Trim an Intermediate (dormer) roof to an existing roof

[Anonymous]

How do I trim an intermediate roof (small dormer) that intersects with an existing roof?

[Dave Jochum]

drew wrote:
How do I trim an intermediate roof (small dormer) that intersects with an existing roof?

SEOs (Solid Element Operations). Described in detail in the User Guide, Vol. 2, starting on page 50.

[Link]

Drew

You can also try selecting the existing roof, then while in the roof tool ctrl click on the edge of the dormer roof that you want to trim back. This will also extend the roof, if they aren't actually intersecting. Just be sure to ctrl click the edge that is not perpendicular to the cutting roof, but the edge that is closer to being parallel to it.

Cheers,
Link.

[Anonymous]

That worked great....
The only problem is that I have whats left of the existing larger roof showing underneath the dormer roof.

How do I trim whats showing underneath?

[Djordje]

drew wrote:
That worked great....
The only problem is that I have whats left of the existing larger roof showing underneath the dormer roof.

How do I trim whats showing underneath?

Well, if you posted a screen shot, it would be much easier to answer

Also, an extensive lesson on dormers (written for ArchiCAD 5 or 6, but still valid, with the exception of SEOs) is avaliable on ArchiGuide Archives:

http://www.graphisoft.com/archiguide_archive/ArchiGuide_Online_6o/issue15/dormerexp.html

[Link]

Easy Drew!

Select the existing roof, then while in the roof tool, click on an edge of that existing roof. A pet palette will appear - select the 5th button along from the left - it has a minus sign in it. This will minus a portion of your roof out. To specifiy the area you want to minus out, trace one of the dormers, by space bar clicking it. Repeat for the other dormer - Whooshka!

The whole procedure can be done in 20 seconds - including the previous step!

Cheers,
Link.