Techniques for producing creative stereo parameters for stereoscopic computer animation

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;

calculating a creative near-parallax value based on the stereo-shift value and the product of the stereo-volume and the near-parallax value;

calculating 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.

2. The computer-implemented method of claim 1 , further comprising:

positioning each camera of the pair of stereoscopic cameras relative to each other based on the creative far-parallax value and the creative near-parallax value;

creating the stereoscopic image of the computer-generated scene with the pair of stereoscopic cameras; and

storing, in the computer memory, the stereoscopic image.

3. The computer-implemented method of claim 1 , further comprising:

calculating a camera separation value and a convergence value for the pair of stereoscopic cameras based on the creative near-parallax and creative far-parallax values; and

storing, in the computer memory, the camera separation value and the convergence value.

4. The computer-implemented method of claim 3 , further comprising:

positioning each camera of the pair of stereoscopic cameras relative to each other within the computer-generated scene based on the camera separation value and the convergence value.

5. The computer-implemented method of claim 3 , further comprising:

positioning a camera sensor of the pair of stereoscopic cameras within the computer-generated scene based on the camera separation value and the convergence value.

6. The computer-implemented method of claim 1 , wherein the stereo-volume value is specified as a percentage value such that: values greater than 100 percent correspond to an amplification of a stereo effect, and values less than 100 percent correspond to an attenuation of the stereo effect, wherein the stereo effect represents an overall amount of parallax in a stereoscopic image of the computer-generated scene.

7. The computer-implemented method of claim 1 , wherein the stereo-volume value and stereo-shift values are obtained as input from a graphical user interface.

8. The computer-implemented method of claim 1 , wherein the stereo-volume value and stereo-shift values are obtained from the computer memory.

9. The computer implemented method of claim 1 , wherein obtaining the set of bounded-parallax constraints comprises:

calculating a minimum scene depth, wherein the minimum scene depth is the distance from the pair of stereoscopic cameras to a nearest point of interest in the computer-generated scene;

calculating a near-parallax value based on a focal length of the pair of stereoscopic cameras and the minimum scene depth,

wherein calculating the near-parallax value includes selecting a baseline stereo-setting entry from a set of stereo-setting entries,

wherein each stereo-setting entry of the set of baseline stereo-setting entries includes a recommended scene depth, a recommended focal length, and a recommended near-parallax value,

wherein for the selected baseline stereo-setting entry:

the recommended scene depth corresponds to the minimum scene depth, and

the recommended focal length corresponds to the focal length; and

calculating a far-parallax value based on the focal length.

10. The computer-implemented method of claim 9 , wherein the nearest point of interest in the computer-generated scene is determined by identifying the closest point on a computer-generated object within the scene over an area that corresponds a middle portion of a camera sensor of the pair of stereoscopic cameras.

11. A computer system for determining a user-defined stereo effect for a computer-generated scene, the system comprising:

a computer memory;

a processor for executing the computer-readable instructions, the instructions for:

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;

calculating a creative near-parallax value based on the stereo-shift value and the product of the stereo-volume and the near-parallax value;

calculating 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 the computer memory, the creative near-parallax value and creative far-parallax value as the user-defined stereo effect.

12. The computer system of claim 11 , the instructions further comprising:

positioning each camera of the pair of stereoscopic cameras relative to each other based on the creative far-parallax value and the creative near-parallax value;

creating a stereoscopic image of the computer-generated scene with the pair of stereoscopic cameras; and

storing, in the computer memory, the stereoscopic image.

13. The computer system of claim 11 , the instructions further comprising:

calculating a camera separation value and a convergence value for the pair of stereoscopic cameras based on the creative near-parallax and creative far-parallax values; and

storing, in the computer memory, the camera separation value and the convergence value.

14. The computer system of claim 13 , the instructions further comprising:

positioning each camera of the pair of stereoscopic cameras relative to each other within the computer-generated scene based on the camera separation value and the convergence value.

15. The computer system of claim 11 , wherein the stereo-volume value is specified as a percentage value such that: values greater than 100 percent correspond to an amplification of a stereo effect, and values less than 100 percent correspond to an attenuation of the stereo effect, wherein the stereo effect represents an overall amount of parallax in a stereoscopic image of the computer-generated scene.

16. A non-transitory computer-readable storage medium including computer-readable instructions that when executed on a computer processor cause the computer processor to determine a user-defined stereo effect for a computer-generated scene, the instructions 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 the computer-generated scene, and

a screen adapted to depict the stereoscopic image of the computer-generated scene;

calculating a creative near-parallax value based on the stereo-shift value and the product of the stereo-volume and the near-parallax value;

calculating 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.

17. The non-transitory computer-readable storage medium of claim 16 , the instructions further comprising:

positioning each camera of the pair of stereoscopic cameras relative to each other based on the creative far-parallax value and the creative near-parallax value;

creating the stereoscopic image of the computer-generated scene with the pair of stereoscopic cameras; and

storing, in the computer memory, the stereoscopic image.

18. The non-transitory computer-readable storage medium of claim 16 , the instructions further comprising:

calculating a camera separation value and a convergence value for the pair of stereoscopic cameras based on the creative near-parallax and creative far-parallax values; and

storing, in the computer memory, the camera separation value and the convergence value.

19. The non-transitory computer-readable storage medium of claim 18 , the instructions further comprising:

positioning each camera of the pair of stereoscopic cameras relative to each other within the computer-generated scene based on the camera separation value and the convergence value.

20. The non-transitory computer-readable storage medium of claim 16 , wherein the stereo-volume value is specified as a percentage value such that: values greater than 100 percent correspond to an amplification of a stereo effect, and values less than 100 percent correspond to an attenuation of the stereo effect, wherein the stereo effect represents an overall amount of parallax in a stereoscopic image of the computer-generated scene.