[vtkusers] Closest point set-to-point set distance?

[David Doria]

I would like to compute the smallest distance between pairs of points in two
sets. That is, I have a set of points A, and another set of points B. I am
currently storing the points of A in a vtkKdTree, and computing the distance
from every point in B to the tree. Is there any way to do something like put
the points of A in TreeA, and the points of B in TreeB, and find the closest
"tree to tree" distance?

Thanks,

David
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