Create a free form curve by placing points.
Sculpt
Sketch
Curves
Spline
Detailing
Sketch
Curves
Spline
The spline solver creates a curve that goes through each point with smooth transitions. You can create open or closed splines.
Spline. To create a spline that is tangent to another line, arc, or spline, click an endpoint of the line or spline, and drag away from it. When the tangent line indicator displays, release the mouse.
Click the start point of the spline to create a closed spline.