[vtkusers] How to create resliceAxes from two points in a curve?

[richard anderson]

I would like to use vtkImageReslice to get the cross section of a curve at a
point P0. 

To compute the reslixeAxes, I would like to use P0 and its neighboring point
P1 to decisde the direction. 

As you know, resliceAxes is a vtkMatrix4x4. I think it should be somehting
as:

A, B, C, P0.x
D, E, F,  P0.y
G, H, I,  P0.z
0,  0, 0,   1

Can anyone let me know how to compute the value of {A, B, ... I}  based on
P0 and P1? 

Thank you!




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