I am attempting to use a script to get rid of all of the previously set materials in a project and replace them to be set to When I do this I get an error message in my final step that says “Warning: Parameter.SetValue operation failed.
The call is ambiguous between the following methods or properties: ‘Revit.Elements.InternalUtilities.ElementUtils.SetParameterValue(Autodesk.Revit.DB.Parameter, Revit.Elements.Element)’ and ‘Revit.Elements.InternalUtilities.ElementUtils.SetParameterValue(Autodesk.Revit.DB.Parameter, string)’” If anyone has any advice on how to fix this please let me know!
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I have a similar question. How to set a material parameter “By Category”?
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I’m also trying to use Dynamo to set material parameters to .
It seems that trying to set a material to By Category doesn’t work because By Category is not technically a material; It’s the wrong data type. Even using Element.Get on another material that’s already set to By Category returns a string…
Would be cool if Dynamo or the API had a way to set a parameter to By Category even though it doesn’t fit the data type…
I am not sure, but try setting the value to -1 and not null. The Revit API doesn’t do nulls, it does ElementId.InvalidId or -1 when there is no value for that parameter type.
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You can set a material to By Category to use this node (in clockwork)
