Some years ago 3-D movies required the audience to put on special colored glasses to see the special 3-D effects that were on the screen How do these glasses work to produce these effects?

Answer 1

I know that we perceve depth because our eyes get 2 slightly different images which vary because of a slight change in perspective, as a result we get depth perception, 3D cinema works by creating this as an illusion on the screen. Im not going to pretend i achually know, but from what i have seen, i believe this is what happens When a 3d movie is recorded, they use 2 cameras to judge the distance of objects, and points on the surfaces of obects(for a camera filmed movie) in the same way having 2 eyes allows you to judge distance(and this is why it works), then they convert these 2 films into a single film in which each is tinted in a different colour, each movie has to be tinted in colours which are distinctly different on the light spectrum, because the 2 cameras were used the distance between the same point on each image vaires, and because of the glasses, each eye can only see a particular image, as the colour of the lens covering one eye matches the colour tint of the picture for the other eye, that eye cannot see that particular image, this gives the illusion of depth.

Answer 2

3-D glasses work by separating the images meant for each eye using different colored lenses. One lens filters out certain colors to ensure each eye sees a slightly different image, creating a sense of depth and achieving the 3-D effect. This gives the illusion of objects appearing to have depth and be closer or farther away within the screen.