Hello all,
Can anybody explain why I get null for this graph?
I am trying to get the dimension between opposite faces of a rectangular column.
I have made sure that I select the opposite faces as both are parallel to X-axis.
I tried many nodes that create dimensions but I still cannot make any.
Hi @Omar.Elwan ,
Add a “List.FirstItem” node after your Element.Geometry Node 
Please read the error message carefully
It seems that this node also needs revit elements and not element references
Can you try it with my family? I strongly think the problem is in the family itself!
M_Concrete-Rectangular-Column.rfa (360 KB)
Edit your family and name your reference planes.
It will be easier to find the right references.
I have found the problem. I want to collect all the references in the family to be filtered afterward. I collect them with the node (Element Surfaces References) but It seems that it does not collect them properly. Do you know any node that calls all the references in a family instead of calling them with their names?