Search found 166 matches

by alpistinho
Sat Mar 28, 2020 4:39 pm
Forum: Development
Topic: Blue noise dithered Sobol
Replies: 19
Views: 1262

Re: Blue noise dithered Sobol

Just to give an update, I haven't really been able to create something that: Has blue-noise characteristics in screen space Doesn't have a heavy correlation between dimensions Doesn't need to generate an absurd amount of samples The version using Owen scrambled Sobol samples works ok for the first 2...
by alpistinho
Fri Mar 27, 2020 3:03 pm
Forum: User Support
Topic: Activation problem with V 2.3
Replies: 3
Views: 125

Re: Activation problem with V 2.3

Mint is based on Ubuntu.

The 18 release is still based on Ubuntu 16.04, if I'm not mistaken.
by alpistinho
Thu Mar 19, 2020 2:33 pm
Forum: Development
Topic: Blue noise dithered Sobol
Replies: 19
Views: 1262

Re: Blue noise dithered Sobol

Sharlybg wrote:
Thu Mar 19, 2020 1:01 pm
He it in the master ready for test ?

want to integrated theses improvements in my cycles vs luxcore test i'm working on.
Definitely not, the code is a bunch of patches thrown together and it is not even rebased for 2.4
by alpistinho
Thu Mar 19, 2020 2:26 pm
Forum: Development
Topic: Blue noise dithered Sobol
Replies: 19
Views: 1262

Re: Blue noise dithered Sobol

BTW keep in mind that I posted here an evolution of that method, this is the link: https://hal.archives-ouvertes.fr/hal-02158423/file/blueNoiseTemporal2019_slides.pdf This is only valid for animation rendering. The counterpart for still rendering is the one I mentioned in the first post, using Owen...
by alpistinho
Wed Mar 18, 2020 11:55 pm
Forum: Development
Topic: Blue noise dithered Sobol
Replies: 19
Views: 1262

Re: Blue noise dithered Sobol

Thanks for the test. As far as I understand, the method implemented in Cycles is described here: https://www.arnoldrenderer.com/research/dither_abstract.pdf This method degrades into white noise as the rendering goes on, so I assume that by 200 samples there would be not that much difference between...
by alpistinho
Sun Mar 15, 2020 4:32 pm
Forum: Development
Topic: Blue noise dithered Sobol
Replies: 19
Views: 1262

Re: Blue noise dithered Sobol

Hi, Now I've hacked it into my PMJ02 patch: I'm doing the same thing we do with the current sobol samples. Applying the Cranley-Patterson rotation to the samples but using the blue mask. According to the Siggraph "My favorite samples" panel we have to apply this rotation but only inside each stratum...
by alpistinho
Sun Mar 15, 2020 3:23 pm
Forum: Development
Topic: Blue noise dithered Sobol
Replies: 19
Views: 1262

Re: Blue noise dithered Sobol

Hi,

The both sampling are tiled over 128x128 pixels, so it is completely reasonable that there are correlation artifacts.
I will download the new scene to test.

About the noise, it is most likely due to the Owen scrambling. I saw the same effect when using my PMJ02 patch
by alpistinho
Sun Mar 15, 2020 2:50 pm
Forum: Development
Topic: Blue noise dithered Sobol
Replies: 19
Views: 1262

Re: Blue noise dithered Sobol

The improvement is only for very low sample counts. I can see that the pattern is a bit more pleasing, but it is not a huuuge deal. I actually made the newer paper method work: (Besides having the blue-noise properties it also uses Owen-scrambled Sobol points, so it should have somewhat better conve...
by alpistinho
Sun Mar 15, 2020 2:43 pm
Forum: Development
Topic: Blue noise dithered Sobol
Replies: 19
Views: 1262

Re: Blue noise dithered Sobol

Not yet, but the reports from Cycles is that blue noise improves denoise performance.
I will check it
by alpistinho
Sun Mar 15, 2020 2:07 pm
Forum: Development
Topic: Blue noise dithered Sobol
Replies: 19
Views: 1262

Blue noise dithered Sobol

Hi, I have been investigating this topic lately and wanted to discuss if we have some reasonable way to implement that. 1st idea: I basically stole Cycles implementation (https://developer.blender.org/D2149) The idea is basically to use a blue noise mask to offset the samples between pixels. Instead...