[osg-users] dumptruck.osg and GL ES 2.0

[Sebastian Messerschmidt]

Hi Jens,

Can you disable the optimizer (there is some environment variable to 
disable it globally, but I don't recall the exact name) and see if the 
issue remains? Can you provide a stats-screenshot so we can see what 
might be going on?

Cheers
Sebastian
> Hi,
>
> I was trying to build a demo scene with our OSG (3.2 branch until 
> commit 44cf6b92d2) (OpenGL ES 2.0) and I noticed that when I load 
> dumptruck.osg (from 
> https://raw.githubusercontent.com/openscenegraph/osg-data/master/dumptruck.osg) 
> into osgviewer, the GL drawing operations seem to generate a heack of 
> a lot of calls to glDrawArrays (GL_TRIANGLE_STRIP, some_offset, 3), so 
> rendering each trianlge separately, causing a huge load on the system.
>
> Is that expected to happen or is there something odd with our 
> configuration or is that a bug?
>
> KR, Jens.
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