Search found 45 matches

by koiava
Wed Nov 02, 2016 8:11 am
Forum: General Development
Topic: Question about microfacet reverse pdf and SmallVCM
Replies: 2
Views: 5713

Re: Question about microfacet reverse pdf and SmallVCM

As I understand the way you calculate microfacet pdf stays the same, you just call pdf function for light subpath where wi and wo are swapped. Inverse pdf calculation should be same as you do in bdpt so you can take pbrt as reference. https://github.com/mmp/pbrt-v3/blob/master/src/integrators/bdpt.c...
by koiava
Tue Jul 05, 2016 7:30 am
Forum: Tools, Demos & Sources
Topic: Direct Light Integration using MIS
Replies: 11
Views: 8971

Re: Direct Light Integration using MIS

Thanks :)
by koiava
Fri Jul 01, 2016 9:21 am
Forum: Tools, Demos & Sources
Topic: Direct Light Integration using MIS
Replies: 11
Views: 8971

Re: Direct Light Integration using MIS

ah, Thanks :D :)
by koiava
Fri Jul 01, 2016 8:54 am
Forum: Tools, Demos & Sources
Topic: Direct Light Integration using MIS
Replies: 11
Views: 8971

Re: Direct Light Integration using MIS

https://lh3.googleusercontent.com/GsHQCGCekDLtU9fKVdhft98SI_qsvPBtNTGnIwn3a8Ocn5vtZhK08NlQvCqq5mHo-3Hnk969gaq8MrLXCqK8oxedZAkkufGMYrPr-PUoIJ6wncRnwlwiRNLgRAfEB6WdkHWKOOl-VtDruvWc-pM3UJT82hiXxm_7er0hi4yZfqWB17ShhC6XSqmHXsYxpwWGX_FX-EaerRCjq048rnxRLtmgvHWp2LIXaEznTnqiHILPDFQiGQj5_AqxGwGn2tWdlHsB6ihAL...
by koiava
Mon Jun 13, 2016 1:39 pm
Forum: Visuals
Topic: GPU VCM
Replies: 30
Views: 17113

Re: GPU VCM

Great results as always :) Thing which is strange for me in "vcm gpu" video is that photons are very noticeable. Directly visible photons correspond to CD.*L path which should have much lower MIS weight then BPT paths. Am I right? Also in last two videos "BDPT with directional regular...
by koiava
Thu Feb 25, 2016 1:19 pm
Forum: General Development
Topic: Sweep of a solid angle
Replies: 2
Views: 2155

Re: Sweep of a solid angle

You can directly calculate solid angle of spherical rectangle without triangulation.
https://www.solidangle.com/research/egs ... tangle.pdf
by koiava
Thu Feb 04, 2016 9:08 am
Forum: General Development
Topic: A better way to sample a sphere (w.r.t. solid angle)
Replies: 16
Views: 13874

Re: A better way to sample a sphere (w.r.t. solid angle)

Useful conversion from Theta to Alpha. I also used this for cylindrical lights and good thing is that angle at light sample is Alpha+Theta and you can use it easily to calculate pdfs :)
by koiava
Fri Jan 15, 2016 9:38 am
Forum: General Development
Topic: super fast mbvh4 traversal and triangle intersection
Replies: 3
Views: 3124

Re: super fast mbvh4 traversal and triangle intersection

Well done! great improvements :) I tried once multifrusta packet tracing with 2 level BVH and remember that there was problems with packet transformations. If one ray in packet hits leaf of upper BVH you have to transform whole packet to leaf space to continue traversal in lower leaf BVH. As I guess...
by koiava
Thu Jul 02, 2015 12:24 pm
Forum: General Development
Topic: pbrt-v3 source code now available
Replies: 23
Views: 17020

Re: pbrt-v3 source code now available

We might have separate Pdf functions but returning sample and sampling Pdf from sampling function I think is more clear. Is there any case when you are sampling something and you doesn't need to know pdf?
by koiava
Thu Jul 02, 2015 8:56 am
Forum: General Development
Topic: pbrt-v3 source code now available
Replies: 23
Views: 17020

Re: pbrt-v3 source code now available

Hello Matt, Really good news! As I see, there is great major features and improvements, congrats! I'll definitely buy a new book! I have a question about code, there you have sampling function for shape(sphere), and in addition you have function for Pdf? What is the reason to separate those two. Pra...

Go to advanced search