topic Re: references in the same place in Revit API Forum

references in the same place

Anonymous — Sun, 12 Nov 2017 12:50:22 GMT

Hi,

Is there a possibility to check if references (say familyreferences of different instances placed in a model) are parallel and in the same place/overlapping?

regards,

Raymond

Re: references in the same place

jeremytammik — Mon, 13 Nov 2017 09:01:32 GMT

Dear Raymond,

Thank you for your query.

Yes, of course.

Each family instance has an insertion point and a rotation.

The insertion point may be handled differently depending on the type of family definition and instance placement type, e.g., face or curve hosted, etc.

Please provide a more detailed example of your exact situation, and I am sure it can be easily solved.

You can also retrieve the family instance placement transformation from its geometry, by accessing the GeometryInstance Transform property:

http://www.revitapidocs.com/2018.1/99cb4580-9b59-6564-8181-6082f275a869.htm

That will probably provide a more generic possibility to compare the properties you are after.

I hope this helps.

Best regards,

Jeremy

Re: references in the same place

Anonymous — Mon, 13 Nov 2017 09:13:23 GMT

Hi Jeremy,

I would like to compare the references of facebased familyinstances. If
they are in line (say vertically) and 4 instances are placed I would like
to return 1 reference instead of 4.

Re: references in the same place

jeremytammik — Mon, 13 Nov 2017 10:25:03 GMT

Dear Raymond,

Thank you for your update.

Yes, well, what I already said above still applies.

You can use the insertion point and direction for some basic comparison.

If you need more than that, you can analyse and compare the respective GeometryInstance Transform property values.

Best regards,

Jeremy

Re: references in the same place

Anonymous — Mon, 13 Nov 2017 10:31:23 GMT

Correct me if I am wrong, but a reference does not have a direct accessible
direction. Is there a way to retreive the direction of the reference (other
than using FAIR59 example in another post)?

Re: references in the same place

jeremytammik — Mon, 13 Nov 2017 15:03:47 GMT

Dear Raymond,

  doc.GetElement( Reference.ElementId ).GetGeometry( new Options )

returns the family instance element geometry.

It contains a GeometryInstance, which has a Transform, which determines a coordinate system including a direction.

Cheers,

Jeremy