Search found 42 matches

by raider
Sat Oct 14, 2017 8:26 am
Forum: Links & Papers
Topic: KuaFu Renderer - UPM
Replies: 1
Views: 485

KuaFu Renderer - UPM

Does anybody know what is meant here by Universal Photon-Mapping: http://forums.cgsociety.org/showthread.php?t=1471054
Any known references?
by raider
Wed Jun 24, 2015 9:19 pm
Forum: General Development
Topic: Ideas request for a specific raytracing application
Replies: 28
Views: 12992

Re: Ideas request for a specific raytracing application

Hm... why to ratrace the PCBs at all? who needs that? Sorry for that kind of question, but that's really exotic application of RT. Just curious.
by raider
Mon Apr 06, 2015 9:11 pm
Forum: General Development
Topic: cosine lobe sampling PDF
Replies: 11
Views: 10039

Re: cosine lobe sampling PDF

Hi Josh,
you simply taking wrong integral. Your PDF have to normalize to one over hemisphere.
You are right saying that
int1.png
int1.png (4.28 KiB) Viewed 3117 times

but the integral you need have to be this one:
int2.png
int2.png (23.09 KiB) Viewed 3117 times
by raider
Sat Feb 07, 2015 8:37 pm
Forum: General Development
Topic: Ray Sorting
Replies: 4
Views: 2675

Re: Ray Sorting

by raider
Sat Jan 10, 2015 12:19 am
Forum: General Development
Topic: cosine lobe sampling PDF
Replies: 11
Views: 10039

Re: cosine lobe sampling PDF

Thank's for the link, I plan to implement some microfacet BRDFs as well as a next step. I thought of Phong as about quite simple model to implement for test purposes. But surprisingly it is not so simple. However, I don't understand what you mean by "You don't have to guess/hack about sampling ...
by raider
Fri Jan 09, 2015 12:26 am
Forum: General Development
Topic: cosine lobe sampling PDF
Replies: 11
Views: 10039

cosine lobe sampling PDF

Hi all! I'm trying to sample modified Phong BRDF with cosine lobe distribution. I have no issues with generation of directions on spherical digon around perfect specular direction, but I have doubts on PDF instead. What I see in the Arvo's thesis in section 4.6.4 tells me I need to use O(n) (where n...
by raider
Thu Dec 04, 2014 10:01 pm
Forum: General Development
Topic: Colibri Renderer
Replies: 12
Views: 6730

Re: Colibri Renderer

That's a lot of inspiration )) from just a hundred lines of code!
I'v been in Tbilisi in October, it's a pity I didn't know such enthusiasts like you are their )
Keep posting on the progress!
by raider
Thu Dec 04, 2014 12:19 am
Forum: General Development
Topic: Colibri Renderer
Replies: 12
Views: 6730

Re: Colibri Renderer

Looks very nice!
And that is just one year of development? Do you write entire renderer from scratch or you base on some other open code?
by raider
Tue Sep 02, 2014 3:03 pm
Forum: Tools, Demos & Sources
Topic: Ifu - cloud simulator and renderer
Replies: 22
Views: 19786

Re: Ifu - cloud simulator and renderer

Hm... looks really nice. Where are you going to use that code, any plans?
by raider
Fri Jan 10, 2014 12:27 am
Forum: General Development
Topic: Population Monte Carlo Sampling
Replies: 14
Views: 6803

Re: Population Monte Carlo Sampling

Define "hopeless". I've heard that all adaptive MC is biased, but not an actual explanation for the claim. Heck, even non-adaptive MC renderers become biased and inconsistent as soon as tone mapping comes into the picture, especially if there are fireflies. I'm pretty sure adaptive MC is ...

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