4D film

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4D film is a marketing term that describes an entertainment presentation system combining a 3D film with physical effects in the theatre, which occur in synchronization with the film (note that 4D films are not actually, geometrically, 4-dimensional). Because physical effects can be expensive to install, 4D films are usually presented only at special venues, such as theme parks and amusement parks. However, in Thailand, Mexico , Hong Kong, Nepal, South Korea, and India, and the U.S., some movie theatres also have the ability to present a 4D film, and the film Avatar was one of 10 films that have received the treatment, starting with Journey to the Center of the Earth.. Some of the effects simulated in 4D films include rain, wind, strobe lights, and vibration. The use of water sprays and air jets is also common. A 4D film is not shown in a motion simulator, although some seats in 4D venues vibrate or may move a few inches during the presentation.
Due to the fast growth of movies, video, and the entertainment industry, 3D Theatres have been enhanced by the addition of special simulations. The combination of 3D movies with chair movement (vibration, sway, tilt, drop, wave motion, or movement in any direction) and other chair effects, such as wind blowing, water spraying, leg and back ticklers, is usually considered a 4D experience. Using additional hall effects, such as smoke, rain, lightning, air bubbles, and special smells (for example, fireworks smells at the London Eye's Experience and gassy smells, when the stinkbug sprays it in It's Tough to be a Bug) is often regarded by many as 5D. However, since there is no standard for using these terms, each company uses its own terminology and it is often confusing. It is important to disregard the marketing slogans (4-5-6-7D) used by different companies and to check what is exactly offered for both the visual and sensory experience.

4D Technology:
4D Technology designs and manufactures laser interferometers, surface roughness profilers and interferometry accessories, for accurate measurement of optics, optical systems and precision machined surfaces. Our innovative products utilize state-of-the-art technology that can be deployed in production environments, even in the presence of severe vibration and turbulence. 4D interferometers and optical profilometers are used daily in critical applications in astronomy, aerospace, optical testing and many other industries. 4D's history of innovation has changed how and where interferometric measurement can be used, from unique space-based projects to high throughput production of precision components.