Bump Mapping

Another implementation



• DirectX 6 “environment-mapped bump mapping”
• Environment map texture stores global lighting
• Bump map stores Fu, Fv; used to perturb env map coords
  • Approximates E(N - Fu - Fv) with E(N) - Fu - Fv
  • Sphere map non-linear, so approximation suffers at edges
• 2x2 matrix transforms bump u, v to match env map
• Only supported by one device at time of writing

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