clipka wrote:
> nemesis schrieb:
>> At least until very recently V-Ray used regular biased backwards 
>> raytracing with
>> photon mapping, except incredibly optimized.  Perhaps those speckles 
>> in the
>> video have simply something to do with the GPU calculating an insane 
>> amount of
>> rays and rendering pixels out of order?
> 
> Well, maybe they're artifacts of the photon mapping; that would appear 
> to be quite fitting.

They're artifacts of forward based monte-carlo GI.

The idea is something along the lines of, every time you need to take a 
light sample, you just shoot one randomly (rather than POV's method of 
using many surrounding samples) and deal with it.  Thus, the speckles.

The next step is to re-render the scene, and average the results with 
the previous.  For this reason, images rendered in this manner show a 
full scene quite quickly but with horrible quality, while the longer you 
leave them running the more they resolve into high quality images.

You can see this in the video as things get really crappy when they move 
the camera, and resolve into higher quality when they don't.

...Chambers

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