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The usual approach for producing an animation is to render each frame as if it were a single, isolated image. Badt described a technique for using reprojection (shifting pixel values between frames) to create approximate ray-traced animation frames of diffuse polygons. The technique described in this paper extends and improves Badt's algorithm, allowing exact frames and full ray-tracing. The method retains primary ray and first-level shadow ray information between frames using a process that becomes more efficient as the complexity of object intersection tests increases. In test sequences, the algorithm attains up to 92% savings in rendering time.
Display algorithms, Ray-traced animation, Spatial Coherence, Temporal Coherence
Stephen J. Adelson, Larry F. Hodges, "Generating Exact Ray-Traced Animation Frames by Reprojection", IEEE Computer Graphics and Applications, vol. 15, no. , pp. 43-52, May 1995, doi:10.1109/38.376612
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