The problem with complex roofs is that I am only scratching the surface right now. There are quite a few permutations that are possible that are quite common with many residential designs that I still cannot handle with the current complex roof module.
Consider this relatively simple example:
With this case the fascia is at two levels. At the back corner on roof plane A you have what I call a 3/4 Hip (kind of hybrid between a half hip and a hip, one side is a hip and the other is technically a half hip). This causes the fascia line to rise by 24".
Where roof plane E meets roof plane D, you have one roof plane dying into the other and creating a “Flying Valley” and the other roof plane terminates at the wall below (a partial gable end?).
I guess I was wrong there are “flying valleys” after all.
The problem with trying to construct this particular example with my proposed secondary roof module is that its a little more complicated than that. Rather than two separate roof assemblies the roofs are technically merged. Also the 3/4 Hip configuration kind of requires that the roof assemblies are one construct.
This example really has me scratching my head right now.
What does jump out at me is that when you are dealing with an inside corner (angle between walls is greater than 180 deg.) the roof planes die into each other creating a partial gable and a flying or hanging valley.
When you have an outside corner (angle between the walls is less than 180 deg.) you then end up with a 3/4 hip. Two additional solutions might be a gable or half hip with unequal legs. If you were to keep making the setback of the half hip larger eventually it would degenerate into the 3/4 hip where one leg is now a hip roof.