Abstract: This paper presents a method for generating compact and effective constructive-solid-geometry (CSG) object representations from 2D bitmap representations. The method consists of two parts: a stochastic search procedure for finding candidate CSG trees and a local optimization procedure that modifies the primitives of a given CSG tree to effect a better match. Results for several sample input bitmaps are presented and an application of this method to automatic geometric morphing between pairs of bitmaps is shown.