Roof integrity-- ability to change pitch

[Anonymous]

Once roofs have been created, it would be nice to be able to change the pitch without losing the integrity of the roof intersections.

[Anonymous]

Do you mean to link associated roof pitches so that they adjust up and down together? This could be nice, but it it might be a bit complicated to make it behave with dissimilar pitches. I've seen plenty of situations where roofs require detailed manual adjustment, and automatic relationships like those in Revit can get in the way of this.

[Anonymous]

Yes. For example if you designed a house with a 6/12 pitch and found out it violates the height limit, you could select all the roofs and change them to 5/12 without having to repair all the intersections so it shows up correctly in the model.

Even better still if you could perform other operations. Let's say a hip intersection between two roofs were linked, you could raise the one of the roofs or change its pitch and the hip would repair itself and display properly on the floor plan.

Command clicking to form the intersection should automatically link the roofs.

[Stress Co_]

And when we get that.. can we also have THIS.
I know a few work-a-rounds, but what a hassle when the pitch changes.

[Barry Kelly]

phubbell wrote:
Yes. For example if you designed a house with a 6/12 pitch and found out it violates the height limit, you could select all the roofs and change them to 5/12 without having to repair all the intersections so it shows up correctly in the model.

This happens now doesn't it?
In the attached image I just selected the roof and changed the pitch - no further editing needed.
Or am I missing what you mean.

Once two roof planes are trimmed together then so long as you change both pitches the same the will remain trimmed.
Of course all the roof planes need to be the same pitch in the first place.
Doesn't work if they are all differnet pitches.

Barry.

[Stress Co_]

Barry wrote:
Or am I missing what you mean.

Gable end roofs, elevation views ......

[Anonymous]

Yup. That's what I mean.

Oddly enough if the roof was created with the hip roof geometry method, it repairs correctly. If you create it manually or modify the hip roof, you get the gaps. Both of the roofs below were 12/12 then changed to 6/12. The one on the left was made with the hip roof tool.

[Stephen Dolbee]

This was a wish of mine years ago. Apparently, not a priority.

[Laszlo Nagy]

I think the way it works is when you trim the two Roofs together (using the Mitre option) it will set the edge angle to a specific value that is calculated from their geometry. If the slope of the Roofs is changed then that value will not be correct anymore.
However, if you set the common edge to vertical (where it applies) then it will still be correct even if the slope is changed.
Probably not all common edges can be set to vertical, but several of the common edges on that image a few posts ago can be. Probably they are the ones at the horizontal ridges.

[Barry Kelly]

I use the hip roof (polyroof) tool a lot so didn't notice this problem.
I tend to use the vertical edge method as I discovered years ago if you don't and you trim a wall to the roof under the gable you quite often get a "leak" where the wall squeezes through the gap.
If I need the edge of a roof to not be vertical then it can be edited as necessary.

Barry.