Generating Exact Ray-Traced Animation Frames by Reprojection

  • Authors:
  • Stephen J. Adelson;Larry F. Hodges

  • Affiliations:
  • -;-

  • Venue:
  • IEEE Computer Graphics and Applications
  • Year:
  • 1995

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Abstract

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.