Shader lamps is a
computer graphic technique used to change the appearance of physical objects. The still or moving objects are illuminated, using one or more
video projector
A video projector is an image projector that receives a video signal and projects the corresponding image on a projection screen using a lens system. Video projectors use a very bright ultra-high-performance lamp (a special mercury arc lamp), ...
s, by static or animated
texture or
video stream. The method was invented at University of North Carolina at Chapel Hill by
Ramesh Raskar, Greg Welch, Kok-lim Low and Deepak Bandyopadhyay in 199
as a follow on to Spatial Augmented Realit
also invented at University of North Carolina at Chapel Hill in 1998 by Ramesh Raskar, Greg Welch and Henry Fuchs.
A
Rendering (computer graphics), 3D graphic rendering software is typically used to compute the deformation caused by the non perpendicular, non-planar or even complex projection surface.
Complex objects (or aggregation of multiple simple objects) create
self shadows that must be compensated by using several projectors.
The objects are typically replaced by neutral color ones, the projection giving all its visual properties, thus the name shader lamps.
The technique can be used to create a sense of invisibility, by rendering transparency. The object is illuminated not by a replacement of its own visual properties, but by the corresponding visual surface placed behind the object as seen from an arbitrary viewing point.
See also
*
Projection augmented model
*
Projection mapping
External links
Shaderlamps.comMitsubishi Electric Research Laboratories, Shader Lamps, Ramesh Raskar, Greg Welch, Kok-lim Low, Deepak Bandyopadhyay, June 2001
(PDF)
IEEE Computer Society January/February 2007 (Vol. 27, No. 1) pp. 90-96, The Digital Chameleon Principle: Computing Invisibility by Rendering Transparency Frank Nielsen, Sony Computer Science Laboratories
Computer graphics
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