[Bf-cycles] Optimization project

[Brecht Van Lommel]

I've added these to the list now. We do already importance sample the
hair BSDFs, but I'm sure this can be improved. Dual scattering would
be interesting to add as a quicker way to do indirect light.

On Sun, Feb 9, 2014 at 7:00 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.
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>> Bf-cycles at blender.org
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>
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