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Within stereoscopy, the term T is used to denote the distance between the human eyes, which are known as the interpupilary or inte rocular distance. TC however is used to denote the space between a stereoscopic cameras head lenses axes and is known as the interaxial.

Tautomorphic image
This is a stereoscopic image that shows the original scene to the audience exactly as it would have been seen in reality; i.e., with the same positions of scenic elements, apparent scale and a stereo magnification of x1 for each subject in the viewer.

Taxiphote viewer
The taxiphote viewer is a form of cabinet that was created for viewing a collection of stereograms in sequence.

Teco Nimslo
Is a camera that uses the Nimslo format; however it has been modified by Technical Enterprises so it only exposes two frames per exposure as opposed to the quadruple exposure needed for lenticular processing.

Theater Space
This relates to the area that appears to be in front of the screen or out into the audience. It can also be known as ‘audience space’. Images that have a negative parallax will appear like they are in the theater space. However, the boundary between the screen and theater space is the plane of the screen and has zero parallax.

Therapeutic 3D viewing
Therapeutic 3D viewing is the use of 3D material to improve visual skills such as; depth perception, binocular coordination and eye teaming.

When described in stereo usage it is an early type of stereogram on translucent paper within a card frame. It is usually tinted and has been known to have pin-pricked highlights designed for viewing with backlighting.

Toeing-in is the technique of causing the optical axes of twin planar cameras to converge at a distance point that is the same to that of a desired stereo window.

Virtual reality environments use a 3D tracking system in order to track the user’s body movement. There are numerous types, such as; magnetic, optical and ultrasonic tracking systems.

Traditional photogrammetry
Simply put, this is the use of film photography with analytical or analogue stereoplotters.

Transcoding is the process of converting one 3D video file into another format. For example; converting a field sequential 3D video into a column interleaved image data file.

This is the changing over of the inverted images that are produced from a stereo camera to the correct vertical, left and right presentation which is required for normal viewing. This can be achieved optically by a transposing camera or viewer, and mechanically through the means of a specialist printing frame. A manual option is also available and can be done during the mounting of the images.

Tru-Vue is the propriety name of a commercial stereo transparency viewing system which shows a series of views in a film strip sequence on a single card mount.

Twin camera stereo photography
This kind of stereo photography uses two monoscopic cameras which normally have shutters and other various components connected externally or internally to them by electronic or mechanical means. An advantage of this style of photography is that it uses common formats (e.g. medium format and full frame). It is also able to achieve a variable stereo base. However some drawbacks include difficulty with matching cameras, film and getting a normal stereo base. To achieve more consistent results camera bars can be used.

Twist is a rotational displacement/movement of one view in a stereo pair in relation to the other image.

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