How do they make 3d movies?

Answer 1

Live action 3D content is captured using cameras with two lenses side by side. The lenses capture two images that are from a different perspective in just the same way that our own eyes see two separate images. As an object moves closer to the lenses, so the angle at which the lenses see the image increases. It is this change of angle that gives us a sense of distance of object.

The two image streams are then edited and processed to produce a final 3D program. When they two images are replayed, glasses are used to separate the two images so that our eyes see only one of the two images. In movie theaters, the images are projected with polarized light. The glasses then filter the polarized light so that each eye sees the image intended for it. We now see the two slightly different images and we are able to sense the distance of objects as we see them.

Most television 3D systems use glasses that switch the light to each eye on and off in time with the images on the TV screen. The process is different but the end result is the same.

Animated 3D productions use computer processes to generate 3D models and from there, they are able to generate two images in a similar way to the pair of lenses used in live action film capture.