[vtkusers] vtk Coordinate system clarification

[Darshan Pai]

All visualization should be in WorldCoordinate space

On Mon, Apr 5, 2010 at 4:29 PM, Scott Johnson <Scott.Johnson at neuwave.com>wrote:

>  Hi Folks,
>
>
>
> I’m running into issues trying to spatially coordinate the display of
> images and polygons (spheres in this case).  My ultimate goal is to express
> all coordinates in the DICOM Frame of Reference.
>
>
>
> Right now I’m trying to display axial, sagittal, and coronal slices and the
> intersection of those image planes with spheres.  I’m using vtkImageReslice
> to slice the images, and vtkCutter to extract the contours of the
> intersection, but am running into problems getting the sliced polygons to
> show up in the right place with respect to the images.  I can get the
> spheres to display in the correct location in a MIP rendering.
>
>
>
> My difficulty is understanding in what coordinate system everything but
> images are expressed in.  (I’ve read the Coordinate System section in the
> new version of the VTK User’s guide.)  For example, if I set the position of
> a vtkSphereSource with SetCenter is that in pixel coordinates in the
> coordinate system, or is it an absolute location in space?  The same goes
> for a vtkPlane:  What coordinate system should locations passed to SetOrigin
> be in?
>
>
>
> My thought was that everything was expressed in the World coordinate system
> and the world coordinate system was established by the images, but that
> doesn’t seem to be working for me.
>
>
>
> Thanks
>
>
>
>                                 -- Scott
>
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