* If the eyepoint and cylinder axis are close to parallel (given some tolerance), then it uses a plane perpendicular to the cylinder axis.
* Otherwise it uses a plane parallel to the cylinder axis oriented towards the eyepoint (previous behavior). This gives decent behavior and is the only path that was taken in the previous code. I kept with previous behavior and that allowed a good bit of code to be removed, simplifying things. There is now no need for the _onCylinder flag, but since there is a public accessor, I wasn't sure how to handle it for backwards compatibility, so I left it in. NOTE - there is no default initialized value, so if it is kept in, it should be set to 'false' to keep same behavior as before. I am not quite sure how the _onCylinder case was supposed to behave as even forcing that path gave undesirable behavior, even with carefully controlled dragging.
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