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Strange References in UDF

Strange References in UDF

Strange References in UDF

(OP)
I'm currently trying to put together a set of UDFs
I'm noticing some odd behaviour with cretain features in UDFs.

First problem

If I use a curve projection and project a curve onto a face the only reference required is the face to project onto (I've got the projection vector and the curve inside my UDF)
If I change the same UDF to project a point it now needs a new reference of "Projection section".
The curve and point are both in the same sketch and the sketch is in the feature set that the UDF brings in.
Why the different behaviour?

Second Problem

As a work around I've projected a very short line (0.05mm) onto my face.  The face is double curvature so the shorter the line the more accurate my approximation.
I then put a datum plane on the line at 50% and section the line with the datum plane.

When I add these features to the UDF (Specificly the Datum Plane) I then get asked to re-map a surface when using the UDF.  This comes up as a second form after specifying the values and references in the normal UDF form.
the face the UDF want's to map has no relation whatsoever to the Datum Plane and if I just don't map the surface the UDF completes fine.
Why does it ask for this re-mapping especially if it doesn't seem to need it to create the UDF?

Any insight into this would be much appreciated.

Mark Benson
Aerodynamic Model Designer

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