hi all
having some issues with my normal mapping. when I change the lighting angle, the normal mapping changes properly, but when i just rotate the object, the normal mapping is incorrect. somehow, the object's transformation matrix isn't being considered properly, so that the mapping stays on the same place on the object as it's rotated ('shadows' should point the same direction, not rotate with the object)
here's the hlsl where the problems come from:
vertex shader snippet:
float3 vecWorldToLight = normalize ( vecLightWorldPosition - vecWorldPosition );
float3x3 TBNMatrix = float3x3 ( vTangent, vBinormal, vNormal );
Out.oVecLight = normalize ( mul ( TBNMatrix, vecWorldToLight ) );
pixel shader snippet:
float3 vecNormalMap = 2.0f * tex2D ( samp1, In.oT1 ).rgb - 1.0f;
float fDiffuse = saturate ( dot ( vecNormalMap, In.oVecLight ) );
any ideas?
-programmer_tom
