[chimerax-users] Trackpad scaling causes unintended rotation

[Tom Goddard]

Hi Oliver,

ChimeraX Mac trackpad pinch and two finger rotation both occur simultaneously.  Chimera 1.15 seems to behave the same except that Chimera twist sensitivity is less.  I see in the ChimeraX code the twist speed factor is 6, meaning one full twist rotation would cause the model to rotate 6 full turns.  This was intentional to make twist rotation adjustments less cumbersome.  The Chimera 1.15 twist speed factor seems to be 2.  Currently there is no command or preference setting to change just the twist speed.  There is a ChimeraX trackpad preference to change the overall sensitivity but it will effect both pinch zoom and twist so won't help you zoom without twisting.

	Tom

> On Sep 29, 2021, at 12:42 PM, Oliver Clarke via ChimeraX-users <chimerax-users at cgl.ucsf.edu> wrote:
> 
> Hi,
> 
> In recent versions of ChimeraX (I don't think it always did this but can't be 100% sure), when one uses pinch-to-zoom on the trackpad to scale the view, this also changes orientation, causing quite a large and unintended rotation which can be a bit disconcerting. Comparing directly with Chimera using the same model, this does not happen in Chimera. 
> 
> Is there some difference in how the Chimera vs X are interpreting competing trackpad gestures, and could this be adjusted in ChimeraX? Because two fingers can be used both to scale and rotate... Chimera seems to be able to figure out which the user is intending, while ChimeraX presently applies both at the same time.
> 
> Cheers
> Oli
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