===== Mouse and Keyboard commands =====
  * Left-MouseButton + Mouse          —> Slide in Z to Focus
  * Right-MouseButton + Mouse         —> Turn in X/Y around Focus
  * Right-MouseButton + MouseWheel    —> Turn in Z around Focus
  * Left-MouseButton + LCTRL + Mouse  —> Move Focus in Z to you
  * Right-MouseButton + Mouse-move    —> Move Focus in X/Y around you
//Most nodes have an optional camera. The camera can be configured to follow moving objects and focus on possibly different moving objects.//

//When an object in the tree is selected, the camera and level of visual detail is taken from the node at or above the selected one, where the visual-detail and/or camera are enabled.//

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