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Is there a parametric modeler plugin for Revit that's similar to Grasshopper for Rhino? I've seen videos showing how people have used Grasshopper to create automatic parking lot generators & space planning tools, and I'm wondering if Autodesk or a 3rd party developer have come up with anything similar, or have something in developement.
yes, its called Dynamo, and its an open source project that you can download, use, and contribute to.
http://wikihelp.autodesk.com/Vasari/enu/Community/Work_in_Progress/Dynamo_for_Vasari