Rhino - Twinmotion : Two-Sided Materials

Surfaces not showing up in Twinmotion, while they do show up in Rhino?  Here's why.

https://discourse.mcneel.com/t/how-to-show-same-material-on-both-sides-of-a-rhino-surface-in-twinmot...

The issue is backface culling being on by default in Twinmotion and not in Rhino.

In Twinmotion use the eyedropper tool (top tray of icons) and click on the material.  In the material settings, scroll all the way down to Misc.  Turn on 2-Sided Materials.