Components are the parts of a geometric object such as points, edges, and polygons.
Individual components are referenced using an number called an index. For example, the following expression refers to the point at index number 3 on the cube "aCube":
Component indexes start at 0, so the first point is:
For this reason, it is easier to think of aCube.pnt[3] as point number 3 instead of as the fourth point.
Geometric components such as points are indexed from 0 to LAST.
Here's some examples for a nurbs surface:
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