[osg-users] Significant drop in frame rate when updating from OSG 3.2.1 to 3.4.0

Werner Modenbach Werner.Modenbach at texion.eu
Fri Mar 31 04:11:22 PDT 2017

Hi Robert,

the 3.4.0 tagged version is OK with the frame rate.
We discovered your commit in the 3.4 branch causing the problem:


From:RobertOsfield<robert at openscenegraph.com>
















The question is: Why is the viewer frame rate OK, even it is built with 
the same version we are using?
What are we doing different to the viewer?

Thanks so much for your excellent work!

- Werner -

Am 28.03.2017 um 18:22 schrieb Robert Osfield:
> Hi Wener,
> On 28 March 2017 at 16:24, Werner Modenbach 
> <Werner.Modenbach at texion.eu <mailto:Werner.Modenbach at texion.eu>> wrote:
>     I know it is actually not your duty giving help here but you are very
>     familiar with the driver calls and it would help a lot if you can
>     provide
>     an idea what kind of setting might cause this issue.
> I'm a very occasional Windows user so really don't have much 
> experience with Windows drivers to be able help with driver settings.
> It's a long shot, but have your tried the OSG-3.4 branch or OSG master 
> as these both contain a range of bug fixes/OSG improvements, there is 
> chance that something has changed that might fix things.
> Whatever the cause is it seems to be some small OpenGL state 
> difference between OSG-3.2 and OSG-3.4.0, I'm afraid I don't know what 
> this might be.  Perhaps using a 3rd party OpenGL debugging tool might 
> help here - capture all the GL calls for 3.2.x and 3.4.x and see what 
> the differences are.
> Robert.
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