Sloping Recess

[ArcAngel]

Can anyone advise how I can create a window like the ArchiCAD Wall Niche but which can slope as a parallellogram (top and bottom horizintal, sides sloping and parallel)?

I'm trying to represent a diagonal joint in rainscreen cladding.

[Erika Epstein]

You could do it with an angled beam.
Beams will cut holes in walls.
And/or you could do it with a morph or wall and adjust its material priorities. And/or with a SEO.