Hi Paul,
We very often have to split walls and other structures in quite painstakingly manners in order to be able to assign a different material to parts of them.
A very common example would be a wall, where we have a material for the outside like bricks and one for the inside like plaster.
It would be huge if there could be a way to assign the materials to the individual surfaces.
As you can see from the attached picture, Rhino supports this (you have to press ctrl + shift to select a surface...) however Octane just renders one color.
I attached the 3dm file for you to test.
Please, please!
Andreas