In practical application, the left-right movement is generally described by X axis, the up-and-down movement is described by Z axis, and the back-and-forth movement is described by Y axis, thus forming a three-dimensional sense of human vision.
Three dimensions are composed of one dimension and two dimensions, that is, two dimensions only intersect in two directions, and one dimension and one dimension are superimposed to get three dimensions.
Three-dimensional is three-dimensional, and the front, back, left, right and up are only relative to the observation angle. There is no absolute front, back, left, right, up and down.
The main characteristics of three-dimensional:
1, the spatial target is defined by three coordinate axes: x, y and z, and it is obviously complicated to divide the spatial relationship based on the volume; ?
2. It can express the objective world more truly;
3. Be able to analyze and operate in three dimensions.
Three-dimensional application
1, 3D animation
Three-dimensional animation, also known as 3D animation, is not limited by time, space, place, conditions and objects. It uses various forms of expression to show complex and abstract program contents, scientific principles and abstract concepts in a centralized, simplified, vivid and vivid form.
The way 3D animation technology simulates real objects makes it a useful tool. Because of its accuracy, authenticity and unlimited maneuverability, it is widely used in many fields such as medicine, education, military affairs, entertainment and so on. In the production of film and television advertisements, this new technology can give people a refreshing feeling, so it has been welcomed by many customers.
Three-dimensional animation can be used to make special effects (such as explosion, smoke, rain, light effects, etc.). ), special effects (crash, deformation, illusory scenes or characters, etc. ), advertising product display, title flying and so on.
2, three-dimensional virtual
The English name is VirtualReality, or VR technology for short, which is called VR technology. Suitable for tourism, real estate, architecture, villas and apartments, office buildings, scenic spots, sightseeing, hotels, restaurants, garden landscapes, park exhibitions, museums, subways, airports, stations, docks and other industries.
The biggest feature of virtual reality is that users can interact with the virtual environment, turning passive viewing into more real experience interaction, and applying it in the real estate field, such as "selling treasures".
360-degree real scene and virtual roaming technology have been applied in many projects, such as online house viewing, real estate building cartoons, virtual real estate electronic building books, virtual reality studios, virtual reality stages, virtual scenes, virtual office buildings, virtual business halls, virtual business spaces, three-dimensional virtual house selection, virtual hotels, virtual reality environment performances and so on.
3. Three-dimensional map
Its display is more three-dimensional, probably the reflection of Chengdu. With the permanence that network products generally do not have, the three-dimensional map is convenient for friends at home on weekends to eat.
Refer to the above content: Baidu Encyclopedia -3D