Double sided materials archviz

i am working in archviz and was having trouble importing geometry from rhino/3ds max to ue5.
we work often with surfaces in the geometry, fx. window glass.
when exported in ue5 the surfaces often cant be displayed, because of different normal directions. i couldnt find the double sided material option.
do we need to make every surface into a polydurface with thickness or is there a workaround? :slight_smile:

With the Output Node selected:

Also, in the Texture Editor, there is an option to Flip Green Channel for normals.