Recording medium which stores 3D image processing programm, 3D image processor, 3D image processing method, and video game machine

The present invention combines patches (or objects) while preventing the generation of clearance. The program execution section 400 is comprised of the vertex coordinate setting section 401 for setting the vertex coordinates of each polygon constituting the first and second patches, the combining vertex selection section 402 for selecting the vertexes of the combining target polygons from the first and second patches, and the vertex coordinate change section for matching the vertex coordinates of the first patch side and the vertex coordinates of the second patch side for the vertex coordinates of the selected polygons.