CAD-Andi nous apporta ses lumieres en ce 2008/01/15 14:07:
> Another thought:
> 
> Would a smaller ammount of mirroring surface speed up rendering? Let's imagine a
> rectangular mirror 100x200 that bounces photons onto a screen (screen not
> parallel to the mirror surface). The lit up area on the screen would look like
> a certain polygonal shape and would be filled completely. Would it take less
> time rendering if the rectangle was only reflecting photons from a 5mm rim
> around the perimeter of the mirror creating somewhat of an outline polygonal
> shape on the screen?
> 
> 
If the spotlight don't cober the whole surface, no.
If the surface is not flat, not realy.
About shooting only at the rim, no gain there, as you still start shooting 
photons at the center of the bounding box. The only effect will be that those 
photons will be blocked before they reatch the target.

A question: do you use more than one light_source? Are they at the same location?

If you answered yes to both, replace them with a single light with an intensity 
egual to the sum of all current sources. This will reduce the number of protons 
to shoot and improve the quality. When several coincident light_source are 
shooting photons at the same target, they all shoot photons in the same pattern. 
It will also cut down on the shadow testing, resulting in another speed increase.

-- 
Alain
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