Search found 50 matches

by Dietger
Thu Feb 13, 2014 6:19 pm
Forum: General Development
Topic: Hair intersection : approaches ?
Replies: 16
Views: 13252

Re: Hair intersection : approaches ?

Having another ray/primitive intersection, aside from ray/triangle, is particularly GPU-unfriendly. I am curios to know why you think this is much worse on the GPU then CPU. Do you have any experience trying this? I admit to never have tried it myself, but my gut feeling is that it can't be that ba...
by Dietger
Fri Jan 17, 2014 2:52 pm
Forum: General Development
Topic: Hybrid : CPU & GPU strategies
Replies: 14
Views: 11440

Re: Hybrid : CPU & GPU strategies

It is what I also expect... but notice that in the current case I have 8 threads... and 8 "gpu commands queues". So, I should have a lot of parallel asynchronous send/receive/execute commands in the queues... ... at the end it should be the same than having several "sets" in the same thread... or I...
by Dietger
Tue Jan 14, 2014 1:56 pm
Forum: Visuals, Tools, Demos & Sources
Topic: WebGL path tracer
Replies: 4
Views: 10034

Re: WebGL path tracer

Cool, and it gets even better after about 1000 seconds when the floating point precision starts to be insufficient :D
by Dietger
Thu Jan 09, 2014 9:54 am
Forum: General Development
Topic: Population Monte Carlo Sampling
Replies: 14
Views: 11103

Re: Population Monte Carlo Sampling

Metropolis is superior to PMC (because it is able to sample all the 1000 "peaks"). Unfortunately its slightly more complicated than that. MLT is only as good as its mutation strategies. Sure it samples the peaks proportional to their contribution, but if the mutation strategies cannot effectively e...
by Dietger
Wed Jan 08, 2014 5:54 pm
Forum: Visuals, Tools, Demos & Sources
Topic: what is realism in realtime rendering?
Replies: 5
Views: 10227

Re: what is realism in realtime rendering?

And the award goes to... the cache oblivious foveated parallelized ray tracer!!! [applause]
by Dietger
Wed Jan 08, 2014 9:46 am
Forum: General Development
Topic: Population Monte Carlo Sampling
Replies: 14
Views: 11103

Re: Population Monte Carlo Sampling

As I stated earlier on this forum ( http://ompf2.com/viewtopic.php?f=3&t=789&p=2268#p2268 ), I have some doubts concerning the PMC-ERPT paper. To me, the paper is skipping over important proofs and details and I am therefore not convinced that it actually makes sense. But I would love to be proven w...
by Dietger
Mon Jan 06, 2014 1:00 pm
Forum: General Development
Topic: Population Monte Carlo Sampling
Replies: 14
Views: 11103

Re: Population Monte Carlo Sampling

It seems like an interesting method, but i never tried it. Note that the PMC methods in the mentioned paper are not very advanced because the resampling step is completely omitted. Basically, the sampling method is adapted between iterations based on information gathered during previous iterations. ...
by Dietger
Thu Nov 28, 2013 4:57 pm
Forum: Links & Papers
Topic: Joint Importance Sampling of Low-order Volumetric Scattering
Replies: 8
Views: 12109

Re: Joint Importance Sampling of Low-order Volumetric Scatte

It would improve all images with area lights (with all methods), but only slightly and mostly in the areas very close to the light sources. Right, that obviously only improves things if the probability of actually hitting the light source is significant which is the case close to the lights. But es...
by Dietger
Thu Nov 28, 2013 2:30 pm
Forum: Links & Papers
Topic: Joint Importance Sampling of Low-order Volumetric Scattering
Replies: 8
Views: 12109

Re: Joint Importance Sampling of Low-order Volumetric Scatte

Cool paper! Tiny question; when you make a comparison with 'traditional path tracing', did you include the contribution of random walks hitting the light sources directly in there with MIS or did you rely completely on next event estimation? Maybe you mentioned it somewhere but I missed it. Includin...
by Dietger
Tue Nov 26, 2013 5:04 pm
Forum: General Development
Topic: Heckbert ray grammar and today BRDF
Replies: 2
Views: 3636

Re: Heckbert ray grammar and today BRDF

The research community has secretly agreed to ignore glossy materials, too complicated. Now that you are in on this secret.... don't tell anyone! :D Seriously though; In the context of MLT 'D' usually just stands for everything-that-is-not-'S'. Some people use a special symbol such as 'G' to identif...