A long time ago I used to map using GtkRadiant and then UDK. Both of these editors had both 2D and 3D viewports at the same time, so you could do your floor plans in 2D and easily do alignment and such, and use the 3D view to get a feel for how the resulting scene looks:
Unity’s editor defaults to a single 3D viewport, which works, but is quite fiddly and frustrating to build complex environments with. I’ve found that Window > Layouts > 4 Split gives me 3 orthographic views and a perspective view, but meshes aren’t visible in those orthographic views, only gizmos, so they cannot be used to map out floor plans and the like.
I’ve poked around in the menus along the top of each viewport and can’t find anything to show meshes. If I switch any of them to perspective, meshes immediately appear, but disappear again on switching them back to orthographic. This suggests to me that Unity has some kind of internal filter on meshes when looking through an orthographic camera, and that it isn’t any other setting hiding them.
Is there a way I can make Unity show wireframes of meshes in these viewports without making them perspective viewports?