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Navstar
09-29-2010, 02:41 PM
How do IES lights work? It reminds me a lot of the flashlight in Doom 3 or Alan Wake.

To me, it looks a bit like an HDR light mask applied to an omni. Is it really mathematically calculating every ray's falloff and spread? That seems incredibly complex.

ndeboar
10-06-2010, 10:48 PM
pretty sure it's just a 2d respesetation of light fall off. Dont think it's that hardcore (but im happy to be proved wrong).

Here's a 2d respresentation of some IES data:

http://www.luxrender.net/wiki/images/b/b9/Iescones.jpg

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10-06-2010, 10:48 PM
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