You have to increase the depth map resolution, which i odn't know how to do.....lol....but i'll bump you're thread and someone will help ya with that.

Whats up with you're weird Cell shaded look on you're cars material? Its weird, i think a blinn might look much better. Unless you wanted it to look "Drawn".

oh and BTW, you're tires appear to be either shiny or reflective = P