Search found 48 matches

by dawelter
Fri May 08, 2020 7:07 am
Forum: General Development
Topic: qestion regarding "A null-scattering path integral formulation of light transport"
Replies: 2
Views: 424

Re: qestion regarding "A null-scattering path integral formulation of light transport"

Hi! Nice paper you found there. I try to answer because I may attempt to implement this for my renderer, too. It's just a wild guess, but the authors omitted from algorithm 1 what happens when the particle hits a surface. In Eq (9) there is the last term T(x,z)L^s(z,w) which adds the light from the ...
by dawelter
Sat Mar 14, 2020 2:48 pm
Forum: Visuals, Tools, Demos & Sources
Topic: My little path tracer
Replies: 32
Views: 18784

Re: My little path tracer

Thanks :-) I wasn't very much concerned with memory so far. However, I can tell that this scene uses 2k cells or so. Each of which has to store the coefficients for two mixtures - plus some statistics for the EM algorithm. To be frank, I haven't tested the algorithm on much else than this one scene ...
by dawelter
Wed Mar 04, 2020 7:56 pm
Forum: Visuals, Tools, Demos & Sources
Topic: My little path tracer
Replies: 32
Views: 18784

Re: My little path tracer

Another over-night render. Much better this time. torus_in_cube.jpg I switched to mixtures of Von Mises Fisher distributions and implemented tricks from the "Path Guiding in Production" paper (stochastic filtering and troughput clamping). Together with some parameter tweaking, this helped. Now I can...
by dawelter
Wed Mar 04, 2020 7:40 pm
Forum: General Development
Topic: Path tracing in games
Replies: 26
Views: 23661

Re: Path tracing in games

Oh yes! With volume rendering! Looks very pretty overall. A great start for a game :-)
by dawelter
Sat Feb 08, 2020 9:23 am
Forum: Visuals, Tools, Demos & Sources
Topic: My little path tracer
Replies: 32
Views: 18784

Re: My little path tracer

Here is a first result from my attempt to implement path guiding following the "Path Guiding in Production" paper. So far I have surface guiding only. My ingredients are: * KD-tree inspired by "Practical Path Guiding for Efficient Light-Transport Simulation" by Müller et al.(2017) * Gaussian Mixture...
by dawelter
Sat Feb 08, 2020 9:02 am
Forum: Visuals, Tools, Demos & Sources
Topic: My first Supersize-Image
Replies: 22
Views: 9088

Re: My first Supersize-Image

Yes. You are right. Big scene plus directional light is a problem.

Would you spend more time on scenes in general? I believe you have many cool algorithms, but little material to exploit them ;-)
by dawelter
Wed Jan 08, 2020 9:23 pm
Forum: Visuals, Tools, Demos & Sources
Topic: My first Supersize-Image
Replies: 22
Views: 9088

Re: My first Supersize-Image

Hi! This is indeed very impressive, XMAMan! Say, have you tried to render the atmosphere/cloud scene with UPBP? I have to wonder though how well the algorithm copes with "nature" scenes. Btw, @ ultimatemau, thanks for the tip regarding "Path Guiding in Production". I found it's really a great overvi...
by dawelter
Fri Sep 06, 2019 12:15 pm
Forum: Visuals, Tools, Demos & Sources
Topic: My first Supersize-Image
Replies: 22
Views: 9088

Re: My first Supersize-Image

Nice progress! :)
by dawelter
Tue Apr 09, 2019 8:44 pm
Forum: Visuals, Tools, Demos & Sources
Topic: My little path tracer
Replies: 32
Views: 18784

Re: My little path tracer

Thanks, knightcrawler! :-) Here is a another 24 h rendering. I had this fun idea to make a flat earth version of the globe figure. :lol: glossytransmissiveflatearth.jpg The dome is filled with a thin, scattering medium. This creates the glow effect around the sun. The image has other details which I...
by dawelter
Wed Mar 27, 2019 9:07 pm
Forum: General Development
Topic: Shading normal issues w. adjoint bsdf
Replies: 7
Views: 2965

Re: Shading normal issues w. adjoint bsdf

Hi Charles, thank you. The link has a typo, but it's clear which paper you mean: "Microfacet-based Normal Mapping for Robust Monte Carlo Path Tracing". The results look really nice. One thing bugs me though. In Figure 18th's caption, the authors state "Our normal-mapping model ... fails the white fu...