Practical and theoretical implementation discussion.
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ingenious wrote:Hm, looks similar indeed. Though I cannot understand Jacco's reply.
Hm, indeed, it's the same thing. Sorry for the confusion.
voidcycles wrote:What if you have more light sources than you can fit in memory? Would you still use a discrete sample table?
That would be an interesting scene.
I target interactive rendering, so everything will definitely be in-core.
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How a scene cannot fit all the light sources in memory ?
You can play with 2 arrays :
1 - A array for the lights source, N lights mean an array of size N
2 - An array of indices that point to the first array
This way you can have a lot of lights...
Of course, it is still possible to do some out-of-core rendering if you really have a hughe scene !
OMPF 2 global moderator
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Here's an article of interest about efficiently sampling discrete distributions: http://www.keithschwarz.com/darts-dice-coins/
. Of particular interest is the Alias method which can sample in O(1) with O(n) memory. If I'm not mistaking, Jacco's technique is described in "Simulating a Loaded Die with a Fair Die".