topic Re: Create sloped butterfly roof in Modeling

Create sloped butterfly roof

Anonymous — Tue, 23 May 2023 12:06:34 GMT

Hi,

I'm trying to create a butterfly roof that is sloped. So essentially you have the butterfly form (it slopes down by 3 degree to the valley) and then the whole roof slopes by 7 degress from one end of the building to the other. How do I go about doing this? (I'm an Archicad beginner)

Thanks

Re: Create sloped butterfly roof

DGSketcher — Mon, 07 Sep 2020 10:16:09 GMT

Depending on the detail in the valley I would be inclined to use the SHELL tool. You can do this with single roof planes but it sound like it may be easier to set up with the Shell tool.

You may want to start by reading this and some of the other associated pages...
https://helpcenter.graphisoft.com/user-guide/76514/

Re: Create sloped butterfly roof

vistasp — Mon, 07 Sep 2020 10:44:32 GMT

Could you show us a sketch please, Aditi?

Re: Create sloped butterfly roof

Laszlo Nagy — Mon, 07 Sep 2020 12:52:01 GMT

In 3D, you can create Roofs by specifying 3 points of the Roof ("Single-Plane" Geometry Method with "Complex Roof" Construction Method). This way you do not have to figure out exactly where the Pivot Line needs to be and what orientation it should have.
You can create other elements a node of which is at one of the locations you need to click. That way you can just click on element nodes when specifying the 3 Roof points.

Re: Create sloped butterfly roof

Anonymous — Mon, 07 Sep 2020 14:13:30 GMT

Hi,

I've attached a sketch of what I'm trying to do. I played around with various roof tools and have managed to create a sort of roof that I want but it's in morphs, so I cannot connect my walls to it. This is problemmatic. I modelled a simple pitched roof, then did right click to create separate roofs by splitting into two. This then allowed me to give a negative pitch to each slope. That solved the butterfly part of the roof. But then I also needed to slope the whole butterfly roof by 7 degrees, which it wouldn't let me do unless I turned the roof into a morph. But once I turned it into a morph, I couldn't attach my walls to it...
Any suggestions?

Re: Create sloped butterfly roof

Anonymous — Mon, 07 Sep 2020 14:40:53 GMT

You can do this with the regular Roof tool. To give the 7 degrees pitch you will have to rotate the Roof Pivot Line. The tricky part is to know what is the Roof Pivot Line rotation that will generate the 7 degrees pitch. But you can always use the trial&error method.
Another solution would be to use the new Beam Tool with a butterfly complex profile.
Hope this helps.

Re: Create sloped butterfly roof

Laszlo Nagy — Mon, 07 Sep 2020 19:01:21 GMT

Look at the attached screenshot.
I have created to zero-thickness Roofs with 5-degree slope. They have a transparent Surface for better visibility.
Then, at the point they join, I placed another Roof with 7-degree slope.
You can see that on the left.
Then I defined the Roof Pivot Line by clicking points 1, 2, and 3, then drawing the Roof Outline.
The right side shows the result.
After the Roofs are done, the zero-thickness Roofs can be deleted.

Re: Create sloped butterfly roof

DGSketcher — Mon, 07 Sep 2020 19:30:29 GMT

Or draw a V Shell, 3D rotate it to 7 degrees and add the required contour. So many options...

Re: Create sloped butterfly roof

Steve Jepson — Fri, 11 Sep 2020 16:34:40 GMT

DGSketcher wrote:
Or draw a V Shell, 3D rotate it to 7 degrees and add the required contour. So many options...

Yes. And they may or may not be related to how it all works with Interactive Schedules.

Modeling for just the sake of graphics and geometry is one thing -- modeling for that AND the Interactive Schedules should not be another - but quite often it is. This is because there are too many inconsistencies with the functionality of the Elements and the Interactive Schedules. I like having the different Tools for modeling these things but they should all function exactly the same way as a Basic, Composite, or Complex Profile and with the angle and rotational functions. That does not seem like it would be very difficult to do. In theory, I think you should be able to model the entire building with just a Beam, Wall, Slab, or a Roof.... + the Windows, Doors, Skylights, Objects of course. You just choose how you want it to be initially oriented in the model relative to the Plan View. We are not that far way from being able to do that are we ?

Re: Create sloped butterfly roof

tonyyy — Mon, 13 Jun 2022 19:32:57 GMT

How did you rotate the roof pivot line? Im trying to create something similar but I cannot seem to find a way of rotating the roof.

Re: Create sloped butterfly roof

Barry Kelly — Tue, 14 Jun 2022 01:48:46 GMT

You simply drag the end node of the pivot line (single plane roof).

Or you can rotate the entire roof and re-adjust the boundary points.

But either of these methods, you will have to figure out where you need the pivot line located.

Use the 3 point placement method Laszlo mentioned.

Determine the height of your roof at 3 known points - use walls you already have in place or add extra columns or walls just to get the heights you need.

Then place the roof in 3D, single plane roof with complex (polygon not rectangular) construction method.

The first 3 points you place will determine the pitch of the roof and then you define the perimeter shape.

You can pick any points for the perimeter and you can adjust it afterwards as well.

Barry.

Re: Create sloped butterfly roof

tonyyy — Wed, 15 Jun 2022 18:40:31 GMT

Thank you! The 3-point placement with varying column heights worked like a charm.

tony