   rendering color different with and without vertex shaders
  Any ideas why, while rendering with dx9 and non programmable T&L my lit and textured model is brighter than the same model (same material and light model implemented in vs)rendered with dx9+vertex shaders (Cg)?It is strange because when I compare lit but non-textured models they look exactly the same with and without using the vertex shader.Any thoughts will be greatly appreciated! 
  I know that the way the final render looks varies from pixel and vertex shader version to version, so I''d bet that you''d using Cg has something to do with it.  Maybe you are missing something that the dx fixed pipeline has done that you haven''t.  Otherwise, it could be just that they look a little different in the end. ;  Perhaps the material of your model and the color of your light source both have ambient components.  The fixed function pipeline takes care of this but you could have easily omitted it in your shader.As far as the fixed function pipeline creating different results than the programmable pipeline, I don''t think that''s the case, at least on DX9 hardware.  I say this because DX9 class hardware basically takes the fixed function settings and creates shaders inside the driver anyway.  The results should be identical, as long as your shaders execute the same steps as the fixed function pipeline.neneboricua 