Hologram
From SGCommand
Holography is the science of producing holograms, an advanced form of photography that allows an image to be recorded in three dimensions. The technique of holography can also be used to optically store and retrieve information.
The Ancients had technology to make a solid holographic guardian and holographic sword, as well as a fully interactive teaching program and most probably other similar programs. The Asgard also developed a holographic pedestal to allow them to communicate with others by projecting holograms onto nearby ships or broadcasting them to other projectors light-years away. (SG1: "Thor's Chariot", "Red Sky", "Revelations", "Avalon", "Camelot") Other minor races also developed hologram technology over time.
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[edit] Ancient
Ancient holograms are the most advanced, besides the ability to project over long distances, later versions could create sound like the Asgard versions, but unlike the Asgard holograms, Ancient ones can become solid and even create realistic physics simulation such as the holographic sword (weight, friction, etc.). Ancient ships also possess holographic HUDs and can project holograms with sound onto other ships even when travelling at 99.9% light speed, although this speed does hinder their ability to receive sound. Atlantis has a whole room which contains a large hologram emitter to display holographic informations from the Atlantis database, and at some point the Tau'ri upgraded it to cover the entire city.
[edit] Aschen
The Aschen possess advanced holographic projectors, which are used to display informations onboard their Harvesters or in science laboratories.
[edit] Asgard
The Asgard can create holograms that can project themselves, with sound, over long distances (for example, a planet's surface to a ship.) They can also be transmitted and then recreated from another projector to work as a 3D communicator, even through a Stargate. This technology is later copied by the Goa'uld]] and the Tau'ri.
[edit] Gadmeer
The Gadmeer terraformer has a large holographic projector in its control room, which allows people to display informations from the database in 3D.
[edit] Goa'uld
The Goa'uld also use hologram technology for various purposes. They are most frequently used in HUDs on their Tel'taks and the Peltacs of Ha'taks. Besides these uses there exist smaller devices to create holograms for different purposes, like the Vo'cume projector, which can display a large hologram of a person. The Tok'ra also possess a small device capable of displaying holograms. After Anubis stole knowledge from Thor using a Mind probe, he and Ba'al began to incorporate Asgard holographic technology onto their ships.
[edit] Tau'ri
Due to the fact that the Tau'ri got technology from the Asgard they are also able to use holographic technology, although they rarely use it.
[edit] Tollan
The Tollan are known to possess handheld holographic devices, which are able to create a small holographic image of a person playing back a message.
[edit] Wraith
The Wraith use hologram technology in form of computer screens to display informations onboard their ships. Their are also used in the HUDs of Wraith Darts.
