Silicon Graphics, Inc. (SGI) was a manufacturer of high-performance computer workstations, servers, and graphics hardware, founded in 1982 by Jim Clark together with a group of his Stanford graduate students. The company commercialized Clark’s Geometry Engine, a special-purpose VLSI processor for performing the matrix transformations, clipping, and coordinate mapping at the heart of 3D graphics. By building this geometry pipeline into hardware, SGI workstations could render interactive 3D scenes far faster than general-purpose computers of the era.
SGI’s machines exposed their graphics subsystems through a proprietary API called the IRIS Graphics Library (IRIS GL). As IRIS GL grew, SGI reworked it into a cleaner, vendor-neutral form and released it in 1992 as OpenGL, which it licensed cheaply to competitors and placed under an industry consortium, the OpenGL Architecture Review Board. SGI remained a voting member of the ARB through its life; when the ARB transferred control of OpenGL to the Khronos Group in 2006, SGI was among the listed member companies. OpenGL became one of SGI’s most enduring legacies, outliving the company itself.
Through the late 1980s and 1990s SGI was the dominant supplier of professional 3D graphics, and its workstations and Onyx graphics supercomputers became fixtures of film and television visual effects. Industrial Light and Magic used SGI systems to create the computer-generated dinosaurs in Jurassic Park (1993), and the IRIX SGI environment even appeared on screen in the film. SGI hardware was widely used in computer-animated and effects-heavy productions through the 1990s, and the company’s systems were central to the early years of high-end digital film rendering.
In its oral history collected by the Computer History Museum, Jim Clark recounts founding SGI in 1982, building the company into the leading computer graphics firm in the world, and ultimately leaving in 1994 after disagreeing with management about whether SGI should pursue lower-end products to defend against commodity PCs. His departure preceded the rise of inexpensive PC 3D accelerators that would eventually erode SGI’s market.
As consumer GPUs from companies like NVIDIA brought hardware 3D to ordinary PCs at a fraction of SGI’s prices, the economics that had sustained SGI’s premium workstation business collapsed. The company declined through the 2000s and its original incarnation went bankrupt, with its assets and brand passing through later owners. Even so, SGI’s technical contributions, especially the Geometry Engine concept and the OpenGL API, shaped the trajectory of real-time computer graphics.