Transparent materials in the rendered viewport mode aren’t working right. This is using a glass material:
Raytraced renders correctly:
I don’t know if it has anything to do with the fact that the rendered viewport can’t find the texture for the floor. I am working on this at home from my USB drive, and if I look at the path to the texture, Rhino has found the correct location (only the drive letter changed), and cycles is rendering it. Also, Rendered viewport is rendering the wood texture OK, so its a mystery as well why it isn’t finding the floor texture.
