Downloading CAD software from these sources carries severe risks:

As the first version built specifically for Rhino 5 (64-bit), the plugin works seamlessly with the host application, ensuring that T-Spline objects are fully integrated into the Rhino modeling environment.

While the original tsplines.com domain is defunct, the following community and support pages provide the most relevant information:

T-Splines offers the best of both worlds. The core concept of T-Splines was introduced by T. W. Sederberg and his team as early as 2003. It bridges the gap between and Subdivision Surface (SubD) modeling by allowing a T-junction in its control mesh (the "T-Mesh"). This small change is a game-changer. Unlike NURBS, where a row of control points must run the entire length of a surface, T-Splines allows them to "terminate" in a T-shape.

If you are exploring new, modern alternatives with active support, you may want to look into or Autodesk Fusion 360 , which utilize similar modeling principles.

: This version was specifically optimized for the 64-bit architecture of Rhino 5. Download and Installation Status

Designers can insert control points only where needed.

T-Splines v.4.0.r11183 can be downloaded from the official website. A 30-day free trial is available, allowing users to test the software before purchasing a license.

The resulting quad-dominant OBJ or FBX meshes can be imported directly into Rhino 7 or 8 and converted into SubD or NURBS surfaces for manufacturing. Transitioning Legacy Files to Modern Formats

Practical benefits for users

No third-party plugins or separate licenses are required.