Search found 27 matches

by dawelter
Wed Jan 09, 2019 8:13 am
Forum: General Development
Topic: Why is volumetric emission proportional to absorption coefficient?
Replies: 7
Views: 11692

Re: Why is volumetric emission proportional to absorption coefficient?

Ha! Now this comes a bit late, but I appreciate you posting this experiment. It is very cool indeed. I think, in contrast to the assumptions in that part of the lecture, the lamp is not a black body. At least, obviously, its emission spectrum is does not follow Planck's law. Please don't ask when in...
by dawelter
Tue Jan 08, 2019 8:02 pm
Forum: Visuals
Topic: My little path tracer
Replies: 17
Views: 10010

Re: My little path tracer

Hello guys, I continued working on my renderer for a bit. I added support for emissive media to my path tracing algorithms. At the moment it can only render that particular demo medium shown in the image below. The issue is that I'm missing a general volume representation which would allow for sampl...
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: 1780

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: 17
Views: 10010

Re: My little path tracer

Went for a pretty low hanging fruit: Importance sampled hdr skydomes! :)
hdrskydome.jpg
hdrskydome.jpg (250.73 KiB) Viewed 2437 times
by dawelter
Tue Jul 10, 2018 7:49 am
Forum: Visuals
Topic: My little path tracer
Replies: 17
Views: 10010

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: 3952

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: 17
Views: 10010

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 3207 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: 2315

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: 17
Views: 10010

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: 17
Views: 10010

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...

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