[vtkusers] Get homogeneous matrix of a vtkImageSlice

[Leeloo]

Hi !

I am trying to get a 4x4 transform Matrix in order to use it on contours
made on a vtkImageSlice.
I used two orientation vectors, calculate a third on with a cross operation,
then made a matrix with them .

v1x,v2x,vx,0
v1y,v2y,vy,0
v1z,v2z,vz,0
0,0,0,1

Did I thought well or ?



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