<snip>
> Looking at the framerates it looks like you have sync to vblank enabled.
> That is generally a bad idea for benchmarking, as small differences in
> actual speed can have a very big effect on framerate. Try to rerun the
> tests with that turned off.
Ok, I will try that. To be honest I never heared about it. I guess
it's someting related to the graphics card?
Syncing to vblank only renders frames that will show up on your monitor.
For example, some LCD panels run/display at 60HZ and if your graphics card
can render at 150HZ there are a lot of wasted(never shown) frames.
I'm surprised about the loading times for obj. That looks quadratic to
> me, which I wouldn't have expected. If you could put the models up that
> would be helpful.
I was surprised too! The biggest file needs more than 8 hours to be
loaded! I created the wrl-files by referencing to the same tie.wrl 729
times, each time with a slightly different translation. Then I loaded
the files into 3DMax 8 and exported them to obj. This is why the
tie792.wrl is just a few KB small, while the corresponding tie792.obj
is about 180 MB big. However, I used exactly the same files for OpenSG
with obj and OpenSceneGraph.
> Just to rule out simple things: I assume you used optimized libs for
> everything?
Yes I did.
One more thing to check for is OSG would optimize the scenegraph by default
with some of their sample apps. This optimization should be turned off.
This would affect the models with lots of references.
The tie is a pretty small model, i.e. few polygons/node, which leads to
> putting more weight on traversal than rendering. In that arena I'm not
> very surprised OSG has an advantage, as it has a simpler structure. I
> wouldn't expect a factor of two, but that might be caused by the vblank
> issue.
I also think I should repeat the test with another model.
I would find a small collection of models to compare....not just taking a
small one and multiplying.
Check here: http://opensg.vrsource.org/trac/wiki/SampleData
-Dan
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