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Memory Management
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osg::ref_ptr<> - smart pointer than automatically ref()/unref() objects that it points to
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osg::Referenced - ref(), unref() & protected virtual destructor
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osg::Object - is a osg::Referenced, adds copy constructor with osg::CopyOp, className() etc
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Maths
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osg::Vec2 - typical used for tex coords
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osg::Vec3 - typical used for coordinates and normals
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osg::Vec4 - typical used for RGBA colors
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osg::Quat - typical used for...rotations
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osg::Matrix - 4x4 float matrix