3d modelling software is used by the entertainment, architecture and product design industries to create 3d mathematical representations of 3d objects in an intuative manner. Applications typically make use of either polygons, cubic surfaces (e.g. bezier, NURBS) or other forms such as metaballs. computer games typically use the polygonal form.
Example programs include 3d studio max, lightwave, maya, softimage, mindformer, clayworks, ac3d and many more.