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Reference Plane options for Roofs

Laszlo Nagy
Community Admin
Community Admin
Slabs now have Reference Plane, which can be set to Top, Bottom, Core Top, Core Bottom. Additionally, we have commands to modify the reference plane location of an existing Slab.

I wish to have these same options available for Roofs as well.
One common scenario where this would be helpful can be seen in the following thread:

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Aaron Bourgoin
This feature should be added if for no other reason than it reinforces the long-held Graphisoft ArchiCAD ethos of all tools working the same way.

Similarly, slabs and roofs could be interchangeable while walls, beams and columns could inherit x:y sloping parameters.

This shouldn't be an incremental change stretched out to the release of ArchiCAD 23.

worksheet and detail windows are the same thing with different names. Why isn't that the case with the building 'primitives' as well?
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Aaron Bourgoin
Roof Planes also need to follow the same rules for Priority Based Connections as Slabs. I've recently discovered this is not the case.
Think Like a Spec Writer

AC24-7006 / USA AC25-5010 USA

Rhino 7 Mac

MacOS 11.6.5

Eduardo Rolon
There is a reason that Roofs do not follow PBC's like Slabs but I can't find the reference. Because of that they included the following command:
Merge Elements: Roofs, Shells, Morphs
Use the Connect > Merge Elements command to enable priority‐based intersections among any number of Roof/Shell/Morphs and other elements. (At least one of the merged elements must be a Roof, Morph or Shell.)
Note: Alternatively, you can use Roofs and Shells to trim other elements (not just merge them): this is another way to enable priority‐based connections for Roofs/Shells, as well as physically trimming the target element.
eduardo rolón AIA NCARB
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Barry Kelly
Not only should we be able to set the pivot line (reference plane) to the top, bottom, core, etc., but the height for the multi-plane geometry (additional pivot lines) should be in the same plane.

Currently we have the main pivot line on the bottom surface but the heights for addition levels are measure to the top surface of the roof.
If I am trying to pitch that roof over a wall I know the height to the underside of the roof - not the top surface that will change depending on the roof thickness and pitches.


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I could do with this wish right now. Working on a project where I am adding new roof planes; whenever a roof thickness is amended I then have to spend ages adjusting the new roofs up or down to realign the top surface.
Apple iMac macOS Monterey / AC25UKI (most recent builds)

This is an essential function and straight forward wish!

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