Check the attached image for the steps to achieve this:
1. Draw the desired Roof Pivot Line using lines and arcs. Make sure it is a closed polyline. (Or, you may have the geometry already modeled using Walls.)
2. Using the Magic wand, create a Multi-plane Roof based on the drawn lines and arcs.
3. Click the 2 end Pivot Line segments and use the "Custom Plane Settings" command of the Pet Palette to convert them to Gable segments.
The number of Roof Plane segments generated within the Multi-plane Roof depend on the Magic wand settings.
Use the "Linear Segment" option on the right and set your desired resolution on the left. As you can see the Roof generated in the upper right corner of the image has a higher resolution than the Roof below it. It was generated with higher Magic Wand resolution settings.
P.S.: You could also just draw a rectangular Multi-plane Roof pivot line, then edit its shape using Pet Palette commands, but I think it would take more time.
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy
AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac27