调试计算形变的shader，执行了，但是初始贴图数据就不对。
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zhangqing
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@@ -53,6 +53,7 @@ void MainCompute( // 注意: 建议使用 MainCompute，如果 C++ 注册的是
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{
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// 虽然我们调度时已经只调度了需要的区域，但为了安全起见，保留检查。
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// 理论上，如果 C++ 端调度正确，这个检查应该很少触发。
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OutputTexture[PixelCoord] = float4(100,100,100,100);
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return;
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}
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@@ -1,90 +0,0 @@
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// DeformationCS.usf
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#include "/Engine/Public/Platform.ush"
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// -----------------------------------------------------------------------------
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// 1. 输入输出定义
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// -----------------------------------------------------------------------------
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// 必须与 C++ 的 SHADER_PARAMETER_RDG_TEXTURE_SRV 匹配
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Texture2D<float4> InputTexture;
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// 必须与 C++ 的 SHADER_PARAMETER_RDG_TEXTURE_UAV 匹配
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RWTexture2D<float4> OutputTexture;
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// -----------------------------------------------------------------------------
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// 2. 参数缓冲区 (必须与 C++ FParameters 结构体严格匹配)
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// -----------------------------------------------------------------------------
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cbuffer Parameters
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{
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float3 ImpactPoint;
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float ImpactForce;
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float3 ImpactNormal;
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float DeformationRadius;
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float Plasticity;
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int3 TextureSize;
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// 修正后的参数：对应 C++ 的 FIntVector4 UpdateRegionParam
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// 分量顺序: (Min.X, Min.Y, Max.X, Max.Y)
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int4 UpdateRegionParam;
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};
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// -----------------------------------------------------------------------------
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// 3. 线程组大小和入口点
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// -----------------------------------------------------------------------------
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#define THREADGROUP_SIZE_X 8
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#define THREADGROUP_SIZE_Y 8
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[numthreads(THREADGROUP_SIZE_X, THREADGROUP_SIZE_Y, 1)]
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void MainCompute( // 注意: 建议使用 MainCompute，如果 C++ 注册的是 MainCompute
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uint3 GroupID : SV_GroupID,
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uint3 GroupThreadID : SV_GroupThreadID,
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uint3 DispatchThreadID : SV_DispatchThreadID // 全局线程 ID
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)
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{
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// -------------------------------------------------------------------------
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// 4. 坐标计算与边界检查
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// -------------------------------------------------------------------------
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// DispatchThreadID 从 0 开始，代表在调度区域内的偏移量。
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// 我们将其加上 UpdateRegionParam.xy (Min.X, Min.Y) 得到全局像素坐标。
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int2 PixelCoord = DispatchThreadID.xy + int2(UpdateRegionParam.x, UpdateRegionParam.y);
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// 边界检查：检查是否超出 UpdateRegionParam.zw (Max.X, Max.Y)
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if (PixelCoord.x < UpdateRegionParam.x || PixelCoord.x >= UpdateRegionParam.z ||
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PixelCoord.y < UpdateRegionParam.y || PixelCoord.y >= UpdateRegionParam.w)
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{
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// 虽然我们调度时已经只调度了需要的区域，但为了安全起见，保留检查。
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// 理论上，如果 C++ 端调度正确，这个检查应该很少触发。
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return;
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}
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// -------------------------------------------------------------------------
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// 5. 变形计算逻辑 (与之前相同)
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// -------------------------------------------------------------------------
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// 从输入纹理读取位置
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// Load 需要 int3，第三个分量 (MipLevel) 设为 0
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float4 OriginalPos = InputTexture.Load(int3(PixelCoord, 0));
