Item

Description

Assembly

A scene node that contains components. It defines the hierarchy of the product structure.

Component

Part or Assembly

Decimation

Reduces the polygon density of a mesh by deleting vertices.

Instance

Scene node used to instantiate a Component

Occurrence

As Parts and Assemblies can be instantiated, an Occurrence is the instantiated occurrence of a Component. For example, if a wheel part is instantiated 4 times, there will be 1 Part but 4 Occurrences of the wheel.

Patch

CAD face or surface limited by spline curves

Patch boundary

A non-discontinuous patch border or edge

Part

Scene node representing a single object

Tessellation

In surface modeling and solid modeling, Tessellation is the method used to represent 3D objects as a collection of triangles or other polygons. All surfaces, both curved and straight, are turned into triangles either at the time they are first created or in real time when they are rendered. The more triangles used to represent a surface, the more realistic the rendering, but the more computation is required

See Meshes VS Nurbs for more information.