ACIS

The 3D ACIS® Modeler (ACIS) is a 3D modelling kernel (or engine) owned by  Spatial Corporation (formerly Spatial Technology). ACIS is used by many software developers industries such as computer-aided design, (CAD), Computer-aided manufacturing (CAM), Computer-aided engineering (CAE), Architecture, engineering and construction (AEC), Coordinate-measuring machine (CMM), 3D animation, and shipbuilding. ACIS provides software developers and manufacturers the underlying 3D modeling functionality.
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For other meanings, see ACIS (disambiguation) In Ovid's Metamorphoses (xiii.750-68) Acis was the spirit of the Acis River, which flowed past Akion (Acium) near Mount Etna in Sicily. According to Ovid's poem, Acis was the son of Faunus and the river-nymph Symaethis, daughter of the River Symaethus. Acis loved the sea-nymph Galatea, but a jealous suitor, the Cyclops Polyphemus, killed him with a boulder. Galatea then turned his blood into the river Acis.
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n. opening

[Greek] A Sicilian shepherd youth, occasionally regarded as a son of Dionysus. He was in love with Galatea but rival, the Cyclops Polyphemus, killed him with a boulder. Galatea turned his blood into the river of the same name. (Ovid Metamorphoses XIII, 750-68)

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A geometric engine that most CAD packages now use. ACIS uses a sophisticated object-oriented approach for modelling, the data is stored in boundary representation. Acis is owned by Spatial Technologies.
[How does this differ from "solid modelling"?].
(1996-03-21)

"opening; inauguration"