What are TSplines? 
"TSplines are the next thing... They have opened up possibilities to work with surfaces that were simply impossible before." — Eric Allen, Production Manager, DAZ TSplines: A new modeling surface for designTSplines are a powerful computeraided design (CAD) surface with special properties, which improves upon traditional CAD technology while retaining compatibility. TSplines allows designers to
Since TSplines is compatible with existing modeling technologies, it integrates easily with most production pipelines. Add detail only where necessaryTSplines surfaces can contain areas with differing levels of detail. Control points may be added only where needed. A typical TSplines surface will have up to 50% fewer control points than the identical equivalent set of NURBS surfaces. TSplines are similar to NURBS, with the difference that you can have partial isoparms. A main difference between TSplines and NURBS is the existence of Tpoints. A Tpoint is a vertex where on one side, there is an isoparm, and on the other side, there isn't. This allows lines of detail to end elegantly. The surface is always smooth (C2) at a Tpoint. NURBS don't allow Tpoints. Create nonrectangular topologyExtrusions, holes, and other unique features are easy to create in a TSpline surface. This is a second difference between TSplines and NURBS. NURBS require multiple surfaces, or a polysurface, for such objects. TSplines can accomodate these features in a single surface, through using a special point called a star point. TSplines are like subdivision surfaces in this respect, with the difference that you can insert geometry without changing the surface. Easily edit complex freeform models.Because of Tpoints and star points, TSplines surfaces are easy to editsimply grab a point anywhere on the surface and move it. The surface will stay smooth and gaps will not be introduced. Maintain NURBS compatibilityIf your downstream applications require a different file format, TSpline models can be exactly converted to NURBS. TSplines can also be exported as a mesh.
