[vtkusers] Overlaying contours on DICOM image

[David Gobbi]

Hi Nick,

I haven't used dicom contours specifically, but in general whenever I do any
work in VTK where coordinate systems are important, I avoid any use of
the 2D rendering classes.  After all, VTK's claim to fame is 3D
visualization.
With 3D data and 3D actors (i.e. classes derived from vtkProp3D), you can
use the UserMatrix property of the actor to get the actors in the right
position.

A tricky part of rendering images via 3D actors such as vtkImageActor or
vtkImageSlice is proper positioning of the VTK camera.  But the overall
flexibility of 3D rendering far outweighs the convenience of 2D rendering.

 - David


On Thu, Mar 12, 2015 at 3:45 PM, Nick Patterson <pattersonnp.work at gmail.com>
wrote:

> Hi,
>
> I have been using the
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/IO/ReadDICOMSeries example to
> read a CT series. I have also been using the vtkGDCMPolyDataReader to read
> in structures from DICOM file. I would like to take the 2D slices from the
> polydata (effectively contours) and overlay them on the respective CT
> slice. I wondered if anyone can provide guidance on how to do this? I have
> tried multiple things, such as vtkPolyDataMapper2D, vtkActor2D etc, but not
> really making much progress.
>
> Regards, Nick.
>
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