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Hodgman

Accurate Analytic Approximations for Real-Time Specular Area Lighting

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It smells like patented.

Yeah I just saw a twitter convo where people were expressing that fear. The author has a long list of patents covering their research publications apparently...

Good news from that convo was that Epic's Brian Karis claims to have independently invented a similar but different technique. Hopefully he shares his findings in the future :)

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Nice.

Some years ago I spent some time on approximating area lights in a way I could consider passable... I decided to push it in the future and I can totally see that decision as correct.

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