初始化

Shaders/Private/DeformationCS.usf

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+// DeformationCS.usf
+#include "/Engine/Public/Platform.ush"
+// 输入输出定义
+Texture2D<float4> InputTexture;
+RWTexture2D<float4> OutputTexture;
+// 参数缓冲区
+cbuffer Parameters
+{
+	float3 ImpactPoint;
+	float ImpactForce;
+	float3 ImpactNormal;
+	float DeformationRadius;
+	float Plasticity;
+	int3 TextureSize;
+	int3 UpdateRegionMin;
+	int3 UpdateRegionSize;
+};
+// 线程组大小
+#define THREADGROUP_SIZE_X 8
+#define THREADGROUP_SIZE_Y 8
+[numthreads(THREADGROUP_SIZE_X, THREADGROUP_SIZE_Y, 1)]
+void MainCS(
+	uint3 GroupID : SV_GroupID,
+	uint3 GroupThreadID : SV_GroupThreadID,
+	uint3 DispatchThreadID : SV_DispatchThreadID
+)
+{
+	// 计算全局像素坐标
+	int2 PixelCoord = DispatchThreadID.xy + int2(UpdateRegionMin.xy);
+    
+	// 检查是否在有效区域内
+	if (PixelCoord.x >= UpdateRegionMin.x + UpdateRegionSize.x || 
+		PixelCoord.y >= UpdateRegionMin.y + UpdateRegionSize.y)
+	{
+		return;
+	}
+    
+	// 从输入纹理读取位置
+	float4 OriginalPos = InputTexture.Load(int3(PixelCoord, 0));
+    
+	// 计算到碰撞点的距离
+	float dist = distance(OriginalPos.xyz, ImpactPoint);
+    
+	// 在变形半径内处理
+	if (dist < DeformationRadius)
+	{
+		// 计算变形衰减 (高斯衰减)
+		float falloff = exp(-(dist * dist) / (2.0 * DeformationRadius * DeformationRadius));
+        
+		// 计算变形量 (考虑法线方向)
+		float3 deformation = ImpactNormal * ImpactForce * falloff * 0.01;
+        
+		// 应用塑性变形
+		float3 newPos = OriginalPos.xyz + deformation * Plasticity;
+        
+		// 写入新位置
+		OutputTexture[PixelCoord] = float4(newPos, OriginalPos.w);
+	}
+	else
+	{
+		// 保持原位置
+		OutputTexture[PixelCoord] = OriginalPos;
+	}
+}