Hello I am Eri.
I have a materials problem.
If you turn on “Double-sided” with a material whose surface is inverted and invisible, it will turn black.
（The door part is mainly inverted.）
I think it’s because when I see a similar post, it shows the back side, which is not exposed to light.
Is it possible for Shapespark to solve this problem?
I would like to know if there is the best way.
I would like to fix it on the Shapespark side if possible.
Is there no choice but to modify the surface with CAD to solve it?