As part of his workflow, he first of all used the STL Exporter add-in to export the fishtank context from Revit. This ensures that sculpting work is done in a way that can be accurately scaled and proportioned.
After importing the STL context into Meshmixer:
- Bring a plane object (Import Plane) into Meshmixer and transform it to suit the tank wall that is to be sculpted.
- Do the freeform modelling in Meshmixer.
- Export to 3ds Max (see previous post). Holes may need to be capped.
- Go from 3ds Max to a SAT file into a Revit family.
Here is my previous post on Meshmixer:
What Revit Wants: Freeform and organic modelling from MeshMixer to 3ds Max to Revit