question about camera sampling

Practical and theoretical implementation discussion.
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MohamedSakr
Posts: 83
Joined: Thu Apr 24, 2014 2:27 am

question about camera sampling

Post by MohamedSakr » Sun Oct 19, 2014 5:30 pm

the question is to extend PBRT
I noticed that one of the best samplers is LD sampler, it converges at a very good rate, but it has one drawback!!, it needs a very straight forward algorithm like PT or BDPT, it is unusable with an algorithm like VCM "where the image needs to be integrated as a whole due to VM, not as a pixel by pixel"

so is there a sampler that can give me a "good" sub pixel x,y? "random sampler is pretty bad for this"

some clarification about LD sampler limitation:
if I have an image which needs 1000 spp, LD sampler gives the whole 1000 spp once "by shuffling and other per pixel area calculations" , this has a main drawback of "I want just 1 sample at a time!!, but I want it at a good position, may be depending on a sequence rather than the naive random sampler"

Dade
Posts: 206
Joined: Fri Dec 02, 2011 8:00 am

Re: question about camera sampling

Post by Dade » Sun Oct 19, 2014 6:57 pm

Check the Sobol sampler in LuxRender (https://bitbucket.org/luxrender/luxrays ... ult#cl-270) or Blender Cycles.

P.s. LD can be slow, requires memory storage and is plain horrible for GPUs.

MohamedSakr
Posts: 83
Joined: Thu Apr 24, 2014 2:27 am

Re: question about camera sampling

Post by MohamedSakr » Sun Oct 19, 2014 7:33 pm

thanks a lot Dade :D

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