[Bf-cycles] Recent builds crashing - Cycles CUDA rendering

[Le Jardin Digital]

Hi
Apparently, there is a bug when saving rendered pictures with alpha 
channel and transparent backgorund on last multi-gpu builds...
( alpha doesn't exist and/or bad interpreted)...

Wolfgang Fähnle a écrit :
> Hi, may it is a good idea to test with the file from BA to get comparable  
> results,
> if you have the time :).
> http://blenderartists.org/forum/showthread.php?239480-2.61-Cycles-render-benchmark
>
> Cheers, mib
>
>
>
>
> Am 10.01.2012, 09:18 Uhr, schrieb Le Jardin Digital  
> <contact at lejardindigital.fr>:
>
>   
>> Hi
>>
>> this morning, i replaced the GTX 285 with the GTX470 from my other
>> machine ( s o that the system has 2 x GTX470 ) and results are here:
>> render time: 8.03 secs ( 10.3 secs with only one ( the fastest GTX470 on
>> PCIe 16x) ):
>> Not 2x ( it is normal because of the PCI express speed different: 4x and
>> 16x) but a real gain this time !
>> You were right, Thomas, about the GTX of the same generation...
>> i didn't have the time actually to test other scenes but perhaps results
>> will be better (because this one has a lot of bitmap mapping...)
>> Thanks
>>
>>
>> Le Jardin Digital a écrit :
>>     
>>> Hi
>>>
>>> thanks for the info but apparently the 43233 build didnt' have this  
>>> option.
>>>
>>> Just intalled the last build 43239 and this one has this menu. But:
>>>
>>> when i choose 'GTX470 and GTX285', rendertime is 15.23 secs
>>> whith only GTX470 selected, it takes only 10.2 secs...
>>> sure it will be improvments for future versions... anyway thanks again
>>> for this exeptionnal work.
>>>
>>> regards
>>> Vincent
>>>
>>> my system: GTX470 1.3gb + GTX 285 2gb / win 64 / drivers nvidia 285 whql
>>>
>>> Thomas Dinges a écrit :
>>>
>>>       
>>>> Hey,
>>>> yes it's inside the User Preferences. Go to the system tab there, there
>>>> is the Compute Device setting.
>>>> Choose CUDA and then in the drop down beneath which card(s) to use.
>>>>
>>>> Regards,
>>>> Thomas
>>>>
>>>> p.s Please dont sent mails as html to this list, thanks!
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>>>>
>>>>
>>>>
>>>>         
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>>>       
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