How does the Tru 3D work?

Question by questionasker456: How does the Tru 3D work?
How do they make these movies 3D? Can it only be done in a theater? Can you find these 3D images/videos online?

Best answer:

Answer by Tony R
That is a loaded question but here it goes. First you had the anaglyph or red and blue 3d. Then in the late 1930’s polarized 3d was invented that used the glasses that look like tinted weak sunglasses. The red and blue was still used somewhat in the 1940’s and then polarized was almost all that was used in the 1950’s. Polarized is considered better because it doesn’t distort colors. The only drawback is it will make the movie slightly darker because each lense has to block certain light waves. Red and blue since the 1950’s has only been used for television because it can’t do polarized. 3d dvd’s like polar express use red and blue, but in theaters this movie was polarized.

Now to get that 3d effect they use a camera with two lenses spaced the same distance as the average human eye and film two movies at the same time. Then both images are projected on the screen at the same time. Now you have double images on the screen. As something gets closer to the camera lense the images get further apart. When you look at something up close your eyes have to cross. So to get your eyes to cross so something looks closer to you your left eye has to look at the right image and the right eye has to look at the left image. So each lense of the glasses has to block the correct image. As the images get further away they merge as one image. Then as they go into the background the images pull apart again but in reverse. Now your right eye looks at the right image and the left eye looks at the left image so your eyes uncross or become more parallel, thus these things look further away, just like in real life.

Right now like I said polarized can not be done on television or monitors. So you have to use the red and blue glasses for those, which videos can be found on youtube and other sites for them. Sometimes it is hard to get these to work because the red and blue color in the video has to match your glasses so the television has to have the tint setting just right. If one or both lenses get both images coming through them the 3d effect won’t work.

Now for many years there has been a convertor box around for the old tube televisions called field sequencial 3d. That uses shutter glasses where each lense flashes alternately very fast at the same time as the tv so each eye gets the correct image. The even horizantal lines of the tv use the left image and the odd lines use the right or something like that, and the left image has to flash on when the left lense is open and the right lense is closed. These don’t work with plasma or lcd. Also some imax theaters use shutter glasses as well, or have in the past. Havn’t been to one that uses them for a long time. They had batteries and radio signals tell each lense when to open and close.

Now polarized lenses just block light waves without flashing and don’t need battery power or to be plugged in like shutter glasses. Each double image use lines in the light waves, one with up and down lines in the light and the other uses side to side lines and then one lense has up and down filters and the other has side to side filters to block the correct image.

They are planning to make 3d televisions that use something other than the red and blue 3d. Probably the shutter system is what they will use but that is still up in the air.

Also I didn’t mention this but the red and blue glasses use color to block images. One image is red and the other blue and then the lenses block out the correct image.

What do you think? Answer below!