[scripting] Accuracy of PointLocator Data?

[Julian Johnson <julian(at)exch.demon.co.uk>]

I'm using pointlocator data in a simple geometry script to hook together 
two vertices i.e. I want to find the nearest vertex to a given position. 
For an example of what I'm trying to do see  here:

http://www.exch.demon.co.uk/files/pointlocator.gif

I've set up the closestlocation query to return vertices/knots etc. 
(Here's a snippet from the code)

oGeo.SetupClosestLocationQueries(0,oPTrans)
PointLocators = oGeo.GetClosestLocations(((nuVec.X,),(nuVec.Y,),(nuVec.Z,)))
vertid = oGeo.GetTriangleVertexIndexArray(PointLocators)

vertid returns an array of three identical vertex indices (as it should).

Some of the time the nearest vert is identified correctly and everything 
works fine. However, quite often the query returns an adjacent vert.

Is there something about the pointlocator algorithm that I'm missing 
that would explain why it doesn't always pick up the correct vert? i.e. 
is it looking primarily for surfaces whose normal is pointing towards 
the vertex?

Each time I run the query the Geometry object is re-called so the 
acceleration cache should be fine...

Julian
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