Sunday, September 25, 2016

Here's a useful PCA paper I found while writing HW1's renderer

I used this technique in a real-time GPU DXT1 encoder I wrote around 10 years ago:

"Candid Covariance-Free Incremental Principal Component Analysis"

With this approach you can compute a decent-enough PCA in a few lines of shader code.

HW1 used this encoder to compress all of the GPU splatted terrain textures into a GPU texture cache. One of my coworkers, Colt McAnlis, designed and wrote the game's amazing terrain texture caching system.

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