[Bf-cycles] Enabling hair rendering on GPU?

[Tobias Oelgarte]

As i said. You are right to not enable it by default because of the lost 
performance, but if i want to use hair for a project, then I don't care 
that this blender build is slower then others, if it is still faster to 
render scenes with hair and slowdown on GPU as on CPU.

I would be very happy if this would be just an build option. But 
currently i couldn't figure out how to make it work at all. There are a 
lot of tiny things to change to make it work (editing header files, 
changing python scripts [make dialogs appear], etc.). So i guess i 
always missed some detail to get it working.

Am 16.02.2013 19:47, schrieb Brecht Van Lommel:
> I understand hair rendering on the GPU may be faster than the CPU,
> that's not what I'm talking about. The slowdown happens on scenes
> where there is no hair, so this would significantly slow down GPU
> rendering for everyone even if they are not using hair, which is not
> acceptable.
>
> Anyway we'll try to solve it for next release and I guess there could
> be a build option for it, but currently we can't enable it for
> official builds because of this.
>
> On Sat, Feb 16, 2013 at 6:37 PM, Tobias Oelgarte
> <tobias.oelgarte at googlemail.com> wrote:
>> For me it was still faster to render with GPU and the mentioned slowdown
>> as to render only with CPU. That means: Even if it makes Cycles slower
>> on the GPU it is still quite a bit faster as to render on CPU. I would
>> really like to have the option (maybe an own build option) to enable GPU
>> hair rendering, even if i have to consider the slowdown.
>>
>> Am 16.02.2013 18:20, schrieb Brecht Van Lommel:
>>> The problem at the moment is that it slows down GPU rendering
>>> significantly even when there is no hair in the scene, due to the
>>> extra complexity of the kernel. So that would need to be solved before
>>> it can be enabled.
>>>
>>> On Sat, Feb 16, 2013 at 5:19 PM, Tobias Oelgarte
>>> <tobias.oelgarte at googlemail.com> wrote:
>>>> Hello,
>>>>
>>>> i was using an older build with the first patches of the hair rendering
>>>> feature together with my GPU. But currently it is only available for
>>>> CPU, despite the fact that it was working just fine. Could we (re)enable
>>>> the hair rendering again for the GPU inside the experimental feature
>>>> set? I would really like to test it out, even if it would be unstable.
>>>> It would also help to file bug reports to make it work, if it not
>>>> already does.
>>>>
>>>> Greetings from
>>>> Tobias Oelgarte
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