Topology3D Update: add multiple particles rotations function (by mouse motion) to TopologyViewer3D * New behaviour: when ctrl is pressed, moving mouse (needn't click button) would cause selected particles (all particles if none of them is selected) rotate around their shared centre
Topology3D Update: add multiple particles rotations function (by mouse motion) to TopologyViewer3D
* New behaviour: when ctrl is pressed, moving mouse (needn't click button) would cause selected particles (all particles if none of them is selected) rotate around their shared centre

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