Polygon data converter, three-dimensional simulator and polygon data conversion method

摘要

It is an object of the invention to provide a polygon data convertor capable of effectively utilizing hardware incapable of plotting a back polygon, etc., a three-dimensional simulator, and so forth. A coordinated inversion portion (410) executes right-and-left inversion processing of apex coordinates of an input polygon on the basis of a right-and-left inversion flag and an up-and-down inversion flag. A back-and-front judgement portion (408) examines allocation sequence of the apex number and judges the back and the front of the input polygon. An allocation sequence replacement portion (42) replaces the allocation sequence on the basis of an exclusive OR of the back judgement flag, the right-and-left inversion flag and the up-and-down inversion flag, and an apex number allocation portion (422) allocates the apex number of the original input polygon to the divided polygons in accordance with the allocation sequence so replaced. The apex coordinates, the inversion apex coordinates, etc., of the polygon are read out from a data memory (412) in accordance with this apex number. IMAGE