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After diging a bit I've found that there is some uncertanty in the part of code responsible for target point coordinates calculation.

It does not take into a count the real geometry of a (?spheric?) face and thus can give a point opposite* to the point-of-interest (not belonging to surface of the solid).

It is declared that "The SurfaceEvaluator object can be obtained either from the Face object or from any of the surface geometry objects. It’s generally better to use the evaluator on the Face object since it takes into account additional information provided by the solid."

The tiny-little-thing remained unclear - how the code should be modified in order Face.Evaluator.GetPointAtParam return only Point belonging to the Face.  

 

* transient geometry surfaces are boundless 

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