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The Bump terms simulates 3d effect using a texture to offset
pixels while rendering.
Scale : Scale of the bump effect
Texture : A normal map will be computed out of the texture with black areas flat and white with maximum bump effect applied.
Channel : the texture channel , current version implements only the TEX0 channel
Offset u,v : texture offset in U and V direction in normalized units
Scale u,v : texture scaling
Rotation : rotation of the texture image around up W axis