I just recieved Carrara 3 last week so I'm a new kid. I made a glass bowl filled with water with a glass in the bowl. (It's an illustration of a primitive still.) All were made with the default glass shader. The backgroundI is the basic bi-gradient for t. I used four light bulbs to light it all . Three in front and one in back. All light bulbs intensities are cranked up to 400 plus. After rendering, the glass objects look black with one or 2 tiny highlites.. I would think I should see more of the glass bowl. What am I missing about lighting a scene with glass in it?