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
|
