Search found 89 matches

by friedlinguini
Tue Jan 07, 2014 10:57 pm
Forum: General Development
Topic: Population Monte Carlo Sampling
Replies: 14
Views: 11308

Re: Population Monte Carlo Sampling

I found a somewhat later paper (http://pages.cs.wisc.edu/~yu-chi/resear ... r-egsr.pdf) to be intriguing, as it tries to combine PMC and ERPT.
by friedlinguini
Fri Dec 06, 2013 5:22 am
Forum: General Development
Topic: How to do depth of field in Light tracing?
Replies: 3
Views: 4264

Re: How to do depth of field in Light tracing?

I haven't tried it myself, but I imagine you pick a random point on your lens, connect to the surface point, and then calculate pixel coordinates based on where the segment formed crosses the focal plane
by friedlinguini
Tue Dec 03, 2013 4:45 pm
Forum: Visuals, Tools, Demos & Sources
Topic: ket is for horses
Replies: 4
Views: 9288

Re: ket is for horses

Maybe the horses understand it better than we do.
by friedlinguini
Sun Nov 17, 2013 3:56 pm
Forum: General Development
Topic: About volumetric caustics.
Replies: 23
Views: 19052

Re: About volumetric caustics.

What about photon mapping. I knew that it can produce noiseless images fast. But it's not recommended? Not recommended by who, and for what? There are some things that photon maps are good for (avoiding noise, rendering LSDSE light paths, ease of implementation), and some things that they are less ...
by friedlinguini
Sun Nov 17, 2013 3:28 pm
Forum: General Development
Topic: Working Color Spaces
Replies: 11
Views: 10702

Re: Working Color Spaces

They use XYZ to add up their sampled spectra per pixel, i.e. when R is their radiance sampled on a primary ray upon a pixel, they convert R to XYZ to build an average R/n for that pixel. The nice thing about XYZ is that it has a built-in luminance measurement. In PBRT 1 they used the luminance info...
by friedlinguini
Sat Nov 16, 2013 6:15 pm
Forum: General Development
Topic: Working Color Spaces
Replies: 11
Views: 10702

Re: Working Color Spaces

Adding XYZ colors and Spectral colors (of same topology) satisfy that. But which other color spaces exist that do that? Which RGB color space do that? Is sRGB a linear and additive? sRGB is not linear. It is very close to linear RGB with a 2.2 gamma correction. I also realise that PBRT has switched...
by friedlinguini
Fri Nov 15, 2013 2:41 am
Forum: General Development
Topic: About volumetric caustics.
Replies: 23
Views: 19052

Re: About volumetric caustics.

Is it really that simple?! I am using a QRNG already. I am using sobol sequence. Is MLT just a matter of replacing the RNG?! There's more to it than that, but not much. There's the warm-up that I mentioned, you let the RNG dictate where to place samples rather than iterating over pixels, and you ha...
by friedlinguini
Thu Nov 14, 2013 5:31 pm
Forum: General Development
Topic: About volumetric caustics.
Replies: 23
Views: 19052

Re: About volumetric caustics.

What mumbo-jumbo is that? Kelemen-style MLT doesn't require much. You need to to feed sample results back to the random number generator, and let the thing warm up a bit to generate an average intensity and eliminate start-up bias. Otherwise it's not really any more complicated than, say, replacing ...
by friedlinguini
Wed Nov 13, 2013 7:37 pm
Forum: General Development
Topic: About volumetric caustics.
Replies: 23
Views: 19052

Re: About volumetric caustics.

You might take a look at Wojciech Jarosz's (no idea if that's the right way to write the possessive. :-) ) work ( http://zurich.disneyresearch.com/~wjarosz/publications/ ). A lot of it is photon map-like structures specialized to volumetric scene elements. Listed in that link is also a hot-off-the-p...