[R] rgl plot rotation with device other than mouse

[santiago gil]

Hello R,

I'm trying to figure out if it would be possible use a device (maybe simply
a trackball) separate from the mouse that would have the ability to rotate
a 3D plot made with rgl without any buttons. This is to build an
interactive "demo"-like piece for which a mouse or trackpad is an
unsatisfactory manipulation tool. The worse solution would be to make the
trackpad button "sticky" so that it works as a rotation on/off toggle.
Anything that is less intrusive with the computer's operability is even
better. I couldn't find the right way in par3d or anything of the sort. Any
tips anybody? Or any other libraries to would use to do something like this?

Thanks!

Santiago
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