15-462 Lecture 13: Texture Mapping

03/14/2002

15-462 Graphics I

Bump Mapping

•How do you make a surface look rough?

–Option 1: model the surface with many small polygons

–Option 2: perturb the normal vectors before the shading calculation

•the surface doesn’t actually change, but shading makes it look that way

•bump map fakes small displacements above or below the true surface

•can use texture-mapping for this

•For the math behind it all look at Angel 9.4

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