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If you ever wondered what is taking James Cameron so long to produce the Avatar sequels. Here is some insight. He is definitely trying new things and pushing the envelope. Apparently, he spent most of last year just trying to figure out how to do underwater shots. If you understand motion capture and it's relation to 3D, you will appreciate the problem.
http://collider.com/avatar-sequels-underwater-filming-explained-james-cameron/#motion-capture
Here is some light reading about motion capture. If the dots being recorded shift in refraction underwater, then the 3D gets all messed up and out of alignment.
https://www.engadget.com/2014/07/14/motion-capture-explainer/
http://collider.com/avatar-sequels-underwater-filming-explained-james-cameron/#motion-capture
Here is some light reading about motion capture. If the dots being recorded shift in refraction underwater, then the 3D gets all messed up and out of alignment.
https://www.engadget.com/2014/07/14/motion-capture-explainer/