3D movies – how it works


What is the illusion of three-dimensional cinema? What is its history and future of 3d movies ? Here are the details.

3d movies

We put on 3D glasses and what’s next? How does 3D cinema work? /press materials.

Cinema, from the moment of birth, is constantly evolving – from adding sound to the transition from black and white to color. Three dimensions in the cinema are nothing new, but only today they not only gain in popularity, but above all become standard. Let’s see how 3D cinema evolved and what it really is.

Our brain – 3D pillar

3D movies are nothing more than clever scams aimed at our brain. Filmmakers use the fact that the left and right eye see the object at different angles. It is only the brain that connects both these images together, creating spatial visualization.

3D cinema sends a picture other than the one sent to the right to the left eye. The differences seemingly are not large – it is enough that specific objects are shifted relative to each other (shown from a different angle). More is not needed to create the illusion of space.

However, the 3D effect will not be used by people whose eyes can not connect both images in 3D visualization – it is about 5 percent. population. The reasons for such problems are eye defects and brain work.

The era of anaglyphic cinema

3D cinema really have debuted in the 50s It was then that a theater zawitały anaglificzne cardboard glasses with red and green filters (or rather, foil). The film was presented with the help of two projectors – they operated synchronously, sending a different picture to each of the filters. Thanks to this, a three-dimensional impression was created.

50 years ago, such solutioncould have entertained movie fans, but this anaglyphic cinema never got out of the ghetto, which was to treat it like an ordinary toy and an entertainment add-on. With time, this technology has gone from household to cinema, but it was limited to simple 3D treatments. Due to the lack of potential and problems with transmission (headaches among viewers, nausea) anaglyphic technology went to the basket.

Alternate sequence of frames

The solution is that the viewer is bombarded with 48 frames per second (the feature film has 24 frames per second). However, thanks to special glasses with active shutter, successive frames are either transmitted or retained, depending on the eye to which they are to reach. From the sequence of director’s shots, the brain constructs a spatial picture.

Special glasses have two LCD panels built in and require a separate power source. Cinemas do not essentially use this technology. We will look at it in Nvidia 3D Vision glasses and in planned solutions for video games. This solution is also used in cinemas – it is called XpanD.

Polarizing filter technology

Several 3D formats mean that there are many types of glasses on the market.  RealD / AFP equipment in the picture

Several 3D formats mean that there are many types of glasses on the market. RealD /AFP equipment in the picture.

The solution is used primarily in movie theaters, based on the polarization of the light wave. In this solution, images from projectors pass through polarizers. The glasses have special filters that transmit light waves with a fixed polarization. As a result, each eye receives appropriate information, and the brain transforms the sent signals into one image. This technology does not require glasses with its own power supply. This is a solution created by RealD.


This technology uses solutions similar to RealD – the difference, however, is that the movie recorded in this format has an analog format. Although IMAX has introduced digital projectors, the development of 3D effect in IMAX technology still remains very expensive. The film “Avatar” was the first full-length production created with IMAX 3D in mind.


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