[vtkusers] vtkLandmarkTransform help

[David Gobbi]

Hi Theodore,

Are you sure that you had the mode set correctly for
the number of degrees of freedom that you wanted?

  vtkLandmarkTransform::SetModeToRigidBody()   6DOF
  vtkLandmarkTransform::SetModeToSimilarity()     9DOF
  vtkLandmarkTransform::SetModeToAffine()         12DOF

Cheers,
 - David

Theodore Papatheodorou wrote:

> Hi,
> I am trying to do a landmark registration using the 
> vtkLandmarkTransform and it is not working correctly. I use dummy data 
> which I manually translate, then pass it through the filter and see if 
> the correct translation matrix is returned. Indeed it is! However, 
> whenever I try to do the same with a scaling it does not return the 
> correct scaling. It also has problems with affine transforms. 
> Basically whenever the filter has to deal with 9 or 15 degrees of 
> freedom it returns some very strange results.
> Has anyone noticed it before and/or know what causes it? Is it a bug?
> tp
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