Abstract: The present invention provides methods for determining a collision between a first deformable object and a second deformable object in a virtual reality simulation, the method including the steps of providing a first test capable of determining the proximity of the first object to the second object, providing a second test capable of determining the proximity of the first object to the second object, wherein the second test is more comprehensive than the first test, and wherein the second test is capable of being implemented once the first test returns a positive result. Since the more comprehensive test is implemented only when a collision is likely or imminent (as determined by the first test), the processor executing the simulation is not unduly burdened, and can devote resources to other tasks required by the simulation program.