When I try to save the shader graph, I get an error that there is no `roughness`

Target Platforms XR
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1

When I try to save a shader graph, I get the following error
I do not have a ‘roughness’ parameter in the shader graph.
Does anyone know how to solve this problem?

[Worker0] KeyNotFoundException: The given key 'roughness' was not present in the dictionary.
System.Collections.Generic.Dictionary`2[TKey,TValue].get_Item (TKey key) (at <dcf6bec1c5764d29a37432d4b047f650>:0)
UnityEditor.ShaderGraph.MaterialX.MtlxNodeData.GetPort (System.String name) (at ./Library/PackageCache/com.unity.polyspatial@1.1.4/Editor/ShaderGraphConversion/System/MtlxGraphData.cs:190)
UnityEditor.ShaderGraph.MaterialX.ExternalEdgeMap.ResolveTypeConversions (UnityEditor.ShaderGraph.MaterialX.MtlxGraphData graph) (at ./Library/PackageCache/com.unity.polyspatial@1.1.4/Editor/ShaderGraphConversion/System/ExternalEdgeMap.cs:94)
UnityEditor.ShaderGraph.MaterialX.ExternalEdgeMap.ResolveExternals (UnityEditor.ShaderGraph.MaterialX.MtlxGraphData graph, System.Boolean flattenTypeConversions) (at ./Library/PackageCache/com.unity.polyspatial@1.1.4/Editor/ShaderGraphConversion/System/ExternalEdgeMap.cs:81)
UnityEditor.ShaderGraph.MaterialX.MtlxPostProcessor.ProcessGraph (UnityEditor.ShaderGraph.GraphData graphData, System.String filename, System.Boolean skipContext) (at ./Library/PackageCache/com.unity.polyspatial@1.1.4/Editor/ShaderGraphConversion/MtlxPostProcessor.cs:95)
UnityEditor.ShaderGraph.MaterialX.MtlxPostProcessor.ProcessFile (System.String assetPath, System.String dstRoot, System.String& filePathNoExtension) (at ./Library/PackageCache/com.unity.polyspatial@1.1.4/Editor/ShaderGraphConversion/MtlxPostProcessor.cs:74)
UnityEditor.ShaderGraph.MaterialX.MtlxPostProcessor.OnImportAsset (UnityEditor.AssetImporters.AssetImportContext context) (at ./Library/PackageCache/com.unity.polyspatial@1.1.4/Editor/ShaderGraphConversion/MtlxPostProcessor.cs:21)
Unity.PolySpatial.Internals.PolySpatialAssetImporter.OnImportAsset (UnityEditor.AssetImporters.AssetImportContext ctx) (at ./Library/PackageCache/com.unity.polyspatial@1.1.4/Editor/PolySpatialAssetImporter.cs:39)
UnityEditor.AssetImporters.ScriptedImporter.GenerateAssetData (UnityEditor.AssetImporters.AssetImportContext ctx) (at /Users/bokken/build/output/unity/unity/Modules/AssetPipelineEditor/Public/ScriptedImporter.cs:25)
2

I believe this error occurs when you have a “Smoothness” block (even if disabled) in a target that doesn’t support smoothness (such as an Unlit target). We have a fix for this issue in the pipeline, but in the meantime, I’d suggest disconnecting/removing the Smoothness block (you may have to set it to the default value of 0.5 to get it to disappear).

3

Thank you very much!
The bug was successfully fixed.
Am I correct in understanding that the ‘Smoothness’ in the shader graph is converted to ‘Roughness’ in MaterialX?

4

That’s correct. We target the RealityKit PBR Surface node for lit shader graphs. The conversion is just Roughness = 1.0 - Smoothness.