Curves

Primitives that are created with a cross section definition consist of one or more curves. The first curve defines the boundary (contour) of the primitive, and the additional curves define holes. The picture below shows four curves; the first one is the rectangle-shaped boundary and the other three are holes.

Curves consists of line segments which can be straight lines, arcs, or Bézier curves. A straight line segment can be split into smaller segments by adding a new control point to the line. A straight line can also be transformed into an arc or Bézier. An arc can be defined either with a center point and segment angle or with three points (end points and point along the arc). Creating a Bézier adds two new control points to the curve.

Curves cannot intersect each other.

Starting to create a new section prompts you to select the method to use for defining the shape of the section.