[Bf-cycles] CUDA Toolkit 6.5 and Volume on GPU

[Matthew Heimlich]

Hey Thomas,

Just a heads up, in your build with volumes enabled, MIS doesn't work for
environment lighting on the GPU. Turning it on just results in a black
background.


On Fri, Aug 22, 2014 at 3:46 PM, Martijn Berger <martijn.berger at gmail.com>
wrote:

> Hi Thomas,
>
> I think the move to cuda 6.5 and enabling volume are 2 issues and should
> be treated as such. I do however agree that we should do both.
> Ill update the buildbot to cuda 6.5. The cuda 6.5 cubins should work on
> older drivers ( pre 331 ) but it would be good to also test and verify.
>
> Best regards,
> Martijn
>
>
> On Fri, Aug 22, 2014 at 5:16 PM, Thomas Dinges <blender at dingto.org> wrote:
>
>>  Hi David,
>> thanks for the tests!
>>
>> * Equi-Angular and MIS is only implemented for Decoupled Ray Marching,
>> which we cannot enable on GPU yet due to Performance / Stability issues. I
>> will change the UI accordingly (for example disable the button when GPU is
>> used).
>>
>> * The performance drop when using a texture is to be expected, Decoupled
>> Ray Marching helps here quite a bit, I guess that's why CPU is faster in
>> that case.
>>
>> Best regards,
>> Thomas
>>
>> Am 22.08.2014 um 15:57 schrieb David Fenner:
>>
>> On GTX titan, mike pan test:
>>
>>  2.71 official                  27.62
>> vainilla cuda 6.5          28.07
>> volume cuda 6.5          28.25
>>
>>
>>  Notes: Was testing volumes and with a simple world volume and a lamp
>> now it's actually much faster than cpu (before gpu was crazy slow). Haven't
>> tested it with more complex scenes.  I noticed though that in gpu volume
>> gets always sampled as "distance" sampling, no matter the setting. Cpu
>> however respects the other settings (equiangular, etc). In distance gpu
>> much faster and its also faster when bounces are introduced, something that
>> in older builds really killed gpu performance.
>>
>>
>>
>>
>>
>> 2014-08-22 8:48 GMT-04:00 Tungerz <tungerz at gmail.com>:
>>
>>>  Probably nothing,
>>> I was upgrading my Cuda Toolkit to 6.5 (From 6.0)
>>> My Norton antivirus picked up a virus from file nppc32_65.dll =
>>> Suspicious.Cloud.7.F
>>> Anyone else on windows had this?
>>>
>>>  Great results, looks like a small price to pay for gpu volume and
>>> scatter.
>>> Worth ever bit of it :)
>>>
>>>  Cheers,
>>>  ~Tung
>>>
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>>>
>>
>>
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>
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