I have some code that creates OSG boxes and applies materials to the
geodes containing those boxes. It creates a flat scene graph (for now)
with an osg::Group root node and an osg::MatrixTransform attached to the
root node above each geode.
I've noticed a huge frame rate reduction when I turn on the material
assignment part of the code, which basically goes like this:
osg::ref_ptr<osg::Material> material = new osg::Material;
...set material colors & static data variance...
osg::StateSet *stateSet = geode->getOrCreateStateSet();
...set material attribute and static data variance...
Here's where it gets weird (for me anyway):
If I do the following...
1. set the rendering hint to DEFAULT_BIN
2. attach a node loaded with osgDB::readNodeFile (cow.osg will do) to
the root node
...then the performance shoots up to where I want it to be.
If I set the rendering hint to OPAQUE_BIN, I do not get the performance
boost after loading a file.
I think that either the OSG file or the loading code are setting some
states that I need to get my performance back up, but I can't figure out
which ones. I've tried a lot of different settings to match up to
cow.osg. Display lists are turned on for the drawable, culling is
turned on for the geode, and I've enabled all culling for the camera.
I've set CULLFACE both on & off for the StateSet and set DataVariance to
STATIC wherever I can.
Any ideas? I assume this is an easy fix, but I'm clearly missing something.
Thanks,
Todd
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