[vtkusers] Multiple renderes and interactor callback

David Gobbi david.gobbi at gmail.com
Mon Sep 8 08:40:16 EDT 2014

Hi Ali,

If you are using a parallel projection, then the zoom factor is
inversely proportional to the ParallelScale.

If you are using a perspective projection (the default), and if
your zoom interaction is being done by moving the camera
in and out, then the zoom factor is inversely proportional to
the camera Distance.

In other words, to synchronize the zoom, you generally want
to copy the ParallelScale and the Distance.

Note that in all of the discussion above, I've been using a
loose definition of "zoom factor", since the precise camera
definition of "zoom" relates to ViewAngle, not Distance.

 - David

On Sun, Sep 7, 2014 at 11:27 PM, sfaisalali91 <sfaisal.ali91 at gmail.com> wrote:
> hey David,
>  I was able to fix the problem and i am able to rotate the volume to a
> desired angle of rotation based on MPR slicing and also rotate it
> independently. Thanks for the help.
> Now i am trying to synchronize the zoom functionality on all the three
> viewports (Zoom should takes place simultaneously on three viewports). i
> tried setting active camera of one viewport to another. As MPR slicing is
> involved, it changes the whole orientation  of all the three vieports.
> <http://vtk.1045678.n5.nabble.com/file/n5728602/MPR_SetActiveCamera.jpg>
> is there any way to calculate the zoom factor ?? Can you please guide me.
> Thanks in advance.
> Thanks & Regards
> Faisal Ali
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