[vtkusers] vtkImagePlaneWidget offset from cut plane

[Bjorn Oksnevad]

Thank you for the reply Shash.

I am using the ActiViz which apparently does not support GetPlaneProperty(),
because that threw a memory access exception.
I looked at GetPolyData() and that lead me to look at
GetPolyDataAlgrotithm() and GetPolyDataSource().  I'm guessing
that vtkImagePlaneWidget.GetOrigin() is using the underlying poly data, so
the offset would occur with the poly data as well.

I did create a "fix" by setting my cut origin as the widget origin + (0.5 *
widget normal).  That appears to align my cut outlines perfectly with the
image plane widget.  I did remove the tubes and the outlines appear as flat
lines on the front and back of the vtkImagePlaneWidget.

Thanks,
Bjorn

On Sat, Mar 12, 2011 at 1:53 AM, Shashwath T.R. <trshash at gmail.com> wrote:

> Hi Bjorn,
> As I recall, vtkImagePlaneWidget already has a polydata describing the
> boundary of the plane. You could get that and manipulate it instead of
> mucking about with a cutter / tube filter...
>
> You can either directly manipulate the plane property (
> http://www.vtk.org/doc/nightly/html/classvtkImagePlaneWidget.html#aa967a678dc64d006ef7d9c9bce703e77)
> or get the polydata (
> http://www.vtk.org/doc/nightly/html/classvtkImagePlaneWidget.html#a118b91779af7e29ab0162b6109531b95)
> and send it to the tube filter if you really can't do without the tubes.
>
> HTH
> Shash
>
> On Fri, Mar 11, 2011 at 12:53 AM, Bjorn Oksnevad <boksnevad at gmail.com>wrote:
>
>> Hello,
>> I am using a vtkImagePlaneWidget to define a cutting plane for a
>> vtkCutter.  The vtkCutter is then used to create tube outlines where the cut
>> plane intersects some 3d mesh structures.  However, when I render the
>> resulting outline, the outline tubes are slightly offset from the
>> vtkImagePlaneWidget in the direction of the normal.  I was expecting the
>> outlines to be positioned exactly on the vtkImagePlaneWidget plane, since I
>> used GetOrigin() and GetNormal() from the plane widget to define the cutting
>> plane.
>>
>> Has anyone experienced this and have a solution/explanation?
>>
>> Thanks in advance!
>> Bjorn
>>
>>
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