All-frequency shadows using non-linear wavelet lighting approximation

• Ren Ng

  Stanford University

• Ravi Ramamoorthi

  Columbia University

• Pat Hanrahan

  Stanford University

抄録

We present a method, based on pre-computed light transport, for real-time rendering of objects under all-frequency, time-varying illumination represented as a high-resolution environment map. Current techniques are limited to small area lights, with sharp shadows, or large low-frequency lights, with very soft shadows. Our main contribution is to approximate the environment map in a wavelet basis, keeping only the largest terms (this is known as a non-linear approximation ). We obtain further compression by encoding the light transport matrix sparsely but accurately in the same basis. Rendering is performed by multiplying a sparse light vector by a sparse transport matrix, which is very fast. For accurate rendering, using non-linear wavelets is an order of magnitude faster than using linear spherical harmonics, the current best technique.

収録刊行物

• ACM Transactions on Graphics

  ACM Transactions on Graphics 22 (3), 376-381, 2003-07

  Association for Computing Machinery (ACM)

キーワード

• Computer Graphics and Computer-Aided Design

詳細情報

• CRID: 1361699995819831168
• NII論文ID: 30022063325
• DOI: 10.1145/882262.882280
• ISSN: 15577368
• ISSN: 07300301
• Web Site: https://dl.acm.org/doi/pdf/10.1145/882262.882280
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