Kyle -
You have two roofs already, right? If you didn't have this figured out already, to add the third one:
- option-click one of the existing roofs, and open the roof tool settings.
- reset the height (of the pivot line) at same height as the ridge where you want all three planes to meet. This should be precise. I would leave the roof pitch alone for now, but you can calculate what it should be, or guess and reset that too. You can tinker with the pitch later, if need be.
- select the polygon construction geometry. This is not critical; you can use the rectangle CG method and drag the corners to where you want them later.
- draw the pivot line from that common intersection point perpendicular to the direction you want the new roof to slope. It looks like this might be parallel to one of the diagonals across the walls below. Maybe you have a particular slope direction in mind. Hard to tell from here. This can be adjusted later, but it will affect how everything else
- click on the high side of the pivot line so that the roof shape you draw will slope down from the pivot line.
- draw a shape for the third roof. Again, you can be as accurate or sloppy as you like with this. You adjust the edge and corner locations later.
Check the intersection of the roof planes in the 3D window. Chances are that the second and third roof planes do not meet at a clean dihedral. so... - Select the third roof plane, and command-click the adjacent roof plane edge to adjust it to intersect the third roof plane. Then do the same thing again, but with the third roof plane selected first. You may need to do this in a plan view.
You should now have a clean ridge between planes 2 and 3. If this ridge is where you want it, and the bottom corner and edges of the third roof are where you want them, you are done. If not, tweak the plan location of the free end of the pivot line, and/or the corner locations and overhangs in plan, and/or change the roof pitch to your taste, then readjust the ridge dihedral between roofs 2 and 3 with the double command-click trick as above.
Last of all, adjust wall heights and trim them to the roof above.
I think should do it.
This is not necessarily the most efficient way to go about this. If you know how the plan geometry is developed, and exactly how you want the third roof to sit on it, you may be able to construct the third roof so that it does not need to be adjusted, stretched and fit.
This post covers some fairly rudimentary techniques, but the question seemed to warrant it. I don't often have time to get in here, but did tonight.
Rubia Torres