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// 计算到碰撞点的距离
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float dist = distance(OriginalPos.xyz, ImpactPoint);
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// 在变形半径内处理
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if (dist < DeformationRadius)
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{
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// 计算变形衰减 (高斯衰减)
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float falloff = exp(-(dist * dist) / (2.0 * DeformationRadius * DeformationRadius));
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// 计算变形量 (考虑法线方向)
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float3 deformation = ImpactNormal * ImpactForce * falloff * 0.01;
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// 应用塑性变形
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float3 newPos = OriginalPos.xyz + deformation * Plasticity;
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// 写入新位置
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OutputTexture[PixelCoord] = float4(newPos, OriginalPos.w);
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}
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else
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{
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// 保持原位置
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OutputTexture[PixelCoord] = OriginalPos;
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}
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}
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@@ -153,7 +153,7 @@ void AIronBlock::InitializePositionTexture()
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LocalBounds.Min.Z // 假设初始是一个平面
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);
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InitialData[Index] = FLinearColor(LocalPos.X, LocalPos.Y, LocalPos.Z, 1.0f);
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InitialData[Index] = FLinearColor(LocalPos.X * 1000, LocalPos.Y * 1000, LocalPos.Z * 1000, 1.0f);
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}
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}
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@@ -197,7 +197,7 @@ void AIronBlock::InitializePositionTexture()
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}
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// 设置变形材质
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SetupDeformationMaterial();
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SetupDeformationMaterial(TempTexture);
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UE_LOG(LogTemp, Log, TEXT("Position textures initialized"));
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}
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@@ -229,7 +229,7 @@ void AIronBlock::CalculateLocalBounds()
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}
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}
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void AIronBlock::SetupDeformationMaterial()
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void AIronBlock::SetupDeformationMaterial(UTexture2D* OrigTex)
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{
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// 创建动态材质实例
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if (StaticMeshComp)
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@@ -250,7 +250,8 @@ void AIronBlock::SetupDeformationMaterial()
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if (DynMaterial)
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{
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// 初始时读取 RT0
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DynMaterial->SetTextureParameterValue(TEXT("PositionTexture"), PositionRenderTarget0);
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DynMaterial->SetTextureParameterValue(TEXT("PositionTexture"), OrigTex);
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//DynMaterial->SetTextureParameterValue(TEXT("PositionTexture"), PositionRenderTarget0);
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DynMaterial->SetVectorParameterValue(TEXT("LocalBoundsMin"), FLinearColor(LocalBounds.Min));
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DynMaterial->SetVectorParameterValue(TEXT("LocalBoundsMax"), FLinearColor(LocalBounds.Max));
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DynMaterial->SetScalarParameterValue(TEXT("DeformationStrength"), 1.0f);
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@@ -281,7 +282,8 @@ void AIronBlock::OnHammerHit(const FHitResult& HitResult)
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FVector ImpactNormal = HitResult.ImpactNormal;
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FVector LocalImpactPoint = GetTransform().InverseTransformPosition(ImpactPoint);
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FVector LocalImpactNormal = GetTransform().InverseTransformVector(ImpactNormal);
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UE_LOG(LogTemp,Display,TEXT("[AIronBlock::OnHammerHit] ImpactForce:%f,ImpactPoint:%s,ImpactNormal:%s,LocalImpactPoint:%s,LocalImpactNormal:%s")
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,ImpactForce,*ImpactPoint.ToString(),*ImpactNormal.ToString(),*LocalImpactPoint.ToString(),*LocalImpactNormal.ToString());
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UpdateComputeShaderParams(LocalImpactPoint, LocalImpactNormal, ImpactForce);
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ExecuteDeformationCS();
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@@ -311,6 +313,8 @@ void AIronBlock::UpdateComputeShaderParams(FVector LocalImpactPoint, FVector Loc
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// 切换纹理缓冲索引
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CurrentTextureIndex = 1 - CurrentTextureIndex;
