Watch this video to see how to create smooth transitions and blends using T-Splines. The video also shows how to use Rhino's Blend command to blend a T-spline surface to a NURBS surface.

T-Splines for Rhino is useful for modeling soft, freform objects in 3D, such as cushioned furniture. Here are two videos showing how to model a couch using T-Splines. First, a two-minute, time-compressed marketing piece. Second, a detailed 19-minute annotated tutorial.