double sided" mesh option in 2.8 - Materials and Textures - Blender Artists Community
Is it better to have models that have double faces or is it better to have a two-sided material instead? - Pipeline & Plugins - Epic Developer Community Forums
Plane objects with... double face - dichitoarchitetto.it
How to Create a Double-Sided Material in Blender - Lesterbanks
Normals — Blender Manual
how to create double sided materials in blender - YouTube