Abstract

Local updating is a strategy for making incremental changes to a geometric model and its displayed image for constant viewing position. Only those parts of a model that are affected by modifications are recomputed and redisplayed, which considerably increase efficiency compared to updating the complete model and its display. Methods are presented for local updating in a solid modelling system with a CSG scanline visible-surface algorithm that can display shaded images directly from a CSG tree using polyhedral primitives. Special attention is given to precise determination of the screen areas that must be updated. It is performed in three stages: rectangular areas, edges, and parts of scanlines of interest are successively determined.

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