GVU Technical Report Number:
GIT-GVU-93-30
Title:
Exact Ray-Traced Animation Frames Generated by Reprojection
Authors:
Stephen J. Adelson
Larry F. Hodges
Abstract:
The majority of computer graphics images are generated as part of a
sequence of animation frames. The usual approach for producing these
images is to render each frame as if it were a single, isolated image. A
technique is described which exploits spatial-temporal coherence between
frames to speed up the generation of a ray-traced animation sequence.
The concept is that the information gained when ray-tracing a particular
frame in a sequence may be used to speed up the generation of adjacent
frames, reprojecting samples from one frame to the next. This approach
promises significant savings when ray-tracing animations which have
moving and rotating viewpoints, objects and/or light sources. The
algorithm is tested on an animation with many reflective surfaces, yet it
still attains up to 96% savings over full ray-tracing in terms of the
number of rays cast.
Keywords:
Display algorithms, ray-traced animation, spatial coherence, temporal
coherence
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