I would like to make a GM family, that updates its color depending on if a requirement is met.
The requirement is a boolean parameter called "area_suffices". It is driven by formula.
I made 2 materials in the family: Red & Blue.
I also made a material instance parameter "fam_color". I would like this parameter to be formula driven:
if area suffices: shown_color = Blue, else shown_color = Red.
If I try to do this I get a revit error: This parameter type cannot be defined by formula's.
So in generic terms, I would like the GM family to have a red color depending on a parameter value and else a different color.
Given what I would like to achieve, is this possible in Revit? Or is it out of the question? Or are there other ways to achieve this?
You can nest two or more families wirh different materials in one host family, and create a <family type> parameter to choose one from a drop down list.
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