[Bf-cycles] Optimization project

[Daniel Salazar - patazstudio.com]

Ok, I will very soon provide you with WIP scenes, at least to understand
why it is so scary slow :)

Daniel Salazar
patazstudio.com


On Sun, Feb 9, 2014 at 2:59 PM, Brecht Van Lommel <
brechtvanlommel at pandora.be> wrote:

> I don't have any great ideas to improve raytraced SSS performance,
> there's two tweaks we can do on the list now and general BVH
> performance improvements should help also. There's probably more we
> can do but I'm not sure what at the moment, analysis of some real
> world scenes should reveal some ways that it can be improved.
>
> On Sun, Feb 9, 2014 at 8:33 PM, Daniel Salazar - patazstudio.com
> <zanqdo at gmail.com> wrote:
> > We are using SSS for our very simple part of the teaser. A single
> character
> > on outdoors lighting. Its surprising how much of a speed penalty there is
> > with SSS :p Of course for a few seconds in the teaser it's alright  but
> I'm
> > foreseeing our project will be an SSS and hair frenzy!! :D
> >
> > On Feb 9, 2014 12:00 PM, "Marco G" <digitalbath86 at hotmail.com> wrote:
> >>
> >> Hi,
> >> about hair, haven't seen any specific paper link to help shading and
> >> rendering speedup.
> >>
> >> Is there anything already implemented so far, or other ideas?
> >> Reading at the pdf, the recent Importance sampling from Marschner et al,
> >> could be used in conjunction with Dual scattering,
> >> i remember reading in this mailing list, people willing to integrate
> dual
> >> scattering.
> >>
> >> Dual scattering -
> >> http://www.cemyuksel.com/research/dualscattering/dualscattering.pdf
> >>
> >> Importance sampling -
> >> http://cg.ibds.kit.edu/publications/pubhanika/2013_hairbrief.pdf
> >>
> >> A quote from the paper:
> >>
> >> "Our sampling scheme can be used for direct illumination sampling
> >> (where indirect illumination may be approximated by Dual Scattering
> >> [Zinke et al. 2008]) and also for indirect illumination, where
> >> sampling at each vertex of a random path is used to create photon
> >> maps within hair volumes [Moon et al. 2008] or within a variety
> >> of unbiased path-tracing algorithms"
> >>
> >> Thoughts?
> >>
> >> MG
> >>
> >>
> >> > From: brechtvanlommel at pandora.be
> >> > Date: Wed, 5 Feb 2014 17:02:11 +0100
> >> > To: bf-cycles at blender.org
> >> > Subject: [Bf-cycles] Optimization project
> >> >
> >> > Hi all,
> >> >
> >> > With Gooseberry coming up, it would be good to start focusing on (CPU)
> >> > optimization for the next few release cycles. For new features I still
> >> > plan to finish volume rendering and add deformation motion blur soon,
> >> > but besides that a more organized optimization project is something
> >> > I'd like to spend time on.
> >> >
> >> > See this wiki page for more details:
> >> >
> >> >
> http://wiki.blender.org/index.php/Dev:2.6/Source/Render/Cycles/Optimization
> >> >
> >> > There's already great work being done by Sv. Lockal and others in this
> >> > area, on the low level optimization front, but there's many more
> >> > opportunities. I'll try to add more detail and ideas over time, this
> >> > is just what I could think of off the top of my head.
> >> >
> >> > You can help out in various ways:
> >> > * Contribute code to implement optimizations
> >> > * Help gathering of test scenes representative of Gooseberry shots
> >> > * Suggest practical optimizations ideas
> >> >
> >> > It would also be cool if someone could set up some webpage with a
> >> > graph that tracks Cycles performance on test scenes over time, maybe
> >> > doing a render with the latest Git version once a week or so (like
> >> > http://arewefastyet.com/).
> >> >
> >> > Thanks,
> >> > Brecht.
> >> > _______________________________________________
> >> > Bf-cycles mailing list
> >> > Bf-cycles at blender.org
> >> > http://lists.blender.org/mailman/listinfo/bf-cycles
> >>
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> >>
> >
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