[Sidefx-houdini-list] GPU refresh issues (win x64)

Gregory Karydis nutman at otenet.gr
Tue Feb 20 22:57:58 EST 2007

Found a solution!
[Many thanks to Jeff Wagner for the eye-opener]
The environment variable trick works (albeit slow as already mentioned) but 
it helped me to a great extent to identify the source of the problem.
nVidia drivers for non Quadro GPUs have a bizzare way of handling the OGL 
The solution came in the form of RivaTuner.
With that ever so useful app you can force the nVidia driver to work in 
compatibility mode while using all of it's resources so you get no lag 
This works with any Forceware drivers out there and can be applied to any 
version of windows from Win XP to Vista 32bit or 64bit.
In effect it uses the same environment variable but instead of running from 
the CPU it runs from the GPU.

Since this works rather well, I will make a step by step guide and post it 
in the forums one of these days.


----- Original Message ----- 
From: "Jeff Wagner" <jeff at sidefx.com>
To: <sidefx-houdini-list at sidefx.com>
Sent: Tuesday, February 20, 2007 11:00 PM
Subject: Re: [Sidefx-houdini-list] GPU refresh issues (win x64)

> When Windows XP boots in to safe mode, the default graphics drivers are
> bypassed as you know. Windows XP has OpenGL embedded in it and will run
> in software only mode in safe mode.
> You can bypass the hardware OpenGL acceleration by setting the
> environment variable:
> Do a search on the Side Effects forum for enabling software acceleration
> (disabling hardware acceleration).
> -jeff
> On Tue, 2007-20-02 at 21:25 +0200, Gregory Karydis wrote:
>> had a few power outages during the day and the system in question had
>> to
>> boot in safe mode after shutting down ubruptly.
>> While in safe mode and ready to restart my computer normally I thought
>> "why
>> not?" and fired up Houdini which miraculously performed without a
>> hitch and
>> without the annoying refresh issue.
>> I think it's all down to the drivers after all.
>> I will document my progress in case someone else has the same problem
>> in the
>> future.
> -- 
> Jeff Wagner, jeff at sidefx.com, Senior Technology Consultant
> Side Effects Software, www.sidefx.com, Toronto, Ontario, M5V 3E7
> tel: (416) 504-9876, fax: (416) 504-6648
> OldSchool Blog:
> http://www.sidefx.com/index.php?option=com_content&task=blogcategory&id=115&Itemid=216
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