That would work great. How would I implement this in a shader? I'm currently using the pre-made bumpmapping shader, so ideally I'd like to modify that to do what I want rather than creating it from scratch.
It appears that I need to change the vertex shader to retrieve the texture coordinates. In the prefab shader I don't have access to that though, since the actual .fx file only contains the pixel shader and the vertex shader is '#include'd into it. I've tried finding the included file but was unable to find it.
Could I use a new pass to change the texture coordinates before the currently existing pass?
I'm absolutely new to shaders, so code examples with comments would be much appreciated.