I have followed your suggestion but I get the error in the “List.GroupByKey” node stating “Warning: List.GroupByKey operation failed. One or more input types are not matching. Lists as keys are not supported.”
Any suggestion? I am running revit 2017 and Dynamo 1.3.0875
I have recently developped this script so you can take a look. it works really good in my projects and it has no python.
I have used Dynamo 1.2 version and Archi-Lab, Clockwork and LunchBox package.