I know there are other topics - one of which I posted - however I need specific help. My apologies.

I'm on 2017 and using a VB.NET AddIn.

I have a point data extractor that re-curses the Feature Tree **of a Part** and returns X, Y, Z data for several DATUMPOINT's ("Point" Features). No sketch involved, thus no transform from Sketch to Model. All is well.

A user now wants this data relative to a user defined Coordinate System. No problem - I've added a ComboBox populated with any Coordinate Systems found in the model.

What I don't get - and I'm sure it's a fundamental block - is specifically how to do the Transform to a User Defined Coordinate System, which is selected in the ComboBox by name, let's say "Mikes Coordinate System";

So, I have an oPoint as a MathPoint populated with default coordinates.

**How do I transform this Math Point's coordinate array from the default coordinate system to the user defined coordinate system "Mikes Coordinate System"?** An example would be great - I'm stumbling on specifics, like how to get the 'transform' for the user selected coordinate system in the ComboBox.

So close yet so far... Any help much appreciated!

So... You have the coordinate system feature, right? So get it's feature data. The transform is a member of the feature data.