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Don't forget about implicit curve rendering [0]. The patent will expire soon [1].

I wrote an implementation of the Loop/Blinn paper for Microsoft Game Studios ~20 years ago, I wonder if they're still using it.

Had to do a _lot_ of work to make it production-ready, as their voronoi-based tesselation goes pathological on a lot of Asian glyphs.

I may be remembering totally wrong, but isn't the algorithm used in Slug patented?