VOLUME CLIPPING IN COMPUTER 3D GRAPHICS

摘要

A method and apparatus are provided for clipping modifier volumes in a 3-dimensional computer graphics generating system. Objects are represented as a set of planar polygons. An indication is then provided as to which of the polygons form modifier volumes. A determination is made as to which polygon's modifier volume intersect a clipping plane (4). Further polygons are then generated on the clipping plane within the intersections of the polygons of the modifier volume with the clipping plane and these are inserted into the set of planar polygons. The portions of the polygons which are determined to lie in front of the clipping plane are then discarded.