Game Development Reference
In-Depth Information
The fixed-support interfaces with or without higher or lower immersion of the
eyes:
Monoscopic or stereoscopic flat screen;
Visiodesk or immersive desk;
Visioroom and visiocube;
Portable interfaces with complete immersion of eyes:
Head-mounted display;
Video eyeglasses;
Semi-transparent head-mounted display.
Many of these visual interfaces offer stereoscopic vision (3D images). We will
explain the problems and solutions of creation of 3D images in the chapter “Stereo-
scopic Restitution of Vision''. Stereoscopic vision, which is often considered as simple
to use, remains a technique which is difficult to use correctly.
In the following paragraphs, we will focus only on the techniques already
marketed. We will not cover the holographic techniques, which are not yet used
commercially for animated images. It should be recalled that holographic images,
unlike photographs, provide a representation of an object which changes with the
observer's point of view. In these images, the perception of depth is thus greater thanks
to the different position of the eyes, when the observer turns around them. Using the
holographic technique, we can currently obtain very good quality colour images of sta-
tionary scenes. We will also exclude systems that provide three-dimensional volumetric
images, which are spectacular but less immersive (presented in brief in the annexe at
the end of the chapter).
The devices available in the market do not always answer the problem of desired
visual immersion. The VR device designer should not categorically rule out (for conve-
nience or by ignorance) the possibility of designing his own interface. At the Robotics
Centre of the Ecole des Mines ParisTech, we have often worked on this solution by
using video projectors (monoscopic or stereoscopic) which make it possible to develop
a custom-made architecture and design of the visual interface. The new monoscopic
or stereoscopic flat screens, which are sufficiently large (about one square meter), can
also serve as the foundation bricks of a custom-made visual interface.
11.2 VISUAL INTERFACESWITH FIXED SUPPORT
11.2.1 Monoscopic computer screens
A flat screen of a standard computer, which is essentially monoscopic, is often used for
different domains closely related to virtual reality. Video games, CAD, etc. mainly use
monoscopic computer screens. It should be noted again that this type of screen does
not yet have sufficient resolution in comparison to the visual acuity of humans. We
thus need to wait longer for screens with a resolution of at least 3000 to 5000 pixels
horizontally, according to the field of vision used, which depends on the distance
between the observer and the screen.
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