AutoSimp is a surface simplification program which can be applied to all kinds of AutoCAD surfaces : 3D faces, polygon meshes and polyface meshes. It allows high decimation rates within short processing times. Three simplification methods are available in this program. They are all based on space partitioning and vertex merging. First, the vertices are clustered into cells. Then, in each cell, vertices are merged into their center of gravity. Finally, null-area polygons are eliminated. The three methods use different subdivision methods which require numeric parameters of various types. All the simplification options are given in a simplification dialog box.