Surfaces are one of the basic types of renderable geometry in Softimage. They are cubic or linear NURBS patches. You can:
• Build surfaces from other objects in your scene.
• Modify the topology of surfaces in a variety of ways.
• Project curves onto surfaces and use the projected curves to trim surfaces.
Surfaces also form the basis for building seamless assembled surface meshes, which are described in Surface Meshes.
Autodesk Softimage v.7.5