I finally learned to make the characters cast a shadow. I have been trying to figure it out for weeks if not longer. Then I learned that you have to click on the controls of the lamp or light source and set it to make a shadow. But it takes three or four minutes more to process the picture, so that is why the program sets the default to no shadow: so it will render the picture a lot faster.
Xin felt that she was having a lot of psychological problems and went back for another session with the college councilor/psychologist, Dr. Billy. He asked her to sketch a picture of what she felt she looked like so that he could evaluate it and extrapolate nuances that would help him infer behavior patterns and self-esteem. She returned this drawing she made, saying she just scribbled or doodled around and she felt embarrassed because she thought it was such a terrible job of artwork. "And besides," Xin went on to tell Dr. Billy, "I am so ugly! It makes me want to cry when I look in a mirror. I cringe at the sight of my reflection!" The doctor hesitated as he studied the sketch, then looked at her and said, "Well, yes. It is a pretty pathetic drawing. I would suggest that you drop out of college and go join a carnival freak show."