Originally Posted by DaViD Boulet
I realize that. I would assume you know that I do since I've posted about the particulars of IMAX/Real3D polarization countless times.
Oh - I know you do, but you continue to talk about 3D viewing off axis and keep combining Active and Passive as if they are the same which they aren't. IMO - you just can't isolate one item of 3D presentation like the parallax, depth issue. Image brightness has to be included. The glasses are blocking most of the light as it is.
And comparing commerical theater 3D to home 3D can also differ based on your relationship to the screen and your angle of off axis. At home, your off axis angle can be much greater than in a theater.
My point was that even when viewing from the inside the screen area of IMAX or Real3D where brightness is still fine and ghosting is not problematic, being off to the side causes the 3D effect to get a little strange because the left/right differential your eyes are seeing doesn't match up with what your brain expects them to see from that angle.
But the brightness isn't fine - not sitting off axis - say to the extreme left or right. And yes the 3D will look different to someone sitting way off axis versus someone sitting in the screen center position. Been that way for over 50 years.
Since the illusion of 3D is based on the angle-differential of the two "eyes" of a camera that was centered in relationship to the image, as you move away from that center "camera location" the left/right differential that the camera "saw" start to get more and more disassociated with what your brain is expecting your own eyes to see. So the most comfortable 3D illusion will be with your head in the same position as the camera, and it will gradually put a cognitive strain as you move farther and farther away from that point.
That principle applies with 2-channel stereoscopic images regardless of 3D display technology (active/passive).
Again - been that way for over 50 years. Nothing new here.
Note: I'm not saying that 3D won't work for people off to the edge of the screen or off axis. What I'm saying is that similar to the audio image from a 2.0 or 5.1 speaker array, the "sweet spot" for 3D is in the center where it's optimzied to be balanced, and as you move farther away from that point it makes your brain work harder to keep the illusion.
It may work, but at what cost to a person's comfort and enjoyment level?