-
- Peter-Pike Sloan
- Microsoft Corporation
-
- Xinguo Liu
- Microsoft Research Asia
-
- Heung-Yeung Shum
- Microsoft Research Asia
-
- John Snyder
- Microsoft Research
抄録
<jats:p>Radiance transfer represents how generic source lighting is shadowed and scattered by an object to produce view-dependent appearance. We generalize by rendering transfer at two scales. A macro-scale is coarsely sampled over an object's surface, providing global effects like shadows cast from an arm onto a body. A meso-scale is finely sampled over a small patch to provide local texture. Low-order (25D) spherical harmonics represent low-frequency lighting dependence for both scales. To render, a coefficient vector representing distant source lighting is first transformed at the macro-scale by a matrix at each vertex of a coarse mesh. The resulting vectors represent a spatially-varying hemisphere of lighting incident to the meso-scale. A 4D function, called a radiance transfer texture (RTT), then specifies the surface's meso-scale response to each lighting basis component, as a function of a spatial index and a view direction. Finally, a 25D dot product of the macro-scale result vector with the vector looked up from the RTT performs the correct shading integral. We use an id map to place RTT samples from a small patch over the entire object; only two scalars are specified at high spatial resolution. Results show that bi-scale decomposition makes preprocessing practical and efficiently renders self-shadowing and interreflection effects from dynamic, low-frequency light sources at both scales.</jats:p>
収録刊行物
-
- ACM Transactions on Graphics
-
ACM Transactions on Graphics 22 (3), 370-375, 2003-07
Association for Computing Machinery (ACM)
- Tweet
詳細情報 詳細情報について
-
- CRID
- 1360292618732987904
-
- NII論文ID
- 30022063324
-
- ISSN
- 15577368
- 07300301
- http://id.crossref.org/issn/07300301
-
- データソース種別
-
- Crossref
- CiNii Articles