Dynamics Help

This panel has controls for setting various forces that affect the dynamical 
behaviour of the knot when the "go" button is clicked.  Use the check boxes to
enable or disable a force.

     elec --- a repulsive force that acts between pairs of beads.  use the 
              charge slider to change the magnitude of the force.  this force
              is generally not a 1/r^2 force, but falls off as 1/r^power

     mech --- an attractive force that acts between neighbouring beads on a
              strand.  this force is non-linear (use amech to get a linear 
              force).  the value of the hooke slider is used to scale the force

     amech --- `alternative mech', this is similar to the mech force.   edges 
                in the knot act like springs with rest length `spring'.  
                set `afmpower' to 1 to get a linear spring.

     symm --- an approximation to Greg Buck's symmetric energy force

     velfo --- a force proportional to velocity

     grav --- gravity

     therm --- random agitation

     tanf --- force acting along the tangent direction of the knot.  has an 
              implementation bug that makes for interesting demos

Click on the `go' button to start/stop dynamics. 

     Undamped / Damped --- `Undamped' is closest to Newton's law F = ma,
                           with `Damped', beads do not retain any inertia
                           
     A / B --- just a convenience feature that sets multiple things simultaneously
     
     Init --- resets dynamics to initial setting,  zero --- zeros out velocities

Slower graphics cards can benefit from increasing the value of `dstep' (display
step).  A redraw of the knot occurs every dstep dynamical steps.

Set `stusplit' to a positive value to enable auto-splitting of stuck cylinders. 
This is useful in conjunction with the `dbeads' button which attempts to delete
beads.  Try the Split/delete demo on DemoA to see how these two can be used to
quickly simplify knots. 
