Creating Curves Using Control Points

Creating 3D Curves on a Cloud of Points

You can create a 3D curve using clouds of points or polygons as the support. The curve may not lie on the cloud or polygons but its construction points should be constrained onto them: the handle is always tangent to the cloud or polygon and always lies on it.

Before you begin: Open an existing 3D shape consisting of cloud of points.
  1. Choose the curve creation type.
    • Through points: The resulting curve is a multi-arc curve passing through each selected point.
    • Control points: The selected points are the control points of the resulting curve.
    • Near points: The resulting curve is a single-arc, with a set degree and smoothed through the selected points.
  2. Select the points on the cloud.

    • If the cloud is not tessellated, the points of the resulting curve are constrained on both cloud and points of cloud. Therefore, you must snap from point to point on the cloud.
    • If the cloud is tessellated, the points of the resulting curve are constrained on the cloud but not on the points of the cloud. Therefore, you can select a point anywhere on the cloud.

  3. Click OK to create the curve.

 

See Also
More help on this topic