It would be useful to have the ability to choose a 3D region of a model that would be read into CFD, rather than the current approach of reading through everything that is on-screen.
For instance, a large building in Revit with lots of detail, we may wish to run an analysis on a small 'L' shaped room buried in the centre. If we had functionality that allowed us to sketch a bounding box around that region and only read this into CFD it would be very useful.