You're spot on with what you say. Middle of the floor, not a problem. Free standing stoves are ideal. The ideal solution would be a feature where I can apply a material to the wall around the stove (my mask) and for Sketchup to ignore everything behind it. I'm assuming this isn't something that could be achieved via a plugin? It might be easier to go back to Unity and see what I can do there. Thank you all for your suggestions. Kindest regards, Reagan.