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I am editing a wall. in the roof and floor line edit, I added a gable, now I need to change the slope to match 12/12 pitch. How do I do this?
I assume there's already a roof in the desired position? If not it's easier to add the roof in before extending the wall (you could draw a polyline and ROTATE3D to mimic the profile of the roof if you need to do the wall firsty, though).
Select the wall and right click.
Click Roof/floor line
Select "Modify Roof line" then
"autoproject"
Select the roof.
If you've gone the polyline roof ou need to "project to polyline" rather than autoproject.
dJE