Search found 34 matches

by cessen
Wed Aug 01, 2018 7:45 am
Forum: Links & Papers
Topic: Importance Sampling of Many Lights with Adaptive Tree Splitting
Replies: 7
Views: 570

Re: Importance Sampling of Many Lights with Adaptive Tree Splitting

Couldn't help myself, and I did a quick test comparing the importance estimate currently in Psychopath to the left side of equation 3 in the paper (i.e. omitting the light orientation component): Analytic Lambert over spherical cap solid angle & clamped inverse square hack (current Psychopath): ...
by cessen
Tue Jul 31, 2018 2:39 pm
Forum: Links & Papers
Topic: Importance Sampling of Many Lights with Adaptive Tree Splitting
Replies: 7
Views: 570

Re: Importance Sampling of Many Lights with Adaptive Tree Splitting

Whoa! I always forget how many researchers and paper authors frequent this forum. Thanks for the reply, fpsunflower! A note about my last note: re-reading it, I realize it may have come off as accusatory, which absolutely wasn't my intention. I certainly didn't think you guys were intentionally misr...
by cessen
Tue Jul 31, 2018 4:57 am
Forum: Links & Papers
Topic: Importance Sampling of Many Lights with Adaptive Tree Splitting
Replies: 7
Views: 570

Re: Importance Sampling of Many Lights with Adaptive Tree Splitting

I've skimmed the paper now, and they definitely have made some great contributions! This really fleshes out the light tree method. I'm especially pleased to see that they've accounted for non-omnidirectional lights. I helped to mentor Petra Gospodnetić (who they also cited) when she implemented ligh...
by cessen
Tue Jul 31, 2018 3:21 am
Forum: Links & Papers
Topic: Importance Sampling of Many Lights with Adaptive Tree Splitting
Replies: 7
Views: 570

Re: Importance Sampling of Many Lights with Adaptive Tree Splitting

Whoa! They even cited me! Pretty sure this is the first time my name has ever been in a paper. Super excited!

I wonder if they saw my post beforehand, or if they came up with it independently and cited after searching for prior art.

(Also, yes, my name is Nathan Vegdahl. :-) )
by cessen
Thu Mar 31, 2016 2:54 pm
Forum: General Development
Topic: Efficient sampling of many lights
Replies: 22
Views: 19154

Re: Efficient sampling of many lights

Never got around to writing a paper on the technique in the OP, but it looks like someone else did! http://jcgt.org/published/0005/01/02/ The second half of the paper describes a technique essentially the same as my OP, but in more formal terms. Really cool! Hopefully this approach will get more vis...
by cessen
Tue Sep 29, 2015 5:51 am
Forum: General Development
Topic: Sobol' sequences
Replies: 11
Views: 10252

Re: Sobol' sequences

Okay, I have some more sample test images. Here is (14,15) at 64, 256, and 65536 samples, respectively: http://perm.cessen.com/2015/ompf2/faure_halton_64spp_14_15.png http://perm.cessen.com/2015/ompf2/faure_halton_256spp_14_15.png http://perm.cessen.com/2015/ompf2/faure_halton_65536spp_14_15.png And...
by cessen
Mon Sep 28, 2015 11:11 pm
Forum: General Development
Topic: Sobol' sequences
Replies: 11
Views: 10252

Re: Sobol' sequences

Also, I don't have personal experience with this approach, but Pixar developed something they call "Multi-Jittered Sampling" that extends jittered sampling into high dimensions (if I'm remembering correctly): http://graphics.pixar.com/library/Multi ... dSampling/
by cessen
Mon Sep 28, 2015 11:06 pm
Forum: General Development
Topic: Sobol' sequences
Replies: 11
Views: 10252

Re: Sobol' sequences

I'm not at my machine where my test code is at the moment, but in the past I've done tests from 16 all the way up to over 64,000 samples (doubling the samples each time). IIRC they seemed to hold up just fine. There's definitely some uneven density in the higher dimensions, but not big holes (as I r...
by cessen
Mon Sep 28, 2015 5:16 am
Forum: General Development
Topic: Sobol' sequences
Replies: 11
Views: 10252

Re: Sobol' sequences

What's considered "state of the art" these days? I don't know what's considered state of the art, but I've been quite happy with Leonhard Grünschloß's Faure-permuted Halton. Here's 4096 points of 14,15: http://perm.cessen.com/2015/ompf2/faure_halton_14_15.png Here's 4096 points of 24,25: ...
by cessen
Mon Jul 07, 2014 5:18 am
Forum: Visuals
Topic: Psychopath: a microgeometry path tracer
Replies: 16
Views: 21281

Re: Psychopath: a microgeometry path tracer

Glossy render! Yay! No more boring lambert! There are obviously still some bugs in the implementation, but it's more-or-less working. http://perm.cessen.com/2014/psychopath/renders/gtr_glossy.png Also, I made a blog for Psychopath, if anyone is curious: http://psychopath.io

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