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Soft shadow volumes for ray tracing

In English

Författare

Summary, in English

We present a new, fast algorithm for rendering physically-based soft shadows in ray tracing-based renderers. Our method replaces the hundreds of shadow rays commonly used in stochastic ray tracers with a single shadow ray and a local reconstruction of the visibility function. Compared to tracing the shadow rays, our algorithm produces exactly the same image while executing one to two orders of magnitude faster in the test scenes used. Our first contribution is a two-stage method for quickly determining the silhouette edges that overlap an area light source, as seen from the point to be shaded. Secondly, we show that these partial silhouettes of occluders, along with a single shadow ray, are sufficient for reconstructing the visibility function between the point and the light source.

Publiceringsår

2005

Språk

Engelska

Sidor

1156-1165

Publikation/Tidskrift/Serie

ACM Transactions on Graphics

Volym

24

Issue

3

Dokumenttyp

Artikel i tidskrift

Förlag

Association for Computing Machinery (ACM)

Ämne

  • Computer Science

Nyckelord

  • shadow algorithms
  • visibility determination

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0730-0301