I try to set the material of a Revit Category to Null / Empty. Used the “Set SubCategory Properties” from GeniusLoci, what works well for assigning materials. But how to “deassign”? Inside Revit I can use the Button in the lower left. But how to do this with Dynamo??? THX [grafik]

Hello, set Material to null (None) works perfectly (no need parameter) [image] import clr import sys import System clr.AddReference('ProtoGeometry') from Autodesk.DesignScript.Geometry import * import Autodesk.DesignScript.Geometry as DS #import Revit API clr.AddReference('RevitAPI') import Aut…

Yes, I did. But that doesn’t work. Seems to a problem with the type. [grafik]

Have you tried feeding it a null?

Hello @norbert_graeser …how about this ? [test]

PS…the way i have done it in the image above, has this issue it delete the material from the library… I havent find out yet, how to just empty the subcategori material, set to no material

Maybe this has some clue [image] Set phase demolished to None Revit Is it possible set the demolished phase of elements to “None” by Dynamo? [image] Our background: We use a different program for out cost estimations which needs an IFC-file to work with. Because of the l…

Ah! It’s an element ID. The old -1 trick if I am not mistaken. Not sure how to produce that without Dynamo so editing the Python Konrad posted in that topic is the likely best path forward.

You can also use Mat = ElementId.InvalidElemtId https://www.revitapidocs.com/2015/08ae8886-6ab3-3ef5-d2e0-0da2ffa7bd2c.htm

Thank you for your help! "cat.Material = None" is what do the job in a perfect way.

Set Material of Category to Null

norbert_graeser June 4, 2021, 11:57pm 5

Yes - but didn’t work.

Assign Material to all Object Styles

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Set Material of Category to Null

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