February 22, 2017 at 6:12PM


BLAST FROM THE PAST 3D stereoscopic/anaglyph


Everyone probably faced the same thing. You get really enthusiastic about an idea but keep hitting that technical wall that sets you back.

I want to film a 3D video. But i can not find sufficient information about it online. I understand some of the basics. Beam splitter rig, anaglyph, identical set up. But can not find the right information about alignment and post production.

- What is the rule with interocular distance. If my object is .... meters away what needs to be the space between lenses?

- How do i check if everything is aligned on set?

- How do you edit this in post? and why do you choose side by side or anaglyph?

I still have a bunch of questions but there is probably some technical wizard across the ocean that can help me with this project.

1 Comment

Inter-ocular distance is ideally the distance between the average human eyes.
You can check alignment with a test target, making sure the viewfinders show the same thing. I almost always carry an ISO 12233 target with me.
Post depends on how it was shot and your editor. If you're using a 3D camera and a 3D compatible editor, you shouldn't have to do anything. If you're using separate cameras and an editor that wasn't designed for 3D, you can put the "left eye" on top and make it 50% transparent, then use the crop/position feature to shift both views to get the best match with minimal loss at the edges. If your alignment was good on-set, you should be able to get away with a slight window box and no resizing. Which method also depends on a number of factors. Anaglyph is for systems that weren't designed for 3D. The ideal method is a true 3D interleaved file, which will show the left eye only for incompatible systems and systems that do support true 3D can access both eyes and handle them natively, be it active or passive viewing. Side by Side is not generally ideal except under special circumstances, like some web sites require 3D material be SxS.

I have shot SOME stuff with a native 3D camera that encoded to a single file. It was a snap editing in my 3D-compatible editor, just like working with 2D video. I've also done dual-camera shoots which are a lot more difficult on-set but seem to produce better results. Post is a bit more difficult too but I made a template to expedite the process.

February 23, 2017 at 7:40AM


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