Chrono help for example file

Comments on CHRONO example probes_vectors.r3d

Plot 3d vectors for reaction forces, speeds, etc.

What to do: load the file, open the control panel, press the play button on the animation timeline (watch at least 5 seconds of simulation).

Note how the 'probe' objects can be used to plot trajectories in space, and how they can plot three-dimesional vectors to represent reaction forces in constraints (or speeds, or accelerations, etc).