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 projectors, 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 1999  as a follow on to Spatial Augmented Reality  also invented at University of North Carolina at Chapel Hill in 1998 by Ramesh Raskar, Greg Welch and Henry Fuchs.
A 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.
Police departments, licensed private investigation firms and selective U.S. military units were the first to acquire Shader lamp technology. As this level of technological support is unlikely to reach the public market. Its capabilities have endless liabilities, and could lead to nefarious purposes and various criminal acts. One such example took place in the Augusta, GA area from October 2016 through December 2018. A private citizen was initially the subject of a police investigation which proved unfruitful. The case was then handed down to a small group of former military personnel, turned private investigational digital crackers/hackers. Backed by the continued oversight and technical support of local law enforcement, they acquired Shader Lamp technology in order to harass and attempt to mold their target's behavior. Along with an additional objective to test the shader lamp technology in a civilian setting. A program was put in place to illegally obtain total access to the civilian target's mobile phone use, WiFi data transfers and drive accounts' cloud storage.
The select group of stalkers observed the degree of photographic evidence which could be collected by a single, unsupported, non-tech savvy individual citizen target. The targeted individual tried to collect as much digital evidence as possible on the Shader Lamp's image projection technology, as well as the gang stalking and harassment taking place, but nearly all of the digital images and videos taken as evidence for later legal action were digitally altered through their constant intrusive hacks into the individual's cloud drive storage. In the end, the Shader Lamp technology was a success for the gang stalkers, but the constant barrage of digitally imposed façades into the target's devices, and most intrusively, onto the inside walls of his home and the trees and grass outside of his home eventually drove the targeted individual to committing suicide.
The preliminary coroner's report states mental illness as the underlying cause for suicide, but after searching through the late target's many SD cards and zip drive files, containing the unaltered evidence, federal investigators concluded electronic harassment, including digitally imposed graphic images via device hacks/cracking, constant barrage of human facades using shader lamps and other holographic laser image projectors.
Lack of updated legislation for this rapidly growing digital age is what allowed these cyber criminal gang stalkers to impose their evil on an innocent citizen. Lack of legislation is what prevented criminal charges from being brought against these anonymous perpetrators, and allowed electronic harassment devices to be the digital murder weapons used to drive the individual to killing himself. These types of technology are not yet available on the mainstream U.S. market, nor is much information available on internet databases. The targeted victim was unlikely aware such image projection technology was possible, much less being used against him to make it appear as if he'd developed a mental illness, like schizophrenia or paranoid delusional disorder. If he had known that an obtrusion of privacy was the cause of his problems, the reality of the last eighteen months of his life may have resulted in a different outcome.
- Projection augmented model
- Projection mapping
- Gang stalking
- Targeted individual
- Electronic harassment
- Mitsubishi 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
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