I'm currently trying to create some shaders..now i started with a shader, which renders the 3d things into a texture and applies a pixel shader on this texture. The part of rendering everything into a texture works (I'm using ATI RenderMonkey for all this), but i can't Get back the texture on screen. I tried to use a "ScreenAlignedQuad" as a surface for the texture; But the screen will remain black.. Shader: float4x4 view_proj_matrix; float fInverseViewportWidth; float fInverseViewportHeight; float fViewportWidth; float fViewportHeight; struct VS_OUTPUT { float4 Pos: POSITION; float2 texCoord: TEXCOORD0; }; VS_OUTPUT vs_main(float4 Pos: POSITION) { VS_OUTPUT Out; Out.Pos = float4(Pos.xy, 0, 1); Out.texCoord.x = 0.5 * (1 + Pos.x - fInverseViewportWidth); Out.texCoord.y = 0.5 * (1 - Pos.y - fInverseViewportHeight); return Out; } sampler Texture; float4 ps_main(float2 texCoord: TEXCOORD0) : COLOR { return tex2D(Texture, texCoord); }