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

[Malsoaz James]

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 écrit :

De: Trystan Louboutin <tanstry at gmail.com>
Objet: [vtkusers] Displaying points on a 2D image
À: 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 





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