[vtkusers] vtkLandmarkTransform help

[David Gobbi]

Hi Andinet, Theodore,

Thanks for the correction, Andinet.  My mind must have been
off somewhere else when I answered, similarity is indeed 7DOF.

Theodore, the vtkLandmarkTransform class is passing its
nightly regression tests.  Can you provide more information
about the error, and perhaps include a short code segment
that illustrates the error?

 - David



--- Andinet Enquobahrie <andinet.enqu at kitware.com> wrote:

> David Gobbi wrote:
> 
> > 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
> >
> vtkLandmakTransform::SetModeToSimilairy() should be  7DOF.  3 
> translations, 3 rotations and 1 isotropic scaling.
> 
> -Andinet
> 
> >
> > 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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> 
>