Viewer: recursively parsing whole scene graph
Viewer: recursively parsing whole scene graph

If more objects share the same mesh, the mesh is processed only once.
Currently the same material is applied to all objects and only mesh
instances are processed.

Squareys/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,Squareys/magnum-examples,mosra/magnum-examples,Squareys/magnum-examples,mosra/magnum-examples,Squareys/magnum-examples