Audrey St. John

Geometric constraint systems

A geometric constraint system is composed of atomic elements with geometric constraints among them. Constraints may be pairwise or k-ary.


 Atomic elementsConstraints
Bar-and-jointUniversal jointsFixed-length bars between pairs of joints
Body-and-barRigid bodiesFixed-length bars between pairs of bodies; bars are rigidly attached to bodies by universal joints
Body-and-hingeRigid bodiesFixed-length hinge joints between pairs of bodies; hinges impose both a distance and angle constraint, allowing one degree of freedom (rotation around the hinge axis)

Under construction -- more definitions and examples coming soon!