B-spline Surface

B-spline is a mesh in which the control points affect only their local region of the surface.

Creating:

1. select B-spline from the create surfaces menu.
   
   
2. Click in any viewport and drag to define the meshes length and width.
   
   
3. Release when the desired size has been achieved. To deform the mesh select Move from the top menu bar and click on the control point on the portion of the mesh that you want to deform.Left click and drag to move the control point horizontally, and right click and drag to move the control point vertically positive or negative.