From 6a24cc4470cfa24896162f0473543df5d66bc8d3 Mon Sep 17 00:00:00 2001
From: BlueRose <378100977@qq.com>
Date: Thu, 19 Dec 2024 15:13:04 +0800
Subject: [PATCH] vault backup: 2024-12-19 15:13:04

---
 .../various-complements/histories.json        |  2 +-
 .../RenderingPipeline/Lighting/Shadow.md      | 23 +++++++++++++++++++
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/.obsidian/plugins/various-complements/histories.json b/.obsidian/plugins/various-complements/histories.json
index 4c6818d..0e6b9ae 100644
--- a/.obsidian/plugins/various-complements/histories.json
+++ b/.obsidian/plugins/various-complements/histories.json
@@ -1 +1 @@
-{"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}}},"DecodeLightAttenuation":{"DecodeLightAttenuation":{"currentFile":{"count":1,"lastUpdated":1734406452310}}}}
\ No newline at end of file
+{"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}}},"DecodeLightAttenuation":{"DecodeLightAttenuation":{"currentFile":{"count":1,"lastUpdated":1734406452310}}},"clamped":{"clamped":{"currentFile":{"count":1,"lastUpdated":1734590559877}}}}
\ No newline at end of file
diff --git a/03-UnrealEngine/Rendering/RenderingPipeline/Lighting/Shadow.md b/03-UnrealEngine/Rendering/RenderingPipeline/Lighting/Shadow.md
index 7e6ec60..1259292 100644
--- a/03-UnrealEngine/Rendering/RenderingPipeline/Lighting/Shadow.md
+++ b/03-UnrealEngine/Rendering/RenderingPipeline/Lighting/Shadow.md
@@ -436,6 +436,29 @@ bool FShadowDepthPassMeshProcessor::TryAddMeshBatch(const FMeshBatch& RESTRICT M
 }
 ```
 
+## ShaderDepthBias
+相关计算位于FProjectedShadowInfo::UpdateShaderDepthBias()。
+起效条件：勾选Dynamic Inset Shadow
+CMD: CVarPerObjectDirectionalShadowDepthBias => r.Shadow.PerObjectDirectionalDepthBias 
+```c++
+// per object shadows (the whole-scene are taken care of above)
+if(bDirectionalLight)
+{
+	// we use CSMShadowDepthBias cvar but this is per object shadows, maybe we want to use different settings
+
+	// the z range is adjusted to we need to adjust here as well
+	DepthBias = CVarPerObjectDirectionalShadowDepthBias.GetValueOnRenderThread() / (MaxSubjectZ - MinSubjectZ);
+
+	float WorldSpaceTexelScale = ShadowBounds.W / FMath::Max(ResolutionX, ResolutionY);
+
+	DepthBias *= WorldSpaceTexelScale;
+	DepthBias *= 0.5f;	// avg GetUserShadowBias, in that case we don't want this adjustable
+
+	SlopeScaleDepthBias = CVarPerObjectDirectionalShadowSlopeScaleDepthBias.GetValueOnRenderThread();
+	SlopeScaleDepthBias *= LightSceneInfo->Proxy->GetUserShadowSlopeBias();
+}
+```
+
 ## Shader
 VertexShader为：ShadowDepthVertexShader.usf，有4种变体：
 - IMPLEMENT_SHADOW_DEPTH_SHADERMODE_SHADERS(VertexShadowDepth_PerspectiveCorrect);