Complex Roof being a jerk

[JaredBanks]

I've having an issue with the complex roof in ArchiCAD 15. When I try to make the last hip a gable (See image attached), ArchiCAD politely deletes one of the roof planes. Anyone have any thoughts?

[JaredBanks]

And when I make the last hip a gable. What the huh? For now I can make a work around that cuts this into 2 complex roofs. But it'd be cooler to just have 1 object. Which I thought was the whole point.

[JaredBanks]

At first when I was playing with the complex roof, I was very impressed. It was easy to use, intuitive, and very slick. Now the more I delve into it to solve this roof, the more annoyed I get. I can get the roof to work, if I put a whole in the vanishing roof plane (before it vanishes of course). I have no idea how to get the missing plane back. I've rebuilt the roof multiple times, tried from different points. I can make a very crazy roof that works. But not this one. Okay I'm ready to be proven wrong here.

[Barry Kelly]

I don't have a solution for your problem apart from converting to single roof planes and editing as in version 14 and before.

But I can see why it is happening.
An extra node is created on the hip in an extention to the ridge off to the side.
This node can not be moved or altered in any way.

As soon as you try to move the node for the hip end past this extra node your problem will appear.
Choosing the gable option for the end is the same as manually dragging the node to form the gable.

I noticed too that other eave overhang distances are affected as well as the roof plane disappearing.

Barry.

[Anonymous]

seems to be working ok (at least if i'm understanding it properly);

could it be a problem with the geometry of the pitching lines that's causing the ridges/valleys to not meet exactly and causing that plane to become corrupted?

[Barry Kelly]

Kombibob,
Does your roof have the extra node on the ridge?
I'd be guessing not - therefore no problem.
It probably is the geometry of the pitching lines (eaves overhang) that cause this extra node to appear or not.

Just playing quickly before if I had a rectangular roof and then manually added nodes and stretched a bit out the side all was fine - no extra node.
As soon as I did the same on the opposite side the extra node appeared.
So obviously the geometry of what you model will affect this extra node.
I haven't played with it enough to work out what causes it of if there is a way to model without getting it.

Barry.

[Stephen Dolbee]

After watching the demo's of complex roofs in AC15 I was really excited. After using it for a couple of weeks I have gone back to the old way (one roof plane at a time). This is disappointing.

[JaredBanks]

kombibob,

How did you do that? Like Barry mentioned, I noticed that extra node (and it's evilness) and was maddened that I couldn't get ride of it or do anything about it. What did you do to not get that node? I tried using the magic wand to create the roof from an outline and also build it up bit by bit. No luck.

Additionally I found further issues with the complex roof. See the attached image. I couldn't figure out a way to make the gable extensions. I guess for now I'll stick with separate roof planes. Just annoying, not the end of the world...

[David Maudlin]

Jared:

I think there is an issue with how ArchiCAD tries to alter the roof when the problematic hip roof is changed to gable. In my illustration below, you can see ArchiCAD trying to connect two of the roof planes as the hip roof is modified. I am getting the same result as you when changing the hip to gable. This is a clear bug and should be reported to Graphisoft. If it was me, I would try dividing the entire roof into two or more elements (rather than going back to single plane roofs) and combining them with the Connect command, so the single element geometry is less complex, I think this will also help with the gable extensions (covered in my next post).

David

[David Maudlin]

JaredBanks wrote:
Additionally I found further issues with the complex roof. See the attached image. I couldn't figure out a way to make the gable extensions. I guess for now I'll stick with separate roof planes. Just annoying, not the end of the world...

I was able to add the gable extensions to a simpler roof element by editing the roof perimeter (not the pivot line). When I did this to your original roof, again the geometry of other parts of the roof got messed up, so another reason to go with combining (Connect) multiple roof elements.

David