[Bf-cycles] build with OSL support

[Brecht Van Lommel]

I think it should converge to the same result when roughness is zero?
At least in blender internal this seems to be the case. Also, looking
at your code: when sigma = 0, we get m_a = 1 and m_b = 0. As a result,
all that is left is nl/M_PI, i.e. a regular diffuse BSDF?

Brecht.

On Wed, Nov 9, 2011 at 4:27 PM, Yasuhiro Fujii
<y-fujii at mimosa-pudica.net> wrote:
> pros:
> + Simplify the UI.
> + Simplify the code.
>
> cons:
> + oren_nayar() and diffuse() have different convergence behavior even
> if roughness == 0.0, yield very different looks if convergence is not
> sufficient. In some scene, designers may want to choose oren_nayar()
> even if roughness == 0.0.
> + Thus users must know roughness = 0.0 is specialized.
>
> I can't decide it because of my poor experience, especially designer's side.
> What do you think about their cons?
>
>
> On Wed, Nov 9, 2011 at 11:37 PM, Brecht Van Lommel
> <brechtvanlommel at pandora.be> wrote:
>> Hi,
>>
>> What do you think about implement this as a Roughness input for the
>> Diffuse BSDF node, instead of a separate one? Internally it can still
>> be a separate closure/BSDF, but it could just check if(roughness ==
>> 0.0) diffuse() else oren_nayar().
>>
>> Brecht.
>>
>> On Wed, Nov 9, 2011 at 6:55 AM, Yasuhiro Fujii
>> <y-fujii at mimosa-pudica.net> wrote:
>>> The O-N patch must be updated, however, the compile errors don't seem
>>> to be caused by this patch. I guess that they are due to tomato branch
>>> merged.
>>>
>>> Blender's source (including cycles) will be changed a lot this week,
>>> due to a Branch Merger hurricane week:
>>> http://www.blendernation.com/2011/11/07/developer-meeting-notes-november-6-2011/
>>>
>>> I will update the patch when cycles get to be able to compile again.
>>>
>>>
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