Transforming Family Dynamics Through Dynamo Change

As of Dynamo version 1.3.3, there are no built-in nodes available to change the family type directly. To address this, a Python node was created specifically to change the family type of elements.

The approach is straightforward: it uses the Revit API’s Element.ChangeTypeId() method to update the element’s type. Additionally, a custom function was implemented to ensure that the output data structure matches the input structure, maintaining consistency.

Here is the core Python code:

object = UnwrapElement(IN[0])
type = UnwrapElement(IN[1])

def ChangeType(obj):
    TransactionManager.Instance.EnsureInTransaction(doc)
    if isinstance(obj, Element):
        obj.ChangeTypeId(type.Id)
        r = obj
    else:
        r = []
        for e in obj:
            if isinstance(e, Element):
                e.ChangeTypeId(type.Id)
                r.append(e)
            else:
                r.append(ChangeType(e))
    TransactionManager.Instance.TransactionTaskDone()
    return r

OUT = ChangeType(object)

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