||This class is used as a builder to dynamically construct a
ParticleString2D following a given spline path, sampled at a fixed
||Utility builder/grouping/management class to connect a set of particles into
a physical string/thread.
||Implements a spring whose maximum relaxation distance at every time step can
be limited to achieve better (if physically incorrect) stability of the whole
||Implements a string which will only enforce its rest length if the current
distance is less than its rest length.
||An individual 3D particle for use by the VerletPhysics and VerletSpring
||3D particle physics engine using Verlet integration based on:
A spring class connecting two VerletParticles in space.