@AriSilvennoinen @rygorous @self_shadow I assume you've seen Jim Blinn's old article series on the sphere rasterization he did for NASA?
Updated blog post on sphere rasterization: now with efficient screen space bounds, thanks @rygorous and @self_shadow! http://bit.ly/QZU73Z
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@pervognsen@AriSilvennoinen@rygorous I'd forgotten about that! Blinn wrote another: "Calculating Screen Coverage" which I've used before.
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@AriSilvennoinen@self_shadow When I wrote that mail to GD-Algorithms, I was down with the flu or I'd have given a proper explanation :) -
@rygorous@AriSilvennoinen No worries. It's definitely come in handy. I've passed that snippet on to a few people since then. Cheers! :)
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@AriSilvennoinen@self_shadow FWIW, here's the original ver of that code in context: https://github.com/farbrausch/fr_public/blob/master/werkkzeug3/engine.cpp#L4265 … (Point light bounds in kkrieger). -
@rygorous@self_shadow Thanks! I added a link to it.
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@AriSilvennoinen@rygorous@self_shadow Counterexample to "proof" that sphere projection is an ellipse: http://nothings.org/remote/projection_of_sphere.png … Conic section. -
@nothings@AriSilvennoinen@rygorous@self_shadow The basic method is sound. But yes, it yields conics in general: http://en.wikipedia.org/wiki/Dandelin_spheres … - Voir les réponses
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