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Automatic pre-tessellation culling

In English

Författare

Summary, in English

Graphics processing units supporting tessellation of curved surfaces with displacement mapping exist today. Still, to our knowledge, culling only occurs after tessellation, that is, after the base primitives have been tessellated into triangles. We introduce an algorithm for automatically computing tight positional and normal bounds on the fly for a base primitive. These bounds are derived from an arbitrary vertex shader program, which may include a curved surface evaluation and different types of displacements, for example. The obtained bounds are used for backface, view frustum, and occlusion culling before tessellation. For highly tessellated scenes, we show that up to 80% of the vertex shader instructions can be avoided, which implies an "instruction speedup" of 5x. Our technique can also be used for offline software rendering.

Publiceringsår

2009

Språk

Engelska

Sidor

19-19

Publikation/Tidskrift/Serie

ACM Transactions on Graphics

Volym

28

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

Association for Computing Machinery (ACM)

Ämne

  • Computer Science

Nyckelord

  • Tessellation
  • Culling
  • Computer Graphics

Status

Published

Forskningsgrupp

  • Computer Graphics

ISBN/ISSN/Övrigt

  • ISSN: 0730-0301