DuDv map


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What is a DuDv Map?
DuDv is a simple way to distort the pixels of a reflection map, similar to the way a parallax map distorts a surface, except DuDv doesn't take the viewing angle into consideration (no parallax) it just uses the DuDv map to shift the pixels of the reflection map before it's applied onto the mesh. The method is basically fetching Du and Dv from a texture, then adding Du to U and Dv to V for every pixel, offsetting the reflection map pixels.

A DuDv map is similar to a Normal Map in that it stores directional information in a texture, so the bitmap has a strange greenish-purplish look.

For more information, do an internet search for Environment Mapped Bump Mapping.


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