Disclosed is a method of reducing the complexity of hidden surface removal in 3D grapghic systems. A fuzzy projection (FF) of a surface (SU) as seen from a number of viewpoints (VP) in a bounding box (BB) is stored in a buffer (FA) having elements (FE). A combination of all the patches (PT) of the surface...http://www.google.com/patents/US6172679?utm_source=gb-gplus-sharePatent US6172679 - Visibility calculations for 3D computer graphics
