One atlas for multiple meshes

[wild radish]

I have a blender file with:
Floor meshes (Full, Corner, Edge)
Wall meshes (Straight, Corner, Doorway cutout, Window cutout)
and a Door object.

They all share one atlas in blender, and one material - but how can I make this so in Godot

[wild radish]

My intention is to have all* my meshes share one large atlas, though I assume I'll want different material properties for some of them.

• excluding npcs and character mesh, and some objects.

I'll probably want to make a character atlas for that.

[midnight mist]

So you want to stitch all of these textures from the materials into a single atlas?

[wild radish]

Rather I have them as a single atlas but when I export it and import it into godot it makes a new atlas per mesh

[midnight mist]

It creates an image per material since each material has its own texture.
Materials should not be trying to all share a single texture, that kind of optimization is already done at a lower level.