Compon ents

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":

       "aCube.pnt[3]"

Component indexes start at 0, so the first point is:

       "aCube.pnt[0]"

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.

Examples:

Expression | What it indicates
    "Cone.pnt[3,6,8]"
| Points 3, 6 and 8 on an object named "Cone"
    "Cone.pnt[3-8,10]"
| Points 3 to 8 and 10
    "Cone.pnt[*]"
| All the points on the object (equivalent to Cone.point[0-LAST])
    "cube.poly[1]"
| The polygon
    "cube.edge[1-3,6,LAST]"
| Points 1 to 3, 6, and the last point

Here's some examples for a nurbs surface:

Expression | What it indicates
    "sphere.pnt[(2,4)]"
| Point (at u=2 and v=4)
    "sphere.pnt[(4,2),(4,6)]"
| Two points
    "sphere.isopnt[(0.621,0.682)]"
| An isopoint
    "sphere.knotcrvu[2,3]"
| A knot curve
    "sphere.isolineu[0.594]"
| An isoline
    "sphere.bndry[*]"
| A boundary
    "sphere.subsrf[0]"
| A subsurface
    "sphere.knot[(7,2)]"
| A knot

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