[vtkusers] Numeric instability of FindClosestPoint from vtkCellLocator?

[oyster]

The bounds of the surface model is about {-78,78, -78,78, 0, 60}, and the
sample vertices is about 2400. In such a configuration, gaps between
incident vertices is about 160/2400=0.0666, and I set the celllocator's
tolerence to 1e-30. 
However, a tol with 1e-6 and 1e-30 generates different point sets; And every
time I go through a different loop, points with different positions got,
every time. Though they all lie on the surface through a quick visual
examine.




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