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An
entity is the most basic
ACIS object. It is implemented in the
C++ class
ENTITY. All entities have a common set of functionality, such as the ability to save and restore themselves to and from a file, copy themselves, and debug themselves. All other geometric and higher level
ACIS model objects are derived from the
ENTITY class.
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A model object is any object that can be saved to and restored from a save file (.sat or
.sab).
ACIS model objects are implemented in
C++ using a hierarchy of classes that are derived from the
ENTITY class.
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This chapter describes the
ENTITY class and how the model geometry classes, model topology classes, and attribute classes (all derived from class
ENTITY) are integrated together to form a model. For information about specific classes, refer to the reference templates in online help.
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