vault backup: 2024-03-13 17:48:15

03-UnrealEngine/卡通渲染相关资料/渲染功能/ShaderModel/GBuffer&Material&BasePass.md

@@ -287,6 +287,59 @@ LazyPrintf.PushParam(!bEnableExecutionFlow ? *GenerateFunctionCode(MP_CustomData
 - `for (uint32 CustomUVIndex = 0; CustomUVIndex < NumUserTexCoords; CustomUVIndex++)`
 - `for (UMaterialExpressionVertexInterpolator* Interpolator : CustomVertexInterpolators`
 
+### 添加ToonDataAssetID 与 ToonOutlineDataAssetID笔记
+1. FMaterialRenderProxy::UpdateDeferredCachedUniformExpressions()
+2. FMaterialRenderProxy::EvaluateUniformExpressions()
+3. FUniformExpressionSet::FillUniformBuffer()
+4. EvaluatePreshader()
+5. EvaluateParameter()
+6. Context.MaterialRenderProxy->GetParameterValue()
+
+可以看得出关键数据在UniformExpressionSet中，这里的ParameterIndex则通过`EvaluateParameter(Stack, UniformExpressionSet, ReadPreshaderValue<uint16>(Data), Context);`进行计算。
+```c++
+const FMaterialNumericParameterInfo& Parameter = UniformExpressionSet->GetNumericParameter(ParameterIndex);
+bool bFoundParameter = false;
+
+// First allow proxy the chance to override parameter
+if (Context.MaterialRenderProxy)
+{
+	FMaterialParameterValue ParameterValue;
+	if (Context.MaterialRenderProxy->GetParameterValue(Parameter.ParameterType, Parameter.ParameterInfo, ParameterValue, Context))
+	{
+		Stack.PushValue(ParameterValue.AsShaderValue());
+		bFoundParameter = true;
+	}
+}
+
+bool FMaterialInstanceResource::GetParameterValue(EMaterialParameterType Type, const FHashedMaterialParameterInfo& ParameterInfo, FMaterialParameterValue& OutValue, const FMaterialRenderContext& Context) const
+{
+	checkSlow(IsInParallelRenderingThread());
+
+	bool bResult = false;
+
+	// Check for hard-coded parameters
+	if (Type == EMaterialParameterType::Scalar && ParameterInfo.Name == GetSubsurfaceProfileParameterName())
+	{
+		check(ParameterInfo.Association == EMaterialParameterAssociation::GlobalParameter);
+		const USubsurfaceProfile* MySubsurfaceProfileRT = GetSubsurfaceProfileRT();
+		OutValue = GetSubsurfaceProfileId(MySubsurfaceProfileRT);
+		bResult = true;
+	}
+	else if (Type == EMaterialParameterType::Scalar && NumSpecularProfileRT() > 0)
+	{
+		for (uint32 It=0,Count=NumSpecularProfileRT();It<Count;++It)
+		{
+			if (ParameterInfo.Name == SpecularProfileAtlas::GetSpecularProfileParameterName(GetSpecularProfileRT(It)))
+			{
+				check(ParameterInfo.Association == EMaterialParameterAssociation::GlobalParameter);
+				OutValue = SpecularProfileAtlas::GetSpecularProfileId(GetSpecularProfileRT(It));
+				bResult = true;
+				break;
+			}
+		}
+	}
+```
+
 ### 是否需要Toon
 在材质中：
 ```c++