The Science of 3D Film Technique

We see the world with two eyes, which is why we see objects in three dimensions: length, width, and depth. The distance between our two eyes plays a major role in this.

In pictures printed on paper or camera photos, depth might appear due to light and color mixing, but they are actually only two-dimensional. The image captured by our left eye is slightly different from the image captured by our right eye. When these signals reach the brain, the difference is merged, and we experience a single 3D view. Scientists used this unique trait to create 3D pictures and movies.

In the old days, 3D pictures were common. A photo was taken, then the camera was moved by the distance between the eyes to take a second photo. These two photos were placed side-by-side. When viewed together, they merged to create a 3D scene. These were called stereograms, and the glasses used to see them were called stereoscopes.

Today, 3D movies are no longer a surprise. There are many 3D techniques. Previously, color filter glasses were used (one lens blue and the other red). Today, theaters mostly use the polarized method. In this method, two projectors cast images onto the screen. The images for the left and right eyes are shown alternately, and polarized glasses allow our brain to see them as a single 3D image. One must keep their gaze steady to get the full effect.