Fahrenheit was or should have been project that would make uniqe multiplatform API, made by Microsoft, SGI and HP, with plan that would unite OpenGL and Direct3D. Orginal project is now totaly abandoned and Microsoft and SGI quit of trying to work together.

Before end of 1997. Microsoft and SGI agreed for delivery of their solution and their parts in project. SGI should deliver soulutions for Fahrenheit Scene Graph and solutions used in CAD applications for Fahrenheit Large Model, while Microsoft should deliver low-level solutions for Direct3D replacement. Project was presented at SIGGRAPH in 1998 and shoud be completed in 1-2 years period. Fahrenheit stopped to be primary in development in SGI because their mainframe computers MIPs were loosing on performanses because of global development of PCs. Until 1999 SGI realized that Microsoft doesn't attent to fulfil their part of deal. Without low-level solutions, Fahrenheit couldn't exist and their project stopped. SGI was found itself in worse position and couldn't watch how Microsoft is ruing their buissnes plans so SGI gave up part of ownership and gave it to Microsoft. Everything left of Fahrenheit is XSG which was Scene Graph and pubblished by Microsoft with note that it wouldn't be supported.