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

[Robert Osfield]

Hi Wener,

On 28 March 2017 at 16:24, Werner Modenbach <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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