“No matter how much I may work a 3d piece to death, it’s never finished until I spend an hour on it in Post. “Fixing in Post” is just a fancy way of saying you don’t have to skills/time/patience/means to deal with an element during the piece’s creation, and instead you address it post-process in a more hands-on program, like Photoshop.”
http://www.3dtotal.com/pages/tutorials/photoshop/3d_Image_touch_up/Touching_Up_A_3d_Image_01.php