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1) Create rectangular part of the walls separately
2) Create angled walls for the bay separately
3) Create roof over each piece
4) move the bay with its roof as close as possible
5) Use Modify>>Join Roof
You will be prompted to select the edge of the roof to join - select the edge of the bay roof
You will be prompted to select a face of the roof to join to - you will select the face of the main roof.
Final result -
1) Create rectangular part of the walls separately
2) Create angled walls for the bay separately
3) Create roof over each piece
4) move the bay with its roof as close as possible
5) Use Modify>>Join Roof
You will be prompted to select the edge of the roof to join - select the edge of the bay roof
You will be prompted to select a face of the roof to join to - you will select the face of the main roof.
Final result -
Accepted solution
I can offer up one approach that is similar but using shaped editing for the bay roof instead. The main roof is sketched around the perimeter and the path excludes the portion where the bay roof will go. Then the bay roof is sketched. It takes a little effort to sort out where the ridge at the bay should go. You'll see some reference planes I used to plot out where the ridge intersections ought to be based on the slope of the larger roof. Once I worked that out I used Shape Editing to raise the points for the bay roof ridge/valleys up to the correct height.
The actual perimeter walls of your design will affect the outcome, so what I've done is an approximation based on what I see in your picture. I also did not use Pick Walls to sketch any roof lines because doing so affects how the roof references the host level. I wanted both roof elements reference the level the same way.
Steve Stafford
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I can offer up one approach that is similar but using shaped editing for the bay roof instead. The main roof is sketched around the perimeter and the path excludes the portion where the bay roof will go. Then the bay roof is sketched. It takes a little effort to sort out where the ridge at the bay should go. You'll see some reference planes I used to plot out where the ridge intersections ought to be based on the slope of the larger roof. Once I worked that out I used Shape Editing to raise the points for the bay roof ridge/valleys up to the correct height.
The actual perimeter walls of your design will affect the outcome, so what I've done is an approximation based on what I see in your picture. I also did not use Pick Walls to sketch any roof lines because doing so affects how the roof references the host level. I wanted both roof elements reference the level the same way.
Steve Stafford
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Accepted solution
If you accept a slight distance between the main part of the roof ( something around 3- 5 mm) and the bay corner, then it will be easy using on Roof by Footprint or two roofs Joined using Roof Join tool , as Rina suggested.
If you want no distance, then:
A possible approach can be using two roofs joined ( not roof joined) together and then , use two voids to cut the excess material from the underside...as in my screencast attached...
Constantin Stroescu
If you accept a slight distance between the main part of the roof ( something around 3- 5 mm) and the bay corner, then it will be easy using on Roof by Footprint or two roofs Joined using Roof Join tool , as Rina suggested.
If you want no distance, then:
A possible approach can be using two roofs joined ( not roof joined) together and then , use two voids to cut the excess material from the underside...as in my screencast attached...
Constantin Stroescu
The bay in the image provided does not have three equal sides. The resulting roof ends up a bit misshapen. That's why I went with the shape editing approach.
Steve Stafford
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The bay in the image provided does not have three equal sides. The resulting roof ends up a bit misshapen. That's why I went with the shape editing approach.
Steve Stafford
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@tpreisler: Bigger challenge than I thought. @SteveKStafford is absolutely right; your roof is impossible to build using the Roof Tool Believe me, I tried every trick I knew. You need to shape it into submission from a floor using Modify Sub Elements Tools. I love to post a Screencast for you, but I'm either an idiot, or the darn thing is broke. Probably the former. Well, we can't all be as good as @constantin.stroescu. Anyways, here's the RFA showing the completed "Bay" Roof using a Floor. Note that there is another bay roof hidden in the project. That one was just used to cut an opening using the Dormer Tool.
Cheers
...You could also build it from a mass. Just a few mores steps than doing it this way. But, there's pros and cons with both.
@tpreisler: Bigger challenge than I thought. @SteveKStafford is absolutely right; your roof is impossible to build using the Roof Tool Believe me, I tried every trick I knew. You need to shape it into submission from a floor using Modify Sub Elements Tools. I love to post a Screencast for you, but I'm either an idiot, or the darn thing is broke. Probably the former. Well, we can't all be as good as @constantin.stroescu. Anyways, here's the RFA showing the completed "Bay" Roof using a Floor. Note that there is another bay roof hidden in the project. That one was just used to cut an opening using the Dormer Tool.
Cheers
...You could also build it from a mass. Just a few mores steps than doing it this way. But, there's pros and cons with both.
I made mine with a roof.
Steve Stafford
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I made mine with a roof.
Steve Stafford
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Ouch...completely forgot that you could shape edit a Roof. Well, "Live and Relearn"; that's what I always say. 
Thanks for the spanking @SteveKStafford.
Ouch...completely forgot that you could shape edit a Roof. Well, "Live and Relearn"; that's what I always say.
Thanks for the spanking @SteveKStafford.
Well...., in a more general case, when the sides of the bay are unequal and the angles between the two neighbor sides and the edge ( from there common point to the peak) are unequal ..meaning unequal slopes too ...something like this:
then, a simple geometric construction will do the work -
( at the beggining ,I thought , it could be done using a combination of Slopes with Slope Arrow tool, but it didn't work..)
Constantin Stroescu
Well...., in a more general case, when the sides of the bay are unequal and the angles between the two neighbor sides and the edge ( from there common point to the peak) are unequal ..meaning unequal slopes too ...something like this:
then, a simple geometric construction will do the work -
( at the beggining ,I thought , it could be done using a combination of Slopes with Slope Arrow tool, but it didn't work..)
Constantin Stroescu
Yep, works like a charm. Abracadabra, no shape editing:
Yep, works like a charm. Abracadabra, no shape editing:
Accepted solution
Okay, feeling guilty I didn't provide a screencast for the approach I chose.
Steve Stafford
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Okay, feeling guilty I didn't provide a screencast for the approach I chose.
Steve Stafford
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@tpreisler: If you ever want to do a shag carpeted roof (avocado green, of course); use my approach. As you can see from my Revit file, it’s essentially identical to what @SteveKStafford showed you, except using a Floor.
@tpreisler: If you ever want to do a shag carpeted roof (avocado green, of course); use my approach. As you can see from my Revit file, it’s essentially identical to what @SteveKStafford showed you, except using a Floor.
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