How to do offset of a STL model when the face normal are very similar to each other?

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LIN Hongbin
LIN Hongbin on 8 Mar 2016
When the face normal are very similar to each other,How to calucuate the offset of the vertex Pi? I have trid to alculate the barycenter of intersection of all three faces, however,due to the computational accuracy,I got NAN when I use inv command.

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