[vtkusers] vtkTransformInterpolator

[Arwen M.]

Hey,
 
I'm trying to use the vtkTransformInterpolator in python, but when I try to add transforms without rotation the interpolator returns transforms with messed up rotations 
 
ex.
C:\Program Files\Windows Resource Kits\Tools>python
Python 2.4.4 (#71, Oct 18 2006, 08:34:43) [MSC v.1310 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from vtk import*
>>> t=vtkTransformInterpolator()
>>> transform=vtkTransform()
>>> transform.Translate(10,0,0)
>>> t.AddTransform(0, vtkTransform())
>>> t.AddTransform(10, transform)
>>> tOut = vtkTransform()
>>> t.InterpolateTransform(5, tOut)
>>> print tOut
vtkTransform (00A4FB18)
  Debug: Off
  Modified Time: 526
  Reference Count: 2
  Registered Events: (none)
  Inverse: (00000000)
  Matrix: (012611A0)
    Debug: Off
    Modified Time: 527
    Reference Count: 1
    Registered Events: (none)
    Elements:
        -1.#IND -1.#IND -1.#IND 0.5
        -1.#IND -1.#IND -1.#IND 0
        -1.#IND -1.#IND -1.#IND 0
        -1.#IND -1.#IND -1.#IND 1
  Input: (00000000)
  InverseFlag: 0
  NumberOfConcatenatedTransforms: 1
      0: vtkSimpleTransform at 0126FC18
  DoublePoint: ( 0, 0, 0, 0)
  Point: ( 0, 0, 0, 0)
 
In this example the translation is also off.  
 
As well, when I try to set a small rotation at the start to avoid this problem, there are still some combinations of rotations and translations that return matrices similar to the one in the example I posted.
Any ideas as to what's going on with the interpolator?
Thanks!
-Arwen


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