Search found 40 matches

by dawelter
Sat Feb 23, 2019 9:04 am
Forum: Visuals
Topic: Glitch Pictures anyone?
Replies: 81
Views: 110615

Re: Glitch Pictures anyone?

Trying to implement beam radiance estimation. Regular photon mapping. This is roughly what it should look like. photonmap.jpg I use a piecewise constant estimate of the transmittance function where I do the beam query. Read beyond array bounds. Need to put range checks in assert macro everywhere, ev...
by dawelter
Sat Feb 23, 2019 8:45 am
Forum: General Development
Topic: Shading normal issues w. adjoint bsdf
Replies: 7
Views: 868

Re: Shading normal issues w. adjoint bsdf

Hi. Thanks for your reply. At least it is good that I didn't totally misunderstood something there. For some reason the correction factor went way down, when I used another mesh (higher res version of the stanford bunny). I could swear it has a similar amount of jagged edges. I start to think, that ...
by dawelter
Sat Feb 16, 2019 9:35 am
Forum: General Development
Topic: Shading normal issues w. adjoint bsdf
Replies: 7
Views: 868

Shading normal issues w. adjoint bsdf

Hi there, I seek help for robustly implementing Veach's correction for shading normals for the adjoint BSDF, i.e. for photon mapping or light tracing. The problem: According to Veach we should add a correction factor that compensates for using shading normals instead of geometry normals: eq5.18.PNG ...
by dawelter
Wed Jan 09, 2019 8:13 am
Forum: General Development
Topic: Why is volumetric emission proportional to absorption coefficient?
Replies: 7
Views: 12545

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: 28
Views: 12672

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: 2167

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: 28
Views: 12672

Re: My little path tracer

Went for a pretty low hanging fruit: Importance sampled hdr skydomes! :)
hdrskydome.jpg
hdrskydome.jpg (250.73 KiB) Viewed 3412 times
by dawelter
Tue Jul 10, 2018 7:49 am
Forum: Visuals
Topic: My little path tracer
Replies: 28
Views: 12672

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: 11
Views: 5014

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: 28
Views: 12672

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 4182 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.)