I'm trying to render a room that has sheetrock walls. I saw only one post that even mentions sheetrock. How do I specify it? How can it specify it will be rendered in a particular color?
You'll have to create your own, using the Material Editor. I'd suggest "Plain" Pattern
(here's where you specify the color); "Matte" Reflectance
(with both parameters set to 1.0 for TCad versions 16 & 17, or 100 for earlier versions -- and be prepared to adjust these values after a trial render); and "None" Transparency
, and Wrapping