Translations:Glossary/12/en

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OCC
Acronym for Open CASCADE. Prior to being open sourced, it used to be named CAS.CADE (abbreviated from Computer Aided Software for Computer Aided Design and Engineering).
OCE
Open CASCADE Community Edition. It provides patches, improvements and experiments contributed by users over the official Open CASCADE library. FreeCAD is known to work on either OCC or OCE.
OCCT
Open CASCADE Technology. See OCC.
Open CASCADE
The geometric modeling kernel (software library) underlying FreeCAD. Also called OCC or OCCT (for Open CASCADE Technology). See also OCE.
OpenSCAD
1.  Name of a script-only based CAD program.
2.  A workbench in FreeCAD. The OpenSCAD workbench provides an interface for import/export of *.scad and *.csg models, as well as a some utility tools.
Origin
The center of the coordinate system. Everything goes out from here in either the positive or negative directions. As is our view of the universe with Earth being the “origin”.
Orthographic
See Orthographic projection and Multiview orthographic projection.