Name
Abstract | ||
|---|---|---|
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. |
Year | DOI | Venue |
|---|---|---|
2003 | 10.1145/1201775.882279 | ACM Trans. Graph. |
Keywords | Field | DocType |
illumination,rendering,monte carlo technique,spherical harmonic,spatial index,graphics hardware,low frequency | Computer vision,Computer graphics (images),Scalar (mathematics),Computer science,Matrix (mathematics),Spherical harmonics,Artificial intelligence,Dot product,Precomputed Radiance Transfer,Rendering (computer graphics),Radiance,Spatial database | Journal |
Volume | Issue | ISSN |
22 | 3 | 0730-0301 |
ISBN | Citations | PageRank |
1-58113-709-5 | 43 | 1.75 |
References | Authors | |
15 | 4 | |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Peter-Pike Sloan | 1 | 796 | 45.22 |
| Xinguo Liu | 2 | 404 | 25.92 |
| Heung-Yeung Shum | 3 | 10824 | 739.88 |
| John Snyder | 4 | 2579 | 172.17 |