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traversing the PMVMatrix throughout childs (-> see TreeTool).
Utilizing the Vec*f (and Matrix4f) API w/ AABBox et al renders our code more clean & safe,
see commit 15e60161787224e85172685f74dc0ac195969b51.
A Group allows to contain multiple Shapes,
hence the PMVMatrix must be traversed accordingly using TreeTool
for all operations (draw, picking, win->obj coordinates, ..).
Hence Scene + Group are now implementing Container
and reuse code via TreeTool and a Shape.Visitor*.
This will allow further simplification of user code.
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