Hi,

You'll need to add two things to the geode or drawable's state set:

- An osg::BlendFunc with the proper arguments for the blend you want
- Calling setRenderingHint() with osg::StateSet::TRANSPARENT_BIN so it's in the 
proper render bin

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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=45101#45101





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