Get blends from model to retrieve window opening

[lothar.kolbeck]

Dear community,

i am facing problems to retrieve the blend object of the window in the simple model attached.

I tried already with the filteredElementCollector in many ways (https://forums.autodesk.com/t5/revit-api-forum/how-to-extract-a-list-of-all-solids-from-a-family/m-p...) and looked for Blends in the elementIds of the wall and the window deleted with the temporary transaction trick.

The task i am trying to achieve with it is a quantity takeoff for a operational energy demand calculation. Thereby, i also extract the geometry of the windows and doors to visualize the thermal model to a user. So far, i put a bounding box around every window or door placed with a blend. Unfortunately, some windows (like the one in the model) have linked some element that makes the bounding box much wider than the clear width. So i would prefer to access the blend geometry. As i have all the windows and doors in my internal data structure, a reference from the window to the blend it is using would be the ideal solution. In Revit Lookup, i didnt find any link between the objects so far...

Thanks a lot,

Kind Regards

Lothar

[jeremytammik · Accepted solution]

The blend is part of the family definition. That lives in the RFA file, which can be optionally opened as a separate document. Your current document is (probably, not necessarily) the RVT project file hosting the family instance. To retrieve the bled element using a filtered element collector, you will have to open the family definition in a separate document:

https://thebuildingcoder.typepad.com/blog/about-the-author.html#5.25.3

[lothar.kolbeck]

Hello Jeremy,

thank you very much! As i want to keep my application robust for users i think it is better not to load the families, as shipped somewhere i probably won't have access to the family files.

So i will do the bounding box approach and crop the bounding box to meet the clearance width..

Kind Regards

Lothar