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Exploiting Temporal Coherence in Ray Casted Walkthroughs

MPG-Autoren
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Havran,  Vlastimil
Computer Graphics, MPI for Informatics, Max Planck Society;

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Seidel,  Hans-Peter       
Computer Graphics, MPI for Informatics, Max Planck Society;

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Zitation

Havran, V., Bittner, J., & Seidel, H.-P. (2003). Exploiting Temporal Coherence in Ray Casted Walkthroughs. In K. I. Joy (Ed.), Proceedings of the 19th Spring Conference on Computer Graphics (pp. 149-155). New York, USA: ACM.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-000F-2CF1-0
Zusammenfassung
We present a technique that aims at exploiting temporal coherence of ray casted
walkthroughs. Our goal is to reuse ray/object
intersections computed in the last frame of the walkthrough for
acceleration of ray casting in the current frame. In particular we aim at
eliminating the ray traversal and computing only a single ray/object
intersection per pixel. If our technique does not succeed in determining
visibility, it falls back to the classical ray traversal. Visible point samples
from the last frame are reprojected to the current frame. To identify whether
these samples can be reused we apply splatting and epipolar geometry
constraints. We discuss two additional techniques that handle correct
appearance of small objects. We conducted a series of tests on walkthroughs of
building interiors. Our method succeeded in determining visibility of more than
78\% of pixels. For these pixels only a single ray/object intersection is
executed. The frame rate is increased by up to 47\%. Finally, we
argue that the achieved speedup is relatively significant by comparing the
performance of our algorithm to the ``ideal'' ray shooting algorithm.