I suppose it has to do something with this: As you can see on the picture, the cells are probably not properly connected, because there're some white and blue edges at the cell borders. I suppose they should be yellow. Also notice small yellow edges at the side of all gravestones. Did someone had this problem? BTW, the cells are, of course, not finalized. I'm planning to use "Finalize WorldSpace" command when I finish all cells, which won't be probably this year though... :laugh: I think you might have a triangle that isn't properly connected. Sometimes I get one that is connected by two points but their edges aren't merged together