vault backup: 2024-12-17 10:55:22
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{"AI动捕优化思路：":{"AI动捕优化思路：":{"currentFile":{"count":1,"lastUpdated":1731243010285}}},"TODO清单":{"TODO清单":{"internalLink":{"count":1,"lastUpdated":1731553316709}}},"CustomThunk":{"CustomThunk":{"internalLink":{"count":1,"lastUpdated":1731555464503}}},"MobileTAA只做两帧混合":{"MobileTAA只做两帧混合":{"currentFile":{"count":1,"lastUpdated":1731557419798}}},"UMG组件作用笔记":{"UMG组件作用笔记":{"internalLink":{"count":1,"lastUpdated":1731557505574}}},"SequoiaCamShotEvalTemplate":{"SequoiaCamShotEvalTemplate":{"currentFile":{"count":1,"lastUpdated":1732609264076}}},"c++内存泄漏分析工具":{"c++内存泄漏分析工具":{"internalLink":{"count":1,"lastUpdated":1733137754779}}},"Lights":{"Lights":{"currentFile":{"count":1,"lastUpdated":1733637911876}}}}
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{"SequoiaCamShotEvalTemplate":{"SequoiaCamShotEvalTemplate":{"currentFile":{"count":1,"lastUpdated":1732609264076}}},"c++内存泄漏分析工具":{"c++内存泄漏分析工具":{"internalLink":{"count":1,"lastUpdated":1733137754779}}},"Lights":{"Lights":{"currentFile":{"count":1,"lastUpdated":1733637911876}}},"FShadowProjectionNoTransformVS（ShadowProjectionNoTransformVS）、FShadowVolumeBoundProjectionVS（ShadowVolumeBoundProjectionVS）":{"FShadowProjectionNoTransformVS（ShadowProjectionNoTransformVS）、FShadowVolumeBoundProjectionVS（ShadowVolumeBoundProjectionVS）":{"currentFile":{"count":1,"lastUpdated":1734345863513}}}}
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@ -15,7 +15,12 @@
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- [x] 恢复灯牌显影功能
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- [x] 帮助跃洋在动画蓝图中使用骨骼缩放的方式制作JiaRan、NaiLin2套衣服的长款版本；并且修改资产名称，解决相关资产的上传问题。
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- [x] 添加水晶石场景道具。
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- [ ] 4周年相关工作
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- [x] 4周年相关工作
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- [x] 解决王志 4周年舞台 反射球问题。
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- [x] 帮罗导添加2个才艺的VJ，更换一个才艺中所有角色为轻量版角色。
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- [ ]
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# 12.16~12.20
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- [x] 帮助朱雨辰解决：
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- [x] 4周年角色不能完全变黑问题。
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- [x] 渲片时的天空球问题切换天空盒问题。
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@ -901,6 +901,119 @@ void FDeferredShadingSceneRenderer::RenderDeferredShadowProjections(
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RenderShadowProjections():
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1. 取得当前FVisibleLightInfo、FLightSceneProxy；创建FProjectedShadowInfoArray DistanceFieldShadows、NormalShadows。
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2. 遍历VisibleLightInfo.ShadowsToProject，按照阴影特征将每个FProjectedShadowInfo加入DistanceFieldShadows、NormalShadows。
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3. 调用Lambda RenderNormalShadows()来渲染ScreenShadowMaskTexture与ScreenShadowMaskSubPixelTexture。
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4. 遍历DistanceFieldShadows，调用FProjectedShadowInfo->RenderRayTracedDistanceFieldProjection()来渲染距离场阴影。
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### FSceneRenderer::RenderShadowProjections()
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```c++
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void FSceneRenderer::RenderShadowProjections(
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FRDGBuilder& GraphBuilder,
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FRDGTextureRef OutputTexture,
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const FMinimalSceneTextures& SceneTextures,
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const FLightSceneProxy* LightSceneProxy,
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TArrayView<const FProjectedShadowInfo* const> Shadows,
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bool bSubPixelShadow,
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bool bProjectingForForwardShading)
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{
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CheckShadowDepthRenderCompleted();
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for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ViewIndex++)
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{
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const FViewInfo& View = Views[ViewIndex];
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const FExclusiveDepthStencil ExclusiveDepthStencil = FExclusiveDepthStencil::DepthRead_StencilWrite;
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if (bSubPixelShadow && !HairStrands::HasViewHairStrandsData(View))
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{
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continue;
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}
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View.BeginRenderView();
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// Sanity check
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if (bSubPixelShadow)
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{
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check(View.HairStrandsViewData.VisibilityData.HairOnlyDepthTexture);
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}
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FShadowProjectionPassParameters CommonPassParameters;
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CommonPassParameters.SceneTextures = SceneTextures.GetSceneTextureShaderParameters(View.FeatureLevel);
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CommonPassParameters.HairStrands = HairStrands::BindHairStrandsViewUniformParameters(View);
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if (Strata::IsStrataEnabled())
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{
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CommonPassParameters.Strata = Strata::BindStrataGlobalUniformParameters(View);
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}
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CommonPassParameters.RenderTargets[0] = FRenderTargetBinding(OutputTexture, ERenderTargetLoadAction::ELoad);
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CommonPassParameters.RenderTargets.DepthStencil =
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bSubPixelShadow ?
