COMPUTER GRAPHICS BUMP MAPPING METHOD AND DEVICE

摘要

In computer graphics the image of a surface patch is computed, including specular reflections (mirror-like reflections) from the surface patch. A bump map is used to perturb the normal to a surface, so as to simulate bumps on the surface, which cause specular reflection highlights. The bump map assigns a perturbation vector to each point on several different surface patches and the same perturbation is applied to corresponding points on different surface patches, irrespective of orientation and shape differences between the surface patches. Preferably, the perturbation vector is always parallel to the viewscreen direction, irrespective of the direction of the normal that is being perturbed.