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Parallax scrolling is a technique in computer graphics where background images move past the camera more slowly than foreground images, creating an illusion of depth in a 2D scene of distance. [1] The technique grew out of the multiplane camera technique used in traditional animation [ 2 ] since the 1930s.
A simplified illustration of the parallax of an object against a distant background due to a perspective shift. When viewed from "Viewpoint A", the object appears to be in front of the blue square. When the viewpoint is changed to "Viewpoint B", the object appears to have moved in front of the red square. This animation is an example of parallax.
Stellar parallax is the apparent shift of position of any nearby star (or other object) against the background of distant stars. By extension, it is a method for determining the distance to the star through trigonometry, the stellar parallax method .
Parallax mapping, a 3D graphics rendering technique; Parallax Propeller, a 32-bit microcontroller with eight CPU cores; Parallax scrolling, a scrolling technique in computer graphics where the background content (for example, a background image of a website or app) is moved at a different speed than the foreground content while scrolling.
Diurnal parallax is a parallax that varies with the rotation of the Earth or with a difference in location on the Earth. The Moon and to a smaller extent the terrestrial planets or asteroids seen from different viewing positions on the Earth (at one given moment) can appear differently placed against the background of fixed stars.
Before the multiplane camera, animators found it difficult to create a convincing tracking shot that kept perspective (for instance, a moon of constant size in distant background) by using traditional animation methods. Furthermore, the act of animating the forward motion was becoming increasingly costly and time-consuming.
Stellar parallax motion from annual parallax. Half the apex angle is the parallax angle. Parallax is an angle subtended by two lines crossing a point. In the upper diagram, the Earth (blue-filled circle) in its orbit sweeps the parallax angle subtended on the Sun (yellow-filled circle).
Binocular disparity refers to the difference in image location of an object seen by the left and right eyes, resulting from the eyes' horizontal separation ().The mind uses binocular disparity to extract depth information from the two-dimensional retinal images in stereopsis.