It is basically the cutout, but instead of using an image, it is a set of x,y,z values for the perimeter of the object which tells the game where to cut out the wall. So instead of a simple image that can be made in less then 5 minutes, i need to work out a meshes dimensions, factor in a border, and input that into these values. It will be fine for straight-edge windows, but this will be a pain in the ass for anything curved or circular (even angled like my vaulted ranch set). I will most likely have to reference a blender shape (like a polygon of some kind) and take the coordinates then manually input those into the resource. I fear this may not be easily done with a batch fix because of some of that complexity (mainly for the odd-shaped windows).