Exploiting Temporal Coherence in Ray Casted Walkthroughs

Havran, Vlastimil; Bittner, Jiri; Seidel, Hans-Peter; Joy, Kenneth I.

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Exploiting Temporal Coherence in Ray Casted Walkthroughs

Havran, V., Bittner, J., & Seidel, H.-P. (2003). Exploiting Temporal Coherence in Ray Casted Walkthroughs. In Proceedings of the 19th Spring Conference on Computer Graphics 2003 (SCCG 03) (pp. 164-172). New York, USA: ACM.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-000F-2CF1-0 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-000F-2CF3-C

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Creators:
Havran, Vlastimil¹, Author
Bittner, Jiri, Author
Seidel, Hans-Peter¹, Author
Joy, Kenneth I., Editor

Affiliations:
1Computer Graphics, MPI for Informatics, Max Planck Society, ou_40047

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Abstract: 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.

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Language(s): eng - English

Dates: Modified: 2004-06-30Date issued: 2003

Publication Status: Issued

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Identifiers: eDoc: 201819
Other: Local-ID: C125675300671F7B-8FBB3C9E989B6A44C1256CFE007D9073-Havran2003:SCCG

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Title: SCCG 2003

Place of Event: Budmerice, Slovakia

Start-/End Date: 2003-04-24 - 2003-04-26

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Title: Proceedings of the 19th Spring Conference on Computer Graphics 2003 (SCCG 03)

Source Genre: Proceedings

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Publ. Info: New York, USA : ACM

Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 164 - 172 Identifier: -