[Bf-cycles] BiDir con Cycles...

Brecht Van Lommel brechtvanlommel at pandora.be
Wed Nov 23 22:59:54 CET 2011


Actually there is no concrete plan to implement these things soon. My
first focus is getting this usable for rendering animations, not
architectural renders, for that a render engine like Luxrender may be
more suitable. Higher priority for me is things like render passes and
layers, more detailed scenes (displacement, subdivision, caching),
adaptive sampling, motion blur, ...

More advanced algorithms may get added at some point of course, and
perhaps someone other than me wants to work on them soon, but for e.g.
open movie projects it's not really feasible to use full global
illumination with caustics, very indirect light, etc, and get
acceptable render times.


On Wed, Nov 23, 2011 at 9:58 PM, ertuqueque <ertuqueque at gmail.com> wrote:
> Hi.
> Sadly I couldn't watch online the Cycles presentation on the Bconf. 2011, so
> maybe my questions were answered there... Anyway.
> I consider myself a "neophyte" on this area, so excuse me if I say something
> stupid...
> If I'm not mistaken, Cycles right now uses only Path Tracing to do the
> magic, which is easy to implement (especially on GPU) but really slow to
> converge on complex lighting scenes... I read somewhere that there are plans
> to improve the converce of Cycles by introducing Bidirectional Path Tracing
> + maybe MLT or ERPT implementations... Theoretically, this could improve by
> 2 or 3x the speed of Cycles...
> My questions are:
> 1.- Can you elaborate on this plan?... Just out of curiosity I'd like to
> know your perspective about PMC (Population Monte Carlo), BiDir, MTL, ERPT
> and/or any papers you want to base on...
> 2.- Can you give a loose estimate on when can we start seeing this stuff?...
> I know this is an annoying question, but right now I'm starting to use
> Cycles for commercial projects and though I'm LOVING IT, I'd certainly
> benefit from BiDir and so on...
> An example (45 minutes to render in a GTX 550 Ti, 4096 samples)...
> http://s5.postimage.org/9mjsycefr/Don_Melchor0001.jpg
> Thanks in advance.
> tuqueque.
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