March 01, 2012, 12:14:22 pm
As I expected, it wasn't a Lumion problem. The original building model came to me from 3DS. I think there were some faces with different textures either side. eg. glass in front, concrete behind. Anyway, problem solved.
Also, is there a reason why trees sometimes shake wildly while making an animation? This seems to happen often even when wind speed is low?