sorry ...
maybe we meant two different things
There could be two problems

1) in a triangle a vertex can become the same as another because
a value as 100,123407 becames 100,1234 which is already at another vertex
So the triangle is corrupts

2) two different triangles, because 100,123407 <> 100,1234 can become the same
triangle cutting off excess decimals

but if I always formatted the string output for pov ray,
I think comparing strings using various instrings is the least expensive method,
because it does not have other complex mathematical operations...
in any case I always have a redundant triangle in the mesh.. and I have to
eliminate it..

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