Materials in Thea for Rhino can be created in the same way you create Rhino materials.
Important: To be able to see the new Thea Material option, Thea Render needs to be the active render engine.
From the top menu select: Render > Current Renderer > Thea Render
There are two ways to add a new Thea Material in the material list:
Thea for Rhino offers two ways to edit Thea Materiels. You can either use Material Presets as a starting point or use the Advanced Material editor to have complete control over the material parameters and make use of the advanced layering system that Thea makes use of.