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03-UnrealEngine/卡通渲染相关资料/渲染功能/其他渲染功能/Toon眉毛渲染.md
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03-UnrealEngine/卡通渲染相关资料/渲染功能/其他渲染功能/Toon眉毛渲染.md
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---
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title: Toon眉毛渲染
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date: 2023-12-08 17:48:07
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excerpt:
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tags:
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rating: ⭐
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---
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## 有关眉毛、表情需要使用 模板功能
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UTS使用模板
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![[08-Assets/Images/ImageBag/UrealEngineNPR/UTS表情.png]]
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![[08-Assets/Images/ImageBag/UrealEngineNPR/UTS表情_StencilOut.png]]
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![[08-Assets/Images/ImageBag/UrealEngineNPR/UTS表情_StencilMask.png]]
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```
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Stencil
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{
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Ref[_StencilNo] //设置渲染的模板缓存值，0~255
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Comp[_StencilComp] //模板测试的通过条件，有除了equal，还有Greater、Less、Always、Never等，类似ZTest。
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Pass[_StencilOpPass] //表示通过模板测试和Z测试（注意是都通过）的像素，怎么处置它的模板值。
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Fail[_StencilOpFail] //表示通过了模板测试但没通过Z测试的像素，怎么处置它的模板值。
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}
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_UTS_StencilMode mode = (_UTS_StencilMode)(material.GetInt(ShaderPropStencilMode));
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switch (mode)
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{
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case _UTS_StencilMode.Off:
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// material.SetInt(ShaderPropStencilNo,0);
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material.SetInt(ShaderPropStencilComp, (int)_StencilCompFunction.Disabled);
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material.SetInt(ShaderPropStencilOpPass, (int)_StencilOperation.Keep);
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material.SetInt(ShaderPropStencilOpFail, (int)_StencilOperation.Keep);
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break;
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case _UTS_StencilMode.StencilMask:
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// material.SetInt(ShaderPropStencilNo,0);
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material.SetInt(ShaderPropStencilComp, (int)_StencilCompFunction.Always);
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material.SetInt(ShaderPropStencilOpPass, (int)_StencilOperation.Replace);
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material.SetInt(ShaderPropStencilOpFail, (int)_StencilOperation.Replace);
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break;
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case _UTS_StencilMode.StencilOut:
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// material.SetInt(ShaderPropStencilNo,0);
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material.SetInt(ShaderPropStencilComp, (int)_StencilCompFunction.NotEqual);
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material.SetInt(ShaderPropStencilOpPass, (int)_StencilOperation.Keep);
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material.SetInt(ShaderPropStencilOpFail, (int)_StencilOperation.Keep);
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break;
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}
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```
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七大罪中使用使用了深度测试 Greater Equal.(默认是 less Equal)。但这个方式可能在UE4里不太行，因为UE4的深度测试是全局的？
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这个应该需要创建一个MeshProcessor来实现：
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```c#
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FSingleLayerWaterPassMeshProcessor::FSingleLayerWaterPassMeshProcessor(const FScene* Scene, const FSceneView* InViewIfDynamicMeshCommand, const FMeshPassProcessorRenderState& InPassDrawRenderState, FMeshPassDrawListContext* InDrawListContext)
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: FMeshPassProcessor(Scene, Scene->GetFeatureLevel(), InViewIfDynamicMeshCommand, InDrawListContext)
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, PassDrawRenderState(InPassDrawRenderState)
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{
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if (SingleLayerWaterUsesSimpleShading(Scene->GetShaderPlatform()))
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{
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// Force non opaque, pre multiplied alpha, transparent blend mode because water is going to be blended against scene color (no distortion from texture scene color).
