Search found 25 matches

by dawelter
Tue Jul 17, 2018 9:23 pm
Forum: General Development
Topic: Anyone read Laurent Belcour's paper on layered material?
Replies: 2
Views: 910

Re: Anyone read Laurent Belcour's paper on layered material?

I read it and it is on my list to implement next. But I didn't dive into the details yet. Regarding FDG_inf: To my understanding it is basically a better version of FDG. I think there is only one FDG table which is what is used for light transport simulation. Actually calculating FDG_inf seems to be...
by dawelter
Sun Jul 15, 2018 6:38 pm
Forum: Visuals
Topic: My little path tracer
Replies: 16
Views: 7110

Re: My little path tracer

Went for a pretty low hanging fruit: Importance sampled hdr skydomes! :)
hdrskydome.jpg
hdrskydome.jpg (250.73 KiB) Viewed 990 times
by dawelter
Tue Jul 10, 2018 7:49 am
Forum: Visuals
Topic: My little path tracer
Replies: 16
Views: 7110

Re: My little path tracer

Meanwhile I switched to Embree. Now the renderer feels quite a bit faster. I didn't measure because my data structures had to go out of principle because they were so bad. :lol: Still have something to do about the mess I made with mixed double and float calculations that I now have ... But things s...
by dawelter
Tue Jul 10, 2018 7:36 am
Forum: Visuals
Topic: My first Supersize-Image
Replies: 3
Views: 3015

Re: My first Supersize-Image

Oh yeah! I envy the amount of cool rendering fu you implemented! :-)
by dawelter
Tue Apr 24, 2018 8:49 pm
Forum: Visuals
Topic: My little path tracer
Replies: 16
Views: 7110

Re: My little path tracer

I haven't had implemented a refractive material till now. That needed to be rectified badly.

RefractiveCaustics.jpg
RefractiveCaustics.jpg (244.13 KiB) Viewed 1760 times

Not too shabby, I suppose.

(Although, since SDS paths are not rendered, parts are missing. I.e. in lower row, areas behind the glass. And top right, the beam behind the glass.)
by dawelter
Mon Apr 23, 2018 6:33 am
Forum: General Development
Topic: Veach - refractive BTDF adjoint
Replies: 0
Views: 1196

Veach - refractive BTDF adjoint

Hello! I'm trying to understand Veach's derivation of the adjoint of the specular refractive BTDF. It seems I hit a brick wall. Some of that stuff looks like black magic to me. Specifically, there is a relation for differential solid angle on the following page: non-symmetry-due-to-refraction.png Wh...
by dawelter
Fri Apr 20, 2018 7:44 am
Forum: Visuals
Topic: My little path tracer
Replies: 16
Views: 7110

Re: My little path tracer

Thank you beason! Actually there was a bug. I wrongly assumed that pdfs for BSDF sampling are symmetric which they are clearly not. p(wi,wo) = p(wo,wi)? No! no! Ah well, how does one say, assumptions are the mother of all f'ups. I finally realized my mistake when ... I implemented statistical tests ...
by dawelter
Sat Mar 24, 2018 8:38 am
Forum: Visuals
Topic: My little path tracer
Replies: 16
Views: 7110

Re: My little path tracer

I threw a "real world" scene at it. Thinking about how else I could exploit volume caustics in lack of refractive materials, I figure it would be cool to build a solar thermal power plant model. :-D Modelled in Stud.io and Cinema 4D. 677761 Triangles, most of them occluded due to the brick...
by dawelter
Wed Mar 21, 2018 1:26 pm
Forum: General Development
Topic: Spectral tracking question
Replies: 6
Views: 2012

Re: Spectral tracking question

Cool! And thanks for the link to the paper. Very interesting. Do you think it is possible to modify closed-form tracking in such a way that it handles spectrally refined absorption/scattering for homogeneous media correctly? For homogeneous media you have the analytic expression for the transmittanc...
by dawelter
Mon Mar 19, 2018 8:25 am
Forum: General Development
Topic: Spectral tracking question
Replies: 6
Views: 2012

Re: Spectral tracking question

Do you think this looks reasonable? Not sure. The method is pretty noisy, indeed. I actually wonder how you get your reference image so clear with jut 16 spp. Try the weighting scheme from "5.1.2 Incorporating Path History". It should reduce the noise somewhat. I spot one error: - t is up...

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