Question

我创建了一个渲染纹理，可以使用来自UE编辑器的视图菜单来对其进行可视化。当前，纹理是单一纯色。我想使用虚幻着色器以像素深度填充纹理。我知道深度缓冲区已经存在，但是此练习将帮助我了解UE中的整个着色器管道。有没有一种方法可以将着色器中的深度值转储到纹理上？我有以下顶点着色器。

struct FTriangleIDPassVSToPS
 {
     float4 Position : SV_POSITION;
 };

 #define FTriangleIDPassVSOutput FTriangleIDPassVSToPS
 void MainVS(FVertexFactoryInput Input,
     out FTriangleIDPassVSOutput Output
 #if USE_GLOBAL_CLIP_PLANE
     , out float OutGlobalClipPlaneDistance : SV_ClipDistance
 #endif
 )
 {
     ResolvedView = ResolveView();

     FVertexFactoryIntermediates VFIntermediates = GetVertexFactoryIntermediates(Input);
     float4 WorldPos = VertexFactoryGetWorldPosition(Input, VFIntermediates);

     float3x3 TangentToLocal = VertexFactoryGetTangentToLocal(Input, VFIntermediates);
     FMaterialVertexParameters VertexParameters = GetMaterialVertexParameters(Input, VFIntermediates, WorldPos.xyz, TangentToLocal);

     // Isolate instructions used for world position offset
     // As these cause the optimizer to generate different position calculating instructions in each pass, resulting in self-z-fighting.
     // This is only necessary for shaders used in passes that have depth testing enabled.
     ISOLATE
     {
         WorldPos.xyz += GetMaterialWorldPositionOffset(VertexParameters);
     }

     ISOLATE
     {
         float4 RasterizedWorldPosition = VertexFactoryGetRasterizedWorldPosition(Input, VFIntermediates, WorldPos);
     #if ODS_CAPTURE
         float3 ODS = OffsetODS(RasterizedWorldPosition.xyz, ResolvedView.TranslatedWorldCameraOrigin.xyz, ResolvedView.StereoIPD);
         Output.Position = INVARIANT(mul(float4(RasterizedWorldPosition.xyz + ODS, 1.0), ResolvedView.TranslatedWorldToClip));
     #else
         Output.Position = INVARIANT(mul(RasterizedWorldPosition, ResolvedView.TranslatedWorldToClip));
     #endif
     }
 }

了解“输出”给出顶点的裁剪空间位置。在像素着色器中，我应该这样做吗？

 void MainPS(FTriangleIDPassVSToPS Output, out uint OutColor : SV_Target0)
 {
     OutColor = Output.Position.z / Output.Position.w;
 }

当我可视化渲染纹理时，它没有给出预期的结果。您能指出正确的做法吗？谢谢

使用虚幻着色器的像素深度

0 个答案: