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Combining Vertex Fragment and Surface shaders


I have a working Vertex Fragment shader that allows 2 textures for the front and back of a mesh(Quad).

The problem is that it doesn't react to lighting. I have another very simple Surface shader that reacts to diffuse lighting. So how do I combine the 2?

In my Vertex Fragment shader I am using the VFACE semantic as an additional argument in my Fragment or Pixel shader function to check which side is currently facing the camera.

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