Vector General

Vector General. The Vector General was a pioneering line of interactive computer graphics display systems developed in the 1970s. It was a commercial evolution of the earlier Evans & Sutherland LDS-1 and became a critical tool in computer-aided design, molecular modeling, and flight simulation. Renowned for its high performance and precision, it helped establish the vector graphics terminal as a cornerstone of professional visualization before the widespread adoption of raster graphics.

History

The origins of the Vector General trace directly to work at Evans & Sutherland, a company founded by Ivan Sutherland and David C. Evans. Following the development of the LDS-1, key personnel including Tom Stockham and Gary Demos left to form their own venture, initially called Information International, Inc. (Triple-I). The team, which later included John G. Kollock, refined the LDS-1 design into a more robust and commercially viable product. The first system, the Vector General 3D Display System, was introduced in 1974. The company, Vector General Inc., was subsequently acquired by MegaScan Technology before its technology and influence were ultimately reabsorbed into the evolving product lines of Evans & Sutherland.

Technical specifications

The system was built around a high-precision, digital differential analyzer (DDA) based vector generator that drove a cathode-ray tube with a persistent phosphor coating. This allowed for the display of crisp, flicker-free line drawings. Key components included a dedicated display processor with its own magnetic core memory for storing display lists, offloading the graphics workload from the host minicomputer. It featured a unique three-axis joystick and a data tablet for intuitive three-dimensional interaction. The system connected to hosts like the DEC PDP-11 or Data General Nova via a direct memory access interface, supporting real-time manipulation of complex wireframe models.

Applications and impact

Vector General systems found immediate and significant application in demanding scientific and engineering fields. They were instrumental in early computer-aided design and computer-aided manufacturing software, used by corporations like General Motors and Boeing. In scientific research, they were vital for molecular graphics, enabling researchers at institutions like the University of North Carolina at Chapel Hill to visualize and manipulate protein and DNA structures. The NASA Ames Research Center utilized them for computational fluid dynamics visualization, while the United States Air Force and companies like McDonnell Douglas integrated them into flight simulator training systems. Their performance made them a preferred display for pioneering animation systems, including those at the New York Institute of Technology.

Models and variants

The primary product line began with the Vector General 3D Display System (often called the VG-3D). This was followed by the enhanced VG 3400 series, which offered improved performance and reliability. A significant variant was the VG 8000, a lower-cost, two-dimensional system aimed at the computer-aided drafting market. Later models incorporated support for color CRT monitors using a shadow mask technique, and some systems were packaged with specialized application software for particular markets like electronic design automation. The systems were often sold integrated with turnkey software solutions from vendors like Applicon and Auto-trol Technology.

Legacy and preservation

The Vector General's legacy is its role in proving the practical utility of interactive three-dimensional computer graphics in professional environments. It directly influenced subsequent generations of graphics hardware, including the Evans & Sutherland PS-300 and the Silicon Graphics Geometry Engine. While ultimately superseded by cheaper, raster display-based workstations from companies like Sun Microsystems and Silicon Graphics, its design principles endured. Several original systems are preserved in museum collections, such as those at the Computer History Museum in Mountain View, California and the National Museum of American History. The company's pioneering work on real-time display processors contributed to the evolution of the modern graphics processing unit.

Category:Computer graphics hardware Category:American inventions Category:History of computing hardware