History
As a geometric kernel, ACIS is a second generation system, coming after the first generation Romulus
There are several versions about what the word ACIS actually stands for, or whether it is an acronym at all. The most popular version is that ACIS stands for Alan, Charles, Ian's System (Alan Grayer, Charles Lang and Ian Braid as part of Three-Space Ltd.), or Alan, Charles, Ian and Spatial (as the system was later on sold to Spatial Technology, now Spatial Corp). However, when asked, the creators of ACIS would simply suggest that its name was derived from Greek mythology (See also Acis).
In 1985 Charles Lang and Ian Braid (creators of Romulus and Romulus-D) formed Three-Space Ltd. (Cambridge, England) which had been retained by Dick Sowar's Spatial Technology (which had been founded by Sowar in 1986) to develop the ACIS solid modeling kernel for Spatial Technology's Strata CAM software. The first version of ACIS was released in 1989 and was quickly licensed by HP for integration into its ME CAD software.
In late 2000, around the time when Spatial was acquired by Dassault Systemes, the ACIS file format changed slightly and was no longer openly published.
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