Microsoft Research has in the past developed a similar (though not equivalent) approach: http://research.microsoft.com/en-us/um/people/cloop/LoopBlinn05.pdf htt

Microsoft Research has in the past developed a similar (though not equivalent) approach: http://research.microsoft.com/en-us/um/people/cloop/LoopBlinn05.pdf http://research.microsoft.com/en-us/um/people/cloop/LoopBlin...