[Insight-users] FW: How to convert VersorRigid3DTransform to vtkTransform

[Toon Huysmans]

Hi,
 
            I have registered two images and I have the result in a
VersorRigid3DTransform, now I would like to transform some vtkPolyData
using this transform.  I believe that VersorRigid3DTransform contains a
rotation (the versor) and a translation, so I set up a 4x4 matrix,
containing the rotation and translation as follows:
            |           R11      R12      R13      Tx        |
            |           R21      R22      R23      Ty        |
            |           R31      R32      R33      Tz        |
            |           0          0          0          1          |
 
I get the rotation matrix R using VersorRigid3DTransform::
<file:///C:\Documents%20and%20Settings\Toon%20Huysmans\My%20Documents\Im
age-Mesh%20Processing\ITK\DoxygenInsightToolkit-2.0.0\a03144.html#a2>
GetRotationMatrix, and the translation part using
VersorRigid3DTransform::
<file:///C:\Documents%20and%20Settings\Toon%20Huysmans\My%20Documents\Im
age-Mesh%20Processing\ITK\DoxygenInsightToolkit-2.0.0\a03144.html#a1>
GetOffset.  Then I use vtkTransform::SetMatrix to set the transform for
the polydata, and I use
vtkTransformPolyDataFilter to transform the polydata.  But the result is
not as expected, i.e. the transformation is not correct.
 
Does anyone have any clues on how to do it the right way?
 
Many thanks,
 
Toon Huysmans.
 
 
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