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Ray Tracing Trimmed Quadric Surfaces

Li Xuejun; Yang Changgui; Sun Jiaguang(Tsinghna University, Beijing)  
new algorithm on ray tracing trimmed quadric surfaces is described in this paper, in which an auxiliary parameter space is introduced. Through preprocessing, the boundary of NURBS can be transferred to that of the new auxiliary parameter space.Line-surface intersection can be treated according to surfaces' algebraic equations and their geometric parameters. Intersections are calculated in the local coordinate system of quadric surfaces, and then they are transferred to the auxiliary parameter space to judge whether the intersections are trimmed off.
【CateGory Index】: TP391.72
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