Things to take into account when filming 3d: Objects at infinity need to line up with each other if the left and right images are placed on top of each other.
Your eyes are designed to go from parallel to cross, but not wider than parallel. If the display has infinity set at more than 1.5" of separation your eyes will bleed looking at it.
Also, if the two cameras are separated too far and the object being recorded is close, the amount of cross-eye to align the objects will be painful as well.
Lastly, if the tilt and vertical alignment are not perfectly matched your brain will explode.
A *good* 3d movie player will allow you to adjust the horizontal spacing of the left/right eye. This allows you to move the 3d image into or out of the screen. To calibrate it optimally, find the scene with the "deepest" image, and set it so the images are 1.5" separated, so that the left eye is looking at the left image and right eye on the right image.
There is no way to adjust the amount of 3d effect after filming, you can only adjust how far into or out of the TV it is. It's like pushing a yardstick forward or backward. You can move it, but you can't change how long it is.
It's more pleasing to have a behind-the-screen 3d effect, but the difficulty is ensuring the images are never spaced more than 1.5 inches apart. The cameraman cannot control that, because it depends on how big the screen is.
If I arrange my cameras so that the behind the screen 3d effect creates 1.5" spaced images on my 19" monitor, then on a 60" monitor it would be 4.5"! Your eyes cannot look in opposite-than-cross-eyed directions. In nature you would never have a divergence of parallel (looking at infinity)
So for this reason I don't make assumptions about the size of the screen the 3d video will be watched on. I calibrate my cameras so that infinity is perfectly aligned.
Good software will let the viewer push back infinity behind their screen to their desired effect, which will turn out to be about 1.5" of seperation (left to left / right to right)
All pop-out 3d effects come from your left eye looking at the right image, and vice-versa
Here is an example of a media player that allows you to adjust 3d "placement" on the fly
http://www.tridef.com/user-guide/media-player
Edit: I found the feature for PowerDVD:
3D scenedepth: if required, use the slider to adjust the amount of 3D scene
depth on the video image, until the resulting 3D image is optimized for your
specific setup and your viewing experience. The 3D scene depth slider can be
used to adjust the scene depth on both native 3D and TrueTheater 3D
As I said before, find the "deepest" scene and set it so the images are no more than 1.5" spaced apart.
This message was edited 3 times. Last update was at Mar 21. 2012 02:10