Hi, i made a building in Google Sketchup which i exported to 3ds max and then to gta sa format ( .dff, .col ).The problem is that the models has some invisible walls which doesn't exist in the sketchup project either in the .col file( Screenshots here ).I tryed to remake the house only using lines, to export a fresh, not-textured models as dff, to optimise the .col file but nothing seems to work.Please, i am desperate, give me some advices ( except suggestions to start modelling in another program )