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UE_LOG(LogTemp,Display,TEXT("[AIronBlock::OnHammerHitUpdateComputeShaderParams]CurrentImpactForce:%f, CurrentImpactPoint:%s,CurrentImpactNormal:%s,CurrentDeformationRadius:%f,CurrentPlasticity:%f")
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,CurrentImpactForce,*CurrentImpactPoint.ToString(),*CurrentImpactNormal.ToString(),CurrentDeformationRadius,CurrentPlasticity);
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}
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void AIronBlock::ExecuteDeformationCS()
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@@ -343,9 +347,24 @@ void AIronBlock::ExecuteDeformationCS()
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(CurrentImpactPoint.X - LocalBounds.Min.X) / LocalBounds.GetSize().X,
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(CurrentImpactPoint.Y - LocalBounds.Min.Y) / LocalBounds.GetSize().Y
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);
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UE_LOG(LogTemp,Display,TEXT("[AIronBlock::ExecuteDeformationCS]LocalBounds:%s")
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,*LocalBounds.ToString());
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// 假设 LocalBounds 仍然是未缩放的原始包围盒
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// 获得 Actor 的缩放
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FVector ComponentScale = StaticMeshComp->GetComponentScale();
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// 1. 计算缩放后包围盒的最大延伸 (在 X/Y 平面上)
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// 假设您的形变发生在 XY 平面
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float MaxLocalExtentX = LocalBounds.GetExtent().X * ComponentScale.X;
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float MaxLocalExtentY = LocalBounds.GetExtent().Y * ComponentScale.Y;
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float MaxScaledExtent = FMath::Max(MaxLocalExtentX, MaxLocalExtentY);
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// 2. 使用这个缩放后的最大延伸进行比例计算
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// 这里的 CurrentDeformationRadius 应该是一个世界空间的值。
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const float RadiusRatio = CurrentDeformationRadius / MaxScaledExtent;
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// 计算更新区域 (只更新受影响部分)
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const float RadiusRatio = CurrentDeformationRadius / LocalBounds.GetExtent().GetMax();
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//const float RadiusRatio = CurrentDeformationRadius / LocalBounds.GetExtent().GetMax();
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FIntRect UpdateRegion;
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UpdateRegion.Min.X = FMath::Clamp(FMath::FloorToInt((ImpactUV.X - RadiusRatio) * TexSize), 0, TexSize - 1);
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UpdateRegion.Min.Y = FMath::Clamp(FMath::FloorToInt((ImpactUV.Y - RadiusRatio) * TexSize), 0, TexSize - 1);
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@@ -356,6 +375,12 @@ void AIronBlock::ExecuteDeformationCS()
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if (UpdateRegion.Min.X >= UpdateRegion.Max.X) UpdateRegion.Max.X = UpdateRegion.Min.X + 1;
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if (UpdateRegion.Min.Y >= UpdateRegion.Max.Y) UpdateRegion.Max.Y = UpdateRegion.Min.Y + 1;
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// 临时代码，先更新全部区域
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UpdateRegion.Min.X = 0;
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UpdateRegion.Min.Y = 0;
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UpdateRegion.Max.X = TexSize;
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UpdateRegion.Max.Y = TexSize;
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// --- 关键修改：使用 RDG ---
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ENQUEUE_RENDER_COMMAND(ExecuteDeformationCS_RDG)(
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[
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@@ -394,6 +419,9 @@ void AIronBlock::ExecuteDeformationCS()
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Params->Plasticity = CurrentPlasticity;
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Params->UpdateRegionParam = FIntVector4(UpdateRegion.Min.X, UpdateRegion.Min.Y, UpdateRegion.Max.X, UpdateRegion.Max.Y);
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Params->TextureSize = FIntVector(TexSize, TexSize, 1);
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UE_LOG(LogTemp,Display,TEXT("[AIronBlock::ExecuteDeformationCS]ImpactForce:%f, ImpactPoint:%s,ImpactNormal:%s,DeformationRadius:%f,Plasticity:%f,UpdateRegion:%s")
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,Params->ImpactForce,*Params->ImpactPoint.ToString(),*Params->ImpactNormal.ToString(),Params->DeformationRadius,Params->Plasticity,*Params->UpdateRegionParam.ToString());
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// 5. ✨ 魔法发生的地方：RDG 为我们创建 SRV 和 UAV
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// 这就是解决你 nullptr 问题的核心
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@@ -54,7 +54,7 @@ protected:
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void GetStaticMeshVertexPositions(TArray<FVector3f>& OutPositions);
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/** 设置动态材质实例和参数 */
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void SetupDeformationMaterial();
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void SetupDeformationMaterial(UTexture2D* OrigTex);
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/** 安全地获取 RenderTarget 的 RHI 资源 */
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FTextureRHIRef GetRenderTargetRHI(UTextureRenderTarget2D* RT);
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