I wonder if I can get anyhelp: All of a suddent my model has started acting straneg: walls have become ruined and transparents in places. There is a jpeg of the walls and what I mean. Anyone can tell mehow o fix this problem, please? It is a fairly complicated 3D model of a chursh in Venice Ihave been working on for the last few days. Only the walls are displayed. I wonder if I can fix it without rebuilding the walls.