:st.connect = </World/Looks/texture_mat/transform2d.outputs:result>
token inputs:wrapS = "repeat"
token inputs:wrapT = "repeat"
float3 outputs:rgb
}
def Shader "transform2d"
{
uniform token info:id = "UsdTransform2d"
token inputs:in.connect = </World/Looks/texture_mat/stReader.outputs:result>
float inputs:rotation = 0
float2 inputs:scale = (1.5, 1.2)
float2 inputs:translation = (0.5, 0.2)
float2 outputs:result
}
}
RTX-Real-Time, RTX Interactive(Path Tracing) and Iray do not appear to reference transform2d in UsdPreviewSurface.
I believe this feature is often used, especially when passing shapes via Connector.
I have also confirmed that it can be reflected in Apple’s AR Quick Look.
Check Environment
- OS : Windows 10
- Omniverse Create 2022.2.1
Confirmation Procedure
- Unzip and open UsdPreviewSurface_transform_test.zip
I have specified transform2d on the right Cube, but it is not reflected.
Switch to Pixar Storm and you will see it reflected.