How to get all faces from Room where walls are in linked file in Revit API

[Pravin_Lande]

Hi 

We have room in active document and walls are present in linked file. when we try to get all faces of room we are getting only one face. but we want to get all faces of rooms to get walls, ceiling, floor from linked file.

kindly suggest is it possible via Revit API to get all faces of room programmatically.

Regards,

Pravin

[aignatovich]

Hi, take a look at the SpatialElementGeometryCalculator class. You can retrieve room geometry with boundary faces data.

So, firstly call SpatialElementGeometryCalculator.CalculateSpatialElementGeometry method. It returns an instance of SpatialElementGeometryResults class, then you can get a solid from the results, using SpatialElementGeometryResults.GetGeometry method, then for each face of the solid you can retrieve a list of SpatialElementBoundarySubface. It has SpatialBoundaryElement property (LinkElementId), so you can retrieve a boundary element both if it is located in the model or in the linked file.

[CristianHarper]

On the GetGeometry() Method is there a way to set references to 'true' so we can place a face-based family on the linked model room wall faces? 

[jeremytammik]

Dear Pravin,

Thank you for your query and many thanks to Alexander for his helpful solution!

Another way to address this task might possibly be to ask the room for its closed shell using the Room ClosedShell property and determine the faces from that:

https://www.revitapidocs.com/2020/1a510aef-63f6-4d32-c0ff-a8071f5e23b8.htm

I do not know whether the room in the linked file will provide this data, nor whether you may need to apply some transformation to it to get it into the current project coordinate system, but it enable a quick and simple solution.

The Building Coder offers several samples illustrating its use:

https://www.google.com/search?q=closedshell&as_sitesearch=thebuildingcoder.typepad.com

I hope this helps.

Best regards,

Jeremy

[jeremytammik]

@CristianHarper simply set ComputeReferences to true in the Options class passed in to the Geometry property:

https://www.revitapidocs.com/2020/d7da6de4-74a9-60e2-826f-698a5730d0a8.htm

[CristianHarper]

@jeremytammik,

The GetGeometry method doesn't accept options correct?

I know there is another get_geometry method that accepts options, but it doesn't work with linked elements.

If there is an example the GetGeometry method accepting options can you refer me to it? I have been searching for a couple months now.

[jeremytammik]

Struggling for months sounds like a good idea if it involves nothing whatsoever but digesting information gradually.

Working eight hours a day with no progress sounds like a bad idea.

Regardless, maybe you are barking up the wrong tree?

Many paths lead to Rome.

How about this recent discussion on using the ReferenceIntersector in a linked file?

https://thebuildingcoder.typepad.com/blog/2020/05/using-referenceintersector-with-a-linked-file.html

[CristianHarper]

@jeremytammik 

😁 It's a good thing this is a side gig just trying to help out my company's different departments.

Definitely looks like I was barking up the wrong tree. I'll give that ReferenceIntersector a try!

Thanks for your help