WSCG 2004 (submitted)
We showed how it is possible to adapt Photon Mapping to a spectral rendering without consuming extra memory while keeping a very good accuracy. Taking into account spectral emission and reflections permitted us to do accurate IR rendering. Our multi-pass method is faster than classical method when photon map fits entirely in memory. We can use an unlimited number of photons. We avoid problems due to photon map caching such as swapping and cache defaults. Thus our method can match very accurate results. This is very interesting for IR rendering, while we can through enough photons to have the noise disappeared.