For Zooming on a Mac (one button mouse) it appears to me that 
Shift-Drag-Left-Button is the only way. But I find it very cumbersome to 
have the Z rotations tied to the left-right drag, since I can rarely drag 
perfectly up-down for a pure zoom. I am unable to do a pure zoom without 
inadvertantly rotating around Z. Frustrating!

On Windows, the scroll wheel is perfect for Zoom and avoids this frustration.

Am I missing some trick on the Mac?

I suggest (for Macs) that Z rotation be removed from Shift-Drag (only 
button), or else that a double shift be enabled to disable the Z rotation, 
such as Shift-Alt-Drag (which seems to be unused).

This would mean we need a new mouse gesture for Z rotation. How about 
Alt-Drag since that appears to be unused?

Sorry if this issue has already been beaten to death and I missed it. 
Wanted to put in my two cents before v11 comes out.

Thanks, -Eric

----
Eric Martz, Professor Emeritus, Dept Microbiology
University of Massachusetts, Amherst MA US
http://www.umass.edu/molvis/martz


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