To create a dependent surface-curve point:
The NURBS object must have a curve that passes through a surface.
The point is created at the intersection between the curve and the surface that is nearest the seed point. You can use the surface-curve parameters to trim the parent curve.
While a surface-curve intersection point sub-object is selected, a rollout with its parameters appears.
When on, trims the curve from the surface. When off, the curve isn’t trimmed.
When on, trims the curve in the opposite direction.
Changes the U location of the seed value on the curve. If there is a choice of intersections, the intersection closest to the seed point is the one used to create the point.
(Only at modification time.) Let you replace the parent sub-objects. Click a button, then click a curve or surface to replace the original parent object.