[vtkusers] flip 2D text

[David Gobbi]

I think that TextActor3D is the best solution, but it is not a trivial solution.

It would also require a separate overlay renderer (with EraseOff() and
InteractionOff()) and the overlay renderer would need to be set up for
a parallel projection where world coordinates and display coordinates
are equal to each other, except of course for your desired flip.  I.e.
you would put the camera behind instead of putting it in front.

The overlay renderer would be convenient to have in general, because
it would allow you to use whatever kind of 3D actors you want as an
overlay.  That way you won't have to mess around with 2D actors at
all.

   David


On Tue, Feb 16, 2010 at 12:28 PM, Eric E. Monson <emonson at cs.duke.edu> wrote:
> Hey Tamas,
>
> I'm not an expert in this, but after looking at it for a few minutes I have a feeling you'll need to either use a vtkTextActor3D in which you can do a SetUserTransform() (but the text would naturally move with your scene), or you could use something like a vtkTexturedActor2D and just reverse your text in the texture image.
>
> Hopefully someone else will have a better solution...
>
> -Eric
>
> ------------------------------------------------------
> Eric E Monson
> Duke Visualization Technology Group
>
>
> On Feb 15, 2010, at 6:21 PM, Tamas Ungi wrote:
>
>> Hi,
>>
>> I am developing an augmented reality system, where the image of the
>> monitor is looked at through a mirror. Therefore, I need to flip the
>> texts, but vtkTextActor seems to have only a SetOrientation function,
>> and I didn't find a way to apply a vtkTransform either.
>> Could you suggest a way to flip 2D texts on the monitor?
>>
>> Thank you,
>> Tamas
>> _______________________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>>
>> Please keep messages on-topic and check the VTK FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
>>
>> Follow this link to subscribe/unsubscribe:
>> http://www.vtk.org/mailman/listinfo/vtkusers
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers
>