What's the internal oppinion about thread safety issues? The scenegraph methods do not claim to be threadsafe in any way, do they?
I'm asking because of the temporary vectors, stored in (static) fields, to avoid creation of object in computational methods - they do destroy thread safety…
As I've gone through things, I've tried personally to make it less reliant on static fields. In my opinion, creating and manipulating the scene graph objects themselves should be thread safe. Methods that are purely render specific do not have to be since they can only be run single threaded.