How do i put instances on multi-storey?

[CQ1841]

Hopefully you can see what's going on here. It's a test scene, but the real application is on a multi-storey building with gardens on balconies. This current limitation is awful! It doesn't work either by using a spline border, or surface-only.

[iToo]

You must use multiple surfaces, one by each height level. Extracted from Forest 3.4 release notes:

- Overlapping of items at different heights is allowed in Generate mode (using multiple surfaces only).

In a distribution using XY coordinates, as Forest does, it's not possible to overlap items in a same surface. This is solved scattering by UV coordinates, one feature that will be added to the next Forest beta releases.