page_title: MotionParallax3D
section_title: Principles
hierarchical_section_title: MotionParallax3D / Principles
caption_attribution_description: English: MotionParallax3D display - screen image
context_page_description: The MotionParallax3D displays are a class of virtual reality devices that create the illusion of volumetric objects by displaying a projection of a virtual object generated to match the viewer's position relative to the screen.
context_section_description: MotionParallax3D displays contain one or more flat or curved screens. These screens have different sizes, shapes, and mutual disposition depending on the form factor of the device. The projections of virtual objects are formed so that the virtual image the user sees looks exactly the same as the image that would be seen if the virtual object actually existed. In order to display the correct projections of virtual objects, the virtual reality system requires the current coordinates of the observer's eyes.
  In contrast with stereo displays involving only binocular vision, the MotionParallax3D displays utilize one of the most important principles of human spatial perception—motion parallax. Motion parallax is a displacement of the parts of the image relative to each other with the angular velocity proportional to the distance difference between the parts of the image and a viewer when the relative position of the viewer and the observed object changes. The MotionParallax3D displays use this mechanism of perceiving volume by constantly changing the image displayed based on the current coordinates of the user's eyes. Due to this, the virtual objects are shifted relative to each other and relative to the visible real objects according to the laws and principles applying to the real world's objects. It allows the brain to build the a holistic view of the world containing both real and virtual objects with indistinguishable behavior. Most MotionParallax3D displays are based on stereo displays and display separate images to the left and right eyes. This gives a substantial advantage in building a complete system of virtual reality, but is not necessary for the perception of volume since the motion parallax mechanism alone is enough for the brain to perceive virtual objects as having a definite shape, volume, and a distance from the user's eyes.
caption: The projection of a virtual object displayed on the screen
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