3D model drawing data creation method, apparatus, 3D video game apparatus, and readable recording medium on which 3D model drawing data creation program is recorded

摘要

PROBLEM TO BE SOLVED: To quickly form a drawn image for a game from a three-dimensional (3D) envelope model. SOLUTION: The envelope model is provided with a plurality of polygons having apexes related to an adjacent skeleton, and in compliance with a drawing cycle, a game character image is formed from data for each frame about a series of motion. A 3D model drawing image data forming device is provided with a three-dimensional multiplication processing part 121 calculating a product of a matrix and three- dimensional coordinates and a CPU 6. By means of the CPU 6, as to a certain apex in one polygon in formation of the game character image in an optional frame, a product of a matrix, which represents a specific gravity value showing a related degree with each skeleton, a converted matrix of the apex into a world coordinate system in the frame, and an inversed matrix from the world coordinate system of the apex in a reference frame is found for each of the related skeletons, while a matrix of the added products and the world coordinates of the apex in the reference frame are introduced to the three-dimensional multiplication processing part. In this way, the world coordinates in an optional frame are found in the apex.