Gismo: An Object oriented program for high-energy physics event simulation and reconstruction

Gismo is a highly interactive program, with an iconic human interface and a 3D graphics display, which was developed in order to investigate the feasibility of using object-oriented programming within high-energy physics. It allows the user to design a detector and save it to disk, to track Monte Carlo events through such a detector, to simulate the detector response, and to reconstruct an event from this response. Gismo was developed using Objective-C and the Interface Builder on a NeXT computer, and the speed with which it was possible to build an application of this complexity indicates that the techniques used warrant further investigation.