Finally

Finally got a set of walls out of Revit via IFC into my viewer. Was stuck on a problem for ages for the simple reason that I didn't realise in IFCAXIS2PLACEMENT3D(#67,#9,#7), the second attribute given is the Z axis, not the X, the first is the origin point and the second will be the Xaxis. After making that small adjustment everything fell into place. Still have to do something about polylines and curves, but for the most part am happy that I can say a mock-up of the system is complete and I can now start working on the unit which begins (eeeek) next week which I'll be lecturing in. The rest of this weekend can be dedicated to extracting images and notes from all the HVAC books that have been accumulating at my desk.