More information:
Rhinoceros – Grasshopper – ARCHICAD tutorial videos
This video clip shows how to create a parametric tower by using Rhinoceros, Grasshopper and ARCHICAD. The new connection between the applications offers bi-directional geometry transfer. The basic geometrical shapes created in Rhinoceros now can be translated into full-fledged BIM elements in ARCHICAD while adding algorithmic editing functionality thanks to Grasshopper.
Free ARCHICAD Download: http://www.graphisoft.com/downloads/
Source