[Bf-cycles] GSoC - Spectral Rendering

[Gavin Howard]

     Thomas,
     Rest assured that it will be optional. In this project, I intend
to learn as much of the Blender codebase as I can, including the UI,
so I will try to integrate as best I can into Cycles and by extension,
Blender.
     God Bless,
     Gavin H.


On Apr 9, 2013 8:46 PM, "Thomas Dinges" <blender at dingto.org> wrote:
>
> Hi,
> I have to say I like the idea.
>
> Spectral rendering can give more accurate results and if (that would be a condition imho) the feature can be added to Cycles in a nice way, as a UI option, all fine.
> It should be optional, so people who do not need it, don't suffer from longer render times.
>
> Best regards,
> Thomas
>
> Am 10.04.2013 03:36, schrieb Agustin Benavidez:
>
> Hi, my humble opinion is that this idea somehow doesn't fit into the Cycles philosophy and focus which is be the best balance between speed and realism/accuracy and animation oriented, We already got great render engines capable of that integrated in blender like Luxrender, spending a Summer Of Code slot to re-do what others complementary OOS projects do best is not worth.
>
> Here is what you can already do with a relative simple node setup:
>
> http://www.youtube.com/watch?v=jMsW5gPqS6c
> http://www.blendswap.com/blends/view/39307
>
> I understand dispersion is not only about little rainbows, but I agree with Dalai, and don't see this improving Cycles general usage.
> Anyway We need to be open and will be nice to see some examples of the quality boost that this could bring :)
> Best regards.
> Agus
>
>
>
> 2013/4/9 Gavin Howard <gavin.d.howard at gmail.com>
>>
>>      David,
>>      Cycles has a subsurface scatter node in the development builds,
>> correct? If that's the case, I will see if I can render some scenes in
>> Cycles and LuxRender to show the difference. It's not going to be the
>> best, but it should show something.
>>      Gavin H.
>>
>> On Tue, Apr 9, 2013 at 5:20 PM, David <erwin94 at gmx.net> wrote:
>> > On Apr 10, 2013, at 12:55 AM, Brecht Van Lommel wrote:
>> >> On Wed, Apr 10, 2013 at 12:08 AM, David <erwin94 at gmx.net> wrote:
>> >>> this is by far the best visual explanation of what separates spectral
>> >>> rendering from normal RGB rendering that I have seen:
>> >>>
>> >>> http://www.luxrender.net/wiki/LuxRender_Textures_Spectrum#Gaussian_spectrum
>> >>>
>> >>> All lamps in this image would be the same RGB color, and produce the
>> >>> same result with non-spectral rendering.
>> >>
>> >> I don't think that's true? The exact result depends on the wavelength
>> >> to RGB conversion function, but a wider gaussian distribution across
>> >> the wavelength should give different RGB values than a narrow one? As
>> >> the distribution gets wider there will a more even distribution across
>> >> the RGB channels.
>> >>
>> >> It wouldn't be as accurate but the lights would still render different I think?
>> >>
>> >> Brecht.
>> >
>> > Ah, you're right, and it is even sort of explained in the text I linked to, so I
>> > feel especially dumb. ;)  The width of the distribution corresponds roughly to
>> > saturation, it's basically just HSV.
>> > So, the only effect that I can think of that is really not approximated by RGB
>> > rendering is dispersion? I would love to see an image where the light spectrum
>> > makes a noticeable difference, that isn't of a prism or a diamond...
>> >
>> > till then, David.
>> >
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> --
> Thomas Dinges
> Blender Developer, Artist and Musician
>
> www.dingto.org
>
>
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