FORMATION OF DRAWING DATA FOR COMPUTER GRAPHICS

PURPOSE:To make reality and high-speed processing compatible and to prepare two-dimensional drawing data for computer graphics to be generally used by executing the polygonal division of three-dimensional picture data with a prescribed dividing number at first, defining the data as luminance information with ray tracing, executing luminance interpolation and defining the information as the drawing data. CONSTITUTION:At first, three-dimensional data are divided into a polygon, namely, to a polygon by the given dividing number automatically or according to the interaction format. Then, the apex luminance of the respective divided polygonal surfaces is successively calculated by the ray tracing. For an obtained polygon 200, the luminance correction is executed to the respective polygonal surfaces by the luminance interpolation and smooth shading is executed to the internal part of the polygon by using the apex luminance to be obtained by Z buffer method. Then, the luminance of the surface, where slanting lines are drawn, like a hexagonal pillar 300 is calculated by an interpolating method. Thus, the drawing data of the high reality can be obtained even by the high- speed processing.