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All-Frequency Shadows Using Non-linear Wavelet Lighting Approximation (2003)
| Content Provider | CiteSeerX |
|---|---|
| Author | Ng, Ren Ramamoorthi, Ravi Hanrahan, Pat |
| Abstract | 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. |
| File Format | |
| Volume Number | 22 |
| Journal | ACM Transactions on Graphics |
| Language | English |
| Publisher Date | 2003-01-01 |
| Access Restriction | Open |
| Subject Keyword | Small Area Light Pre-computed Light Transport Sparse Transport Matrix Time-varying Illumination Real-time Rendering Linear Spherical Harmonic Current Technique Non-linear Wavelet Environment Map Soft Shadow Non-linear Approximation Light Transport Matrix Wavelet Basis High-resolution Environment Map Sharp Shadow Sparse Light Vector Accurate Rendering Main Contribution Large Low-frequency Light |
| Content Type | Text |
| Resource Type | Article |
