OSG 3.4 adds the ability to place Drawables directly in the scene graph, without a Geode decorating them. Leveraging this should give a small performance boost, because the redundant Geodes increase culling overhead.
There is still an oustanding issue with the RemoveDrawableVisitor no longer working correctly, because Drawables can have multiple parents.
Works around a compiler warning with OSG 3.4:
warning: base class 'class osg::Callback' should be explicitly initialized in the copy constructor [-Wextra]
With no default argument for osg::CopyOp&, the compiler no longer sees the function as a real copy constructor and stops warning about the missing virtual initializations.
We don't care about this warning because there is nothing interesting to initialize in the osg::NodeCallback base anyway.
A proper fix for the warning would require to inserting OSG_VERSION conditional compiling all over the place, that is as long as we are still supporting OSG 3.2.
Nvidia drivers only support a maximum of 4 fixed function texture units. To resolve this problem, bind texture units in order instead of binding to the NiTexturingProperty::TextureType unit.
The Material state is now set on the NiTriShape's node rather than the Geode, thus merged with other state like NiTexturingProperties, etc that are typically attached to the NiTriShape.
Effectively cuts in half the number of StatSets for a NIF file, resulting in big speedup (~10%) in the Cull and Draw phases.
scrawl
Arthur Moore