Return Reference to Location

[Mark.Ackerley]

Hi All,

Thanks in advance for your help.

I am  using Python (in Dynamo but this seemed more of an API question, apologies if it is out of place).

I'm trying to place families along pipes from a linked file. 

The pipes can be horizontal or vertical. 

I want to place the family centered on the the pipe location line.

I am looking to use this new family by instance method  https://www.revitapidocs.com/2018/4545a04f-b5e8-1921-5a4c-d734bc4874ca.htm

I know that I can set my Revit view to Coarse and Tag the Geometry (which appears to be the location line, I don't seem able to return this model line from the element geometry, only a solid).

However, when I try to return References to the linked Element, I appear only to be able to return them from the Element Solid Faces / Edges.  If I create family from these, it fails because the placemenet / location line is not on the Reference (surface). 

I can possibly establish the Face / Edge which aligns with the placement / location line, place my family and shift it back, but it seems incongruous.

I would be very grateful if anyone had a suggestion for how to return the Reference to the Location Line (which I am able to use for Tagging).

This link seemingly manages to tag an element without needing to return solids, but it seems to fail in Python, and the API doesn't have a create reference method, so I am obviously not understanding something! https://thebuildingcoder.typepad.com/blog/2019/05/tagging-a-linked-element.html

All assistance greatfullly received.

Mark

[zrodgersTSSSU]

Is there a reason it has to be a reference. Could you just get the pipes location curve then use that as the placement point for the tag? Something like:

foreach (ElementId elemId in selectedIds)
                {
                    Element elem = uidoc.Document.GetElement(elemId);

                    Curve eleCurve = (elem.Location as LocationCurve).Curve;

                    //evaluate curve

                } 

Then get the midpoint or evaluate at a certain distance. 

[Mark.Ackerley]

Hi,

Thanks for your response.

I actually found that I had to use a face reference to place a line-based family, so I didn't pursue this any further.

Kind regards,

Mark