   [DX9] Color overlay on textured mesh
  I was just wondering, what would be a good way to render a textured mesh with a slight color overlay? I would like to visualize picked objects in a scene by having them turn into a shade of red. Many thanks for any help !   
  per-vertex colors?   ;  Well I was hoping there would be a solution on a renderstate level. Right now I'm switching to a purely red light whenever it is a picked mesh that is being rendered and it looks ok but if the texture is dark it is hard to notice the difference.   ;  If you're using the fixed function pipeline, there should be a material colour you can use.   ;  If fixed function, the texture factor (D3DRS_TEXTUREFACTOR) is convenient for a temporary colour. You can use a 'blend' op with its alpha to apply it only a little.Though if you're using fixed function, I'd suggest moving to pixel shaders, because they're simpler and more flexible.   