Subdivision surfaces allow you to create a high-resolution polygon mesh object from a low-resolution one and use the low-resolution mesh to control the high-resolution one. You can:
• Use one of several subdivision algorithms.
• Subdivide polygons in one of three ways:
- Generate a new object based on an existing polygon mesh.
- Apply a geometry approximation property to an existing polygon mesh.
- Apply subdivision locally to selected polygons.
• Modify the hardness of edges and points to create creases and spikes.

Autodesk Softimage v.7.5