I want a built-in method to calculate room paint face, too.
And I want Autodesk to remake the room model by:
1. Room perimeter should only calculate only by the sides connecting with wall or column.
I don't think there is any Architect would paint on the air.
2. The built-in method to calculate side faces should have an option to auto minus doors and windows face area.
3. Room upper don't stop by Ceiling. Ceiling finish and upper finish is different, both of them should exist as a built-in parameter. Sometimes we paint on the upper concretes first and make ceiling after.
4. Get the concrete beams correctly, or at least see them as floors in upper or lower boundary.
5. I'd like to set room finish by the "Materials and Finishes" category even if they are not really shown on the 3D model. A new category "Not really Materials" looks more weird for me.