In computers, 3-D (three-dimensional or three-dimensional) describes an image that provides the perception of depth. When three-dimensional images become interactive so that users feel involved with the scene, the experience is called virtual reality. In general, you need a special add-on viewer for your web browser to view and interact with three-dimensional images. Virtual reality experiences may also require additional equipment.

The creation of three-dimensional images can be seen as a process of three phases of tessellation, geometry and rendering. In the first phase, individual object models are created using linked points that are created in a number of individual polygons (tiles). In the next stage, the polygons are transformed in different ways and the lighting effects are applied. In the third stage of 3D modeling, the transformed images are represented in objects with very fine details.

Popular products to create 3D effects include Extreme 3D, LightWave 3D, Ray Dream Studio, 3D Studio MAX, Softimage 3D and Visual Reality. The virtual reality modeling language (VRML) allows the creator to specify images and rules for their visualization and interaction using textual language statements.

3D photography is based on stereoscopy, a technique that gathers two-dimensional information to transform it through a process in a 3D image (three-dimensional).

Our right eye does not perceive exactly the same as our left eye, there is a slight "lag". Stereographic photography is created by presenting "equal" images except for small differences. As with human vision. Putting together the two images to create the illusion is achieved through softwares.

This method was invented in the first half of the 19th century by Charles Wheatstone.

Stereoscopy or 3D images, is used in photography, film and television.