1. A computer-implemented method for determining a user-defined stereo effect for a computer-generated scene, the method comprising: obtaining a set of bounded-parallax constraints including a near-parallax value and a far-parallax value; obtaining a stereo-volume value, wherein the stereo-volume value represents a percentage of parallax; obtaining a stereo-shift value, wherein the stereo-shift value represents a distance across one of: an area associated with a camera sensor of a pair of stereoscopic cameras adapted to capture a stereoscopic image of the computer-generated scene, and a screen adapted to depict the stereoscopic image of the computer-generated scene; calculate a creative near-parallax value based on the stereo-shift value and the product of the stereo-volume and the near-parallax value; calculate a creative far-parallax value based on the stereo-shift value and the product of the stereo-volume and the far-parallax value; and storing, in a computer memory, the creative near-parallax value and creative far-parallax value as the user-defined stereo effect.