i just want to let you see the reason for this thread:
keep in mind: for changing a wall's texture of a given room, i have to split walls on room limits.
so, moving a wall forces me to split the aligning wall (again, and again)... so far for the calculating method, hans [:D]
screenshot below:
it's the upper level of a house with 10+ sloping walls, almost NEVER splitted in the middle. as you can see, the roof is missing [;)]
macfrog