Mona A.

AutoCAD was derived from a 1977 program called Interact CAD, which was written in a proprietary language (SPL) by inventor Michael Riddle who later co-founded Autodesk to market AutoCAD.[4] This early version ran on the Marinchip Systems 9900 computer (Marinchip Systems was owned by Autodesk co-founders John Walker and Dan Drake). While initially Walker and Riddle had a profits-sharing agreement for any product derived from Interact, in the end Walker paid Riddle US$10 million for all the rights. When Marinchip Software Partners (later known as Autodesk) formed, the founders decided to re-code Interact in C and PL/1. They chose C because it seemed to be the biggest upcoming language.[citation needed] In the end, the PL/1 version was unsuccessful. The C version was, at the time, one of the most complex programs in that language. Autodesk had to work with a compiler developer, Lattice, to update C, enabling AutoCAD to run.[5] Early releases of AutoCAD used primitive entities -- lines, polylines, circles, arcs, and text -- to construct more complex objects. Since the mid-1990s, AutoCAD supported custom objects through its C++ Application Programming Interface (API). The modern AutoCAD includes a full set of basic solid modeling and 3D tools. The release of AutoCAD 2007 included the improved 3D modeling that provided better navigation when working in 3D. Moreover, it became easier to edit 3D models. The mental ray engine was included in rendering and therefore it is possible to do quality renderings. AutoCAD 2010 introduced parametric functionality and mesh modeling. The latest AutoCAD releases are AutoCAD 2014 and AutoCAD 2013 for Mac. The 2014 release marked the 28th major release for the AutoCAD for Windows. The 2013 release marked the third consecutive year for AutoCAD for Mac.[6]