[vtkusers] Re : Displaying points on a 2D image

[Prathamesh Kulkarni]

How about using the vtkSeedWidget for placing points?

Here is an example:
http://www.vtk.org/Wiki/VTK/Examples/Widgets/vtkSeedWidget


Prathamesh

Message: 3
Date: Fri, 23 Jul 2010 04:31:17 -0700 (PDT)
From: Malsoaz James <jmalsoaz at yahoo.fr>
Subject: [vtkusers] Re :  Displaying points on a 2D image
To: vtkusers at vtk.org, Trystan Louboutin <tanstry at gmail.com>
Message-ID: <151153.72822.qm at web28312.mail.ukl.yahoo.com>
Content-Type: text/plain; charset="iso-8859-1"

Hi,

I have been facing similar problems few weeks ago.
A solution has been to create a vtkImageData for each set of points I had
(in my case, it was contours). Then, I have used a vtkTexture to paste the
vtkImageData on the image (which was also a texture).
To my mind, this isn't ideal at all, but I didn't find any other solutions
and I'm still looking for something else.

I hope someone could help us with this issue.

Best
James

--- En date de?: Mer 21.7.10, Trystan Louboutin <tanstry at gmail.com> a
?crit?:

De: Trystan Louboutin <tanstry at gmail.com>
Objet: [vtkusers] Displaying points on a 2D image
?: vtkusers at vtk.org
Date: Mercredi 21 juillet 2010, 17h13

Hi vtk users,

I want to display some points over a 2D-image, it displays fine but the
problem is that the points and image are not linked together.
In fact, I want the points to be associated with the image so that zoom
in/out will affect the image either the points, which is not the case
actually.

The image is obtained by re-slicing a vtkData volume as vtkImageData and
displayed in a QVTKWidget.

For displaying the points, I use :
vtkPoints : defines the points
vtkCellArray : to link points

vtkPolyData : setPoints( theVtkPoints ) - setVerts( theCellArray )
vtkActor2D
vtkPolyData2DMapperAdd the actor to the renderer (same as image)
The points (ie, representing a contour) are visible over the image but not
superposing it correctly (coordinates are mismatching).


I would like to know how to display some points (displayed in different
colors) on a vtkImageActor ?
Is the vtkImageActorPointPlacer suitable for this kind of thing ? I can't
find any satisfactory example on how using it in such a case...


Thanks in advance for any help,

Regards,
Trystan





-----La pi?ce jointe associ?e suit-----

______________________________
_________________
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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20100723/a036b539/attachment.htm>