A computer apparatus and method for generating structures and analyzing the stability of a structure formed from multiple predefined components represents the structure as a series of bodies fixed in place by stationary joints. The joints have known properties and each joint is assigned a torque capacity corresponding to the known properties. A computer routine calculates torque exerted on each joint and compares the calculated torque with the torque capacities to determine stability of the structure. The computer routine enables remodeling of an unstable structure.