how do you make a 3D movie? the kind with 3D glasses?

Answer 1

First of all, IMAX is quality. Each frame of the movie is nearly the size of the film used in a 4" by 5" camera. The reel of film for the projector is so big it lays on a table. The screen is the size of a basket ball court. The sound system is always multi channel stereo from several CDs. It is reproduced through numerous speakers around the theater and from behind the screen. Sounds can appear to come from almost any source.
How do things
appear to
jump out of
the screen? Stereoscopic photos and movies, popularily known as 3D, are made with two cameras, each recording an image for each eye. Consequently, true color stereo requires two projectors to shine on the screen. With a separate image for each eye, one can see depth. Images 'float' right out of the screen in front of your face.
I watch two
movies? Well yes, and special polarized glasses seperate the two images. Lets explain how these two seperate images are projected first.
In this example,
the top projector
is for the left eye. The image for the left eye, whcih was made by the left camera, is projected onto the screen through polarizer #1 indicated by red arrows Think of a polarizer as a screen or filter which is so tiny that it only lets light waves pass through which go from the lower left to the upper right. .


Likewise, the image for the right eye, whcih was made by the right camera, is also projected onto the screen through polarizer #2. This polarizer allows only light waves going from the upper left to the lower right to pass through. Indicated by the red arrows.
The red arrows, (light waves), from the two images shine down onto the silver screen #3 making 2 pictures on the screen. The reflective surface of the silver screen bounces the light back out at nearly the same direction, and polarization, that it came from.
The two images remain polarized.

#4. A magnified view of the screen shows facets, like the bottom of a diamond which bounce the light (red arrows) back out. The screen also has holes in it to let the sound pass through.


.
How are the two
pictures
seperated? Remember how the 2 projectors were polarized to project light waves going only in one direction? Likewise, each lens of the cross polarizing glasses #5 accept light only in one diagnol direction. The left lens accepts light waves oriented from the upper right to the lower left.
Likewise, the right lens accepts light waves oriented from the upper left to the lower right. As indicated by the red arrows.

Magically, the left lens blocks the image for the right eye. And, The right lens blocks all of the image for the left eye. This blocking is represented by the grey arrows.

That is how the two distinct images are seperated for each eye creating depth. Anything can come right out of the screen and appear to be in your lap or over your head.

See "How Polarizers Work" to intensify color in photography. Then some Stereo photos.
Visit for more... CNN has an interesting article about the first 3D movies, (in a new window). I believe the first ones were with red and green analglyph glasses.

Answer 2

I used to as a kid but now I need to wear glasses and getting those 3D glasses over mine and just a nightmare.

Answer 3

you film everything through 2 cameras seperated by a few inches

1 camera has a red filter the other a green filter

when the movie is played back both images must be projected

Answer 4

They film it with two cameras at different focal depths, with red lens on one and green on the other. That is why the glasses have the colored lense. And why it can give you a headache, since each eye is seeing a different depth.

Answer 5

Special everything. Cameras, film, et cetera.
Good Luck!

Answer 6

change colors to red and blue