I have a parallax shader that works on my ATI system with my Direct X. It will only show gray cubes on my NVIDIA system. I must be doing something incorrect, because the shader works on both systems if I build a test app in DBP. Can anyone shed some light on this for me? here is the shader. //-------------------------------- // Parallax mapping //-------------------------------- // By Evolved // http://www.vector3r.com/ //-------------------------------- //----------------- // un-tweaks //----------------- matrix WorldVP:WorldViewProjection; matrix World:World; matrix ViewInv:ViewInverse; //----------------- // tweaks //----------------- float4 LightPosition = {150.0f, 150.0f, 0.0f, 1.0f}; float4 LightColor = {1.0f, 1.0f, 1.0f, 1.0f}; float LightRange = 2000.0f; float4 Ambient = {0.2f, 0.2f, 0.2f, 1.0f}; float SpecularPow = 32.0f; float Heightvec = 0.03; float BiasHeight = 0.1; float U = 1.0f; float V = 1.0f; //----------------- // Texture //----------------- texture BaseTX < string Name=""; >; sampler2D Base = sampler_state { texture = <BaseTX>; }; texture NormalTX < string Name=""; >; sampler2D Normal = sampler_state { texture = <NormalTX>; }; texture HeightTX < string Name=""; >; sampler2D Height = sampler_state { texture = <HeightTX>; }; //----------------- // structs //----------------- struct input { float4 Pos:POSITION; float2 UV:TEXCOORD; float3 Normal:NORMAL; float3 Tangent:TANGENT; float3 Binormal:BINORMAL; }; struct output { float4 OPos:POSITION; float2 Tex:TEXCOORD0; float3 LightVec:TEXCOORD1; float3 Attenuation:TEXCOORD2; float3 ViewVec:TEXCOORD3; }; //----------------- // vertex shader //----------------- output VS(input IN) { output OUT; OUT.OPos=mul(IN.Pos,WorldVP); OUT.Tex=IN.UV*float2(U,V); float3 WNor=mul(IN.Normal,World); WNor=normalize(WNor); float3 Wtan=mul(IN.Tangent,World); Wtan=normalize(Wtan); float3 Wbin=mul(IN.Binormal,World); Wbin=normalize(Wbin); float3 WPos=mul(IN.Pos,World); float3x3 TBN={Wtan,Wbin,WNor}; TBN=transpose(TBN); float3 LightPos=LightPosition-WPos; float3 ViewPos=ViewInv[3].xyz-WPos; OUT.LightVec=mul(LightPos,TBN); OUT.Attenuation=-LightPos/LightRange; OUT.ViewVec=mul(ViewPos,TBN); return OUT; } //----------------- // pixel shader //----------------- float4 PS(output IN) : COLOR { float3 View=normalize(IN.ViewVec); float HeightTex=tex2D(Height,IN.Tex).x+BiasHeight; float2 NewUv=(Heightvec*HeightTex-0.02)*View+IN.Tex; float4 Texture=tex2D(Base,NewUv); float3 NormalMap=tex2D(Normal,NewUv)*2-1; NormalMap=normalize(NormalMap); float3 LightV=normalize(IN.LightVec); float Normal=saturate(dot(NormalMap,LightV)); float Specular=saturate(dot(reflect(-View,NormalMap),LightV)); Specular=pow(Specular,SpecularPow); float4 DiffuseLight=1-dot(IN.Attenuation,IN.Attenuation); float4 Light=saturate(DiffuseLight*LightColor); return Texture*(((Normal+Specular)*Light)+Ambient); } //----------------- // techniques //----------------- technique Parallax { pass p1 { vertexShader = compile vs_2_0 VS(); pixelShader = compile ps_2_0 PS(); } } I cant find the link how to do the code tags...can a someone point me to the correct link so I can fix this? Thank you.