James Cameron's "3D Rules"
1. There is no screen
2. Stereo is very subjective
3. Analyzing stereospace on freeze frames can be misleading
4. Convergence CANNOT fix stereo-space problems
5. Convergence is almost always set on the eyes of the actor talking
6. Interocular distance varies in direct proportion to subject distance from the lens shots
7. Interocular and convergence should both vary dynamically throughout moving shots
8. In a composite, the foreground and background may want to have different interoculars
9. When stereo looks bad to the eye (visual cortex) it is important to eliminate the problems sequentially: Sync, reverse stereo, Vertical mismatch, color/density mismatch, render errors, highlights, image warping, vibrations
10. Some shots just can't be fixed
on 2012-02-05 02:17 by Ben Cain
I'll add my own 3D Rule to this list -
When troubleshooting alignment, start at the front of the lens and work your way back. Check for lash and that the cameras are securely and correctly seated on their plates. You can end up wasting a lot of time futzing with the rig and mirror when alignment and calibration problems are often lens motors that are too close to the mirror box or a camera that isn't fully seated or correctly seated on its dovetail.