[vtkusers] Multi Touch input in VTK?

[David Gobbi]

VTK will support multi-touch quite easily.  The way that multi-touch works
is that the driver of the multi-touch device translates each multi-touch
"action" into a GUI event that is sent to the application.  So a two-finger
drag becomes a "scroll" event for the application, etc.  At no time does the
application "see" the multiple finger actions, it just sees a single event.

The x11 "synaptics" driver provides support for multi-touch (though it only
supports two-finger scrolling and the various taps for now).  The driver can
map gestures to any of the five buttons and five modifiers or to the
mousewheel.  These "button" events can then be used by the application to
perform rotation, zoom, or what have you.

In summary, support of multi-touch is really a driver issue.  No changes to
VTK are needed at all, it does everything that is needed for multi-touch,
and if e.g. you write a VTK application for the MacBook you can take full
advantage of the multi-touch trackpad.

    David


On Sun, Oct 11, 2009 at 8:49 AM, Wagner Sales <wsales at gmail.com> wrote:

> Hi,
>
> I don't think VTK haves a support in multi touch. To do this, have
> some issues coming from the multi platform approach. For example, I
> don 't know a support for multi touch in X11, which are used by a lot
> of UN*X platforms. Then, I think this support doesn't exist yet and
> will not coming soon.
>
> Regards,
>
> Wagner
>
> 2009/10/11 bkchng <bkchng at gmail.com>:
> >
> > Hi,
> >
> > I'm a new user of VTK, currently experimenting with the use of it to
> develop
> > a 3D model viewer that is able to take in multi touch input from CCV,
> > through the TUIO client TUIO CPP.
> >
> > Has anyone managed to make VTK accept input from multiple points? e.g.
> for
> > multi touch, you can use 2 fingers to either zoom in or rotate an object,
> > whereas currently the VTKRenderWindowInteractor only takes in
> > mouse/trackball/joystick input. I'm not too familiar with VTK so I was
> > hoping someone could start me off somewhere.
> >
> > Thanks so much for reading!
> > --
> > View this message in context:
> http://www.nabble.com/Multi-Touch-input-in-VTK--tp25781875p25781875.html
> > Sent from the VTK - Users mailing list archive at Nabble.com.
> >
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