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FDepthStencilBinding(View.HairStrandsViewData.VisibilityData.HairOnlyDepthTexture, ERenderTargetLoadAction::ELoad, ERenderTargetLoadAction::ELoad, ExclusiveDepthStencil) :
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FDepthStencilBinding(SceneTextures.Depth.Target, ERenderTargetLoadAction::ELoad, ERenderTargetLoadAction::ELoad, ExclusiveDepthStencil);
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RDG_GPU_MASK_SCOPE(GraphBuilder, View.GPUMask);
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RDG_EVENT_SCOPE_CONDITIONAL(GraphBuilder, Views.Num() > 1, "View%d", ViewIndex);
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// Project the shadow depth buffers onto the scene.
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for (const FProjectedShadowInfo* ProjectedShadowInfo : Shadows)
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{
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if (ProjectedShadowInfo->bAllocated)
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{
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// Only project the shadow if it's large enough in this particular view (split screen, etc... may have shadows that are large in one view but irrelevantly small in others)
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if (ProjectedShadowInfo->FadeAlphas[ViewIndex] > 1.0f / 256.0f)
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{
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if (ProjectedShadowInfo->bOnePassPointLightShadow)
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{
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ProjectedShadowInfo->RenderOnePassPointLightProjection(GraphBuilder, CommonPassParameters, ViewIndex, View, LightSceneProxy, bProjectingForForwardShading, bSubPixelShadow);
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}
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else
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{
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ProjectedShadowInfo->RenderProjection(GraphBuilder, CommonPassParameters, ViewIndex, &View, LightSceneProxy, this, bProjectingForForwardShading, bSubPixelShadow);
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}
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}
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}
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}
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}
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}
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```
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### Shader
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投射阴影渲染用Shader为：
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- ShadowProjectionVertexShader.usf
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- FShadowProjectionNoTransformVS：直接输出顶点坐标。
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- FShadowVolumeBoundProjectionVS：
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- ShadowProjectionPixelShader.usf
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- TShadowProjectionPS
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- TShadowProjectionFromTranslucencyPS
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- TDirectionalPercentageCloserShadowProjectionPS
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- TModulatedShadowProjection
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PS. 向往Blog： 以上可知，对ScreenShadowMaskTexture执行绘制时，是在屏幕空间进行的，并且ScreenShadowMask会被叠加多次（视光源的阴影实例个数而定），不同的通道存储了不同类型的阴影信息。
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## RenderLight()
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```c++
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// Render the light to the scene color buffer, conditionally using the attenuation buffer or a 1x1 white texture as input
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if (bDirectLighting)
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{
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for (int32 ViewIndex = 0, ViewCount = Views.Num(); ViewIndex < ViewCount; ++ViewIndex)
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{
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const FViewInfo& View = Views[ViewIndex];
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// If the light elided the screen space shadow mask, sample directly from the packed shadow mask
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int32 VirtualShadowMapId = INDEX_NONE;
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if (bElideScreenShadowMask)
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{
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INC_DWORD_STAT(STAT_VSMLocalProjectionOnePassFast);
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VirtualShadowMapId = VisibleLightInfo.GetVirtualShadowMapId(&View);
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}
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RDG_EVENT_SCOPE_CONDITIONAL(GraphBuilder, ViewCount > 1, "View%d", ViewIndex);
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SCOPED_GPU_MASK(GraphBuilder.RHICmdList, View.GPUMask);
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RenderLight(GraphBuilder, Scene, View, SceneTextures, &LightSceneInfo, VirtualShadowMapId != INDEX_NONE ? nullptr : ScreenShadowMaskTexture, LightingChannelsTexture, false /*bRenderOverlap*/, true /*bCloudShadow*/, VirtualShadowMapArray.GetUniformBuffer(), ShadowSceneRenderer->VirtualShadowMapMaskBits, VirtualShadowMapId);
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}
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}
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```
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使用ScreenShadowMaskTexture来渲染阴影。
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# 半程阴影
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由晨风&Neverwind提出：
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