Patent ID: 6188409
Filing Date: 2001-02-13
Classification: G06T

Abstract:
A device for presenting 3D graphics comprising:means for defining one or more polygons for objects to be presented,means for environment mapping, which comprises means for storing texture map and means for fetching the texture map information from the texture map storing means, means for bump mapping, which comprises means for storing a bump map and means for fetching the bump map from the bump map storing means, and means for defining a direction vector of bump map normal at each vertex of a polygon, means for modifying texture map coordinates based on the said bump map information by adding the bump map information as a 2D displacement to the texture map coordinates, and means for rasterizing images on a display device,characterized in that the device comprises further means for interpolating the bump map direction vectors by using the bump map direction values at vertices of the converging polygons for producing an angle value which is used to rotate the direction vector of the bump map to reduce annoying artifacts on the areas where the converging polygons meet on the object surfaces.