Quaternion-style view control
Most 3D modeling software allow you to control the scene view with your mouse using two different "paradigms". One of them is to associate each mouse direction with two axes in the scene. The other paradigm, or control mode, is sometimes called "quaternion" mode. It rotates the scene taking in account the current rotation. It can be sometimes a little tricky to use, but this mode is nice because it allows you to eventually put the scene in whatever angle you would like.
I have the impression rviz does not allow this control mode, am I right? If it does, how do I set it up, and if not, should I open a feature request for it?
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