RECONSTRUCTION FILTERS FOR BUMP MAPPING
ABSTRACT
Textures that are magnified appears jagged, and therefore
reconstruction filters using linear or cubic interpolation
polynomials are often used to reduce aliasing. The same aliasing
problem is noticed for bump mapping, where it is often solved by
bilinear interpolation of the height map, in order to obtain
intermediate values. Low-pass filtering of the height map is not
suitable for the magnification problem since it will suppress the
bumps. It will be shown that reconstruction filters can be used to
interpolate gradients, rather than height values directly. The goal is to
produce non jagged bumps, without removing high frequency details by
low-pass filtering.
keywords: Bump Mapping, Antialiasing, Reconstruction filters