Pre-computed Shadow Textures
Lightmaps are static shadow textures
- Compute lightmaps off-line with radiosity solver
- local lighting models evaluated on tight grid can work well too
- Lightmaps with soft shadows can be built faster with convolution approach, accelerated using the Fast Fourier Transform [Soler & Silion 98]
- Pre-computed shadow textures work well for building interior with lots of diffuse surfaces