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texCoord( texX, texY, texZ , texW ) means texture coordinate after transforming from the texture matrix [ position goes through world, view, projection, and texture ] . We can use texCoord to fetch texture: 1. float4 color = tex2D( sampler, float2( texX / texW, texY/texW ); 2. float4 color = tex2Dporj( sampler, float4( texX, texY, texZ, texW ) ); The top-two methods will have the same result. Because tex2Dproj operator supports divide w in its interface. http://www.gamedev.net/community/forums/topic.asp?topic_id=408894 http://bbs.gameres.com/showthread.asp?threadid=104316
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