[vtkusers] Magnify Glass

[Karthik Krishnan]

There is a full fledged application that does this : Slicer. It puts
the magnified part in a separate render window.

There are other not-directly but similar examples in VTK. See the
vtkAxesActor for instance. It creates an overlay renderer and places
the axes prop on a corner of the render window. It shares the same
camera of course deliberately so as to have the orientation reflect
that of the scene, but you needn't.

--
karthik

On Thu, Jan 28, 2010 at 9:59 AM, Gerrick Bivins
<gbivins at objectreservoir.com> wrote:
> Is there an example/test of this somewhere?
> Gerrick
>
> On Thu, Jan 28, 2010 at 7:02 AM, Karthik Krishnan
> <karthik.krishnan at kitware.com> wrote:
>>
>> yes.. the typical way is to display a zoomed version the image, using
>> a second camera on a corner of the renderwindow, usiing a separate
>> overlay renderer, or to display it on a separate smaller render
>> window.
>>
>> Having a hovered region over the scene itself will just slow the
>> rendering of the scene itself down as you move the cursor and is
>> usually not practical.
>>
>> --
>> karthik
>>
>> On Thu, Jan 28, 2010 at 7:52 AM, Kenneth Porter <shiva at sewingwitch.com>
>> wrote:
>> > --On Wednesday, January 27, 2010 11:17 PM -0800 circass
>> > <circass at gmail.com>
>> > wrote:
>> >
>> >> how can i make a magnify glass ?
>> >
>> > Sounds like you want a second camera.
>> >
>> >
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