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FRHIBlendState* ForwardSimpleWaterBlendState = TStaticBlendState<CW_RGBA, BO_Add, BF_One, BF_InverseSourceAlpha>::GetRHI();
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PassDrawRenderState.SetBlendState(ForwardSimpleWaterBlendState);
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}
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}
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//默认是CF_DepthNearOrEqual，做这个效果可能就要使用CF_DepthFartherOrEqual
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void SetupBasePassState(FExclusiveDepthStencil::Type BasePassDepthStencilAccess, const bool bShaderComplexity, FMeshPassProcessorRenderState& DrawRenderState)
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{
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DrawRenderState.SetDepthStencilAccess(BasePassDepthStencilAccess);
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if (bShaderComplexity)
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{
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// Additive blending when shader complexity viewmode is enabled.
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DrawRenderState.SetBlendState(TStaticBlendState<CW_RGBA, BO_Add, BF_One, BF_One, BO_Add, BF_Zero, BF_One>::GetRHI());
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// Disable depth writes as we have a full depth prepass.
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DrawRenderState.SetDepthStencilState(TStaticDepthStencilState<false, CF_DepthNearOrEqual>::GetRHI());
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}
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}
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```
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设置位置在于FXXXPassMeshProcessor::Process()中的SetDepthStencilStateForBasePass()中。需要bMaskedInEarlyPass为false，GetDepthStencilAccess为DepthRead。
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```c#
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const bool bMaskedInEarlyPass = (MaterialResource.IsMasked() || Mesh.bDitheredLODTransition) && MaskedInEarlyPass(GShaderPlatformForFeatureLevel[FeatureLevel]);
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if (bEnableReceiveDecalOutput)
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{
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// Set stencil value for this draw call
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// This is effectively extending the GBuffer using the stencil bits
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const uint8 StencilValue = GET_STENCIL_BIT_MASK(RECEIVE_DECAL, PrimitiveSceneProxy ? !!PrimitiveSceneProxy->ReceivesDecals() : 0x00)
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| STENCIL_LIGHTING_CHANNELS_MASK(PrimitiveSceneProxy ? PrimitiveSceneProxy->GetLightingChannelStencilValue() : 0x00);
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if (bMaskedInEarlyPass)
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{
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DrawRenderState.SetDepthStencilState(TStaticDepthStencilState<
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false, CF_Equal,
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true, CF_Always, SO_Keep, SO_Keep, SO_Replace,
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false, CF_Always, SO_Keep, SO_Keep, SO_Keep,
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0xFF, GET_STENCIL_BIT_MASK(RECEIVE_DECAL, 1) | STENCIL_LIGHTING_CHANNELS_MASK(0x7)
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>::GetRHI());
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DrawRenderState.SetStencilRef(StencilValue);
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}
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else if (DrawRenderState.GetDepthStencilAccess() & FExclusiveDepthStencil::DepthWrite)
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{
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DrawRenderState.SetDepthStencilState(TStaticDepthStencilState<
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true, CF_GreaterEqual,
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true, CF_Always, SO_Keep, SO_Keep, SO_Replace,
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false, CF_Always, SO_Keep, SO_Keep, SO_Keep,
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0xFF, GET_STENCIL_BIT_MASK(RECEIVE_DECAL, 1) | STENCIL_LIGHTING_CHANNELS_MASK(0x7)
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>::GetRHI());
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DrawRenderState.SetStencilRef(StencilValue);
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}
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else
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{
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DrawRenderState.SetDepthStencilState(TStaticDepthStencilState<
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false, CF_GreaterEqual,
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true, CF_Always, SO_Keep, SO_Keep, SO_Replace,
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false, CF_Always, SO_Keep, SO_Keep, SO_Keep,
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0xFF, GET_STENCIL_BIT_MASK(RECEIVE_DECAL, 1) | STENCIL_LIGHTING_CHANNELS_MASK(0x7)
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>::GetRHI());
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DrawRenderState.SetStencilRef(StencilValue);
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}
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}
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else if (bMaskedInEarlyPass)
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{
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DrawRenderState.SetDepthStencilState(TStaticDepthStencilState<false, CF_Equal>::GetRHI());
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}
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```
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