Patent ID: 6226005
Filing Date: 2001-05-01
Classification: G06T

Abstract:
A method of producing an illumination map for at least one object in a scene to be rendered, the object to be texture mapped and the object being represented as a mesh of polygons, comprising the steps of:(i) selecting a texture picture to be mapped to said object and representing said texture picture and said mesh of polygons in a common coordinate system;(ii) determining the location of, area of and weight of the intersection between each pixel in said texture map and each polygon in said polygon mesh, the weight corresponding to the proportion of said area of intersection relative to the total area of said pixel;(iii) for each determined area of intersection, determining the product of illumination information at said determined location of intersection and the weight of said area of intersection;(iv) summing each product determined in step (iii) for each respective pixel to obtain an illumination value; and(v) storing said illumination value for each said pixel.