- Download a free trial of T-Splines for Rhino. 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. Difficulty: Intermediate Commands used: Delete • tsAppend • tsConvert • tsExtrude • tsInsertPoint • tsManip • tsMatch • tsMerge • tsSelection • tsSymmetry