The 3D ACIS Modeler (ACIS) is a geometric modeling kernel developed by Spatial Corporation (formerly Spatial Technology), part of Dassault Systemes. ACIS is used by many software developers in 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.

The story of the love of Acis and the sea-nymph Galatea appears in Ovid's Metamorphoses. There the jealous Cyclops Polyphemus, who also loves Galatea, comes upon them embracing and crushes his rival with a boulder. His destructive passion comes to nothing when Galatea changes Acis into a river spirit as immortal as herself. The episode was made the subject of poems, operas, paintings and statues in the Renaissance and after.