Dear All,

I'm having some problems with depth peeling. I have previously implemented this before successfully on older hardware, but I cant get my new version to work. I used to simply call into tex2dproj with projective transformed vertexes, but the profile our engine uses with cg for w/e reason no longer supports tex2dproj, so I have to scale the texture vertexes into the required range myself. This seems to be working, but I am having a lot of trouble with the comparison, the results are very low precision. I almost never seem to get any rejection of fragments, unless I use a basis, then the results become very inaccurate.

Here is the code that scales the vertex positions into the range [0,1]

float4x4 ScaleTexture = float4x4(float4(.5,0,0,0),float4(0,.5,0,0),float4(0,0,1,0),float4(0,0,0,1));float4 finalposition = mul(ProjectionMatrix, pos);OUT.Position = finalposition;float4(((finalposition).xyz/(finalposition.w))+float3(1,1,0),1));projectedtex.y = 1 - projectedtex.y;OUT.TexCoord3 =  projectedtex;	

Pixel Shader

MRT_OUT OUT;   color.a = (IN.TexCoord3.z);   if(firstlayer > 0)   {             if( color.a <= tex2D(Texture2, (IN.TexCoord3.xy) ).r)//Depth peeling section      {         discard;      }       OUT.rt2 = color.a;   }   else   {     OUT.rt2 = float4(color.a,color.a,color.a,color.a);   }

I have checked in PIX and the R32 Texture being passed in as depth appears to be correct. Unfortunately I cant seem to debug the pixel shader(pix complains when I try and do this). Anything seem obviously wrong?

Regards,
Jesse

I am already writing out the depth to a 32 bit texture. I do not think depth accuracy is the issue here, since there is no Z-fighting, but I changed the clipping planes so that most of the scene was clipped out, and I still couldnt get it to work.
Jesse