[CHANGE] - setting a default bounding sphere for all root nodes ensures that...
[CHANGE] - setting a default bounding sphere for all root nodes ensures that the intial camera always shows the complete data box (in our case this 255x255x255 box). This is implemented dirty since we do not have a class managing our reference coordinate system! Hopefuly this solves the problem of needing to press space to see the scene completely.
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