The 3D ACIS® Modeler (ACIS) is Spatial’s prominent 3D solid modeling engine. 3D InterOp is a CAD data translation framework (Interoperability)
Rendering Base
From DocR20
The Rendering Base Component (RBASE), provides a common interface from ACIS to all renderers, and is required if either interactive or batch rendering is to be performed on an ACIS model. It facilitates swapping out renderers for the requirements of different platforms. Because RBASE must support all renderers, its set of API functions may contain functionality not supported in some renderers.
