3 ms·
> One thing people (myself included!) often missed though is that Metropolis is extremely prone to flicker. Doing PCA across frames basically eliminates that.
by erichocean 10y ago
> One thing people (myself included!) often missed though is that Metropolis is extremely prone to flicker.
Doing PCA across frames basically eliminates that. IIRC Pixar did a paper on the technique.
- jcl 10y agoActually, the Renderman denoiser is based on work from Disney Research. https://renderman.pixar.com/view/denoiser https://renderman.pixar.com/view/denoiser PCA would be one way to do that. This recent paper suggests that they may be decomposing the samples mostly by path type, though: https://www.disneyresearch.com/publication/pathspace-decomposition/ https://www.disneyresearch.com/publication/pathspace-decompo...
- boulos 10y agoHe's referring to the older 2008 paper that did PCA, Statistical Acceleration for Animated Global Illumination: http://graphics.pixar.com/library/ShotRendering/paper.pdf http://graphics.pixar.com/library/ShotRendering/paper.pdf