TYPE: Object State
TITLE: Rigid Body Dynamics Operation

The Rigid Body Dynamics (RBD)operation is used to aid in setting up a POP
network to create a RBD simulation.

To start this operation, select the geometry objects that you wish to have
included in the RBD simulation, and right-click to complete the operation.
Once you have chosen the objects that will be in the simulation, this
operation gives you several ways to modify the simulation.

The ctrl-right-mouse menu lets you create a force, a fan, or a nail, point, or
rotation constraint.  Each of these menu items create a Force object and a POP
that corresponds to the menu item you chose.  The parameters of the Force
object are also set to create the desired type of force.

The operation controls bar above the viewport allows you to turn on Grouping
mode.  When in this mode, it is easiest to have Secure Selection turned off.
However, you can always accomplish the same tasks by having Secure Selection
turned on and right-clicking after performing each selection.  This mode
allows you to pick which objects in the simulation are affected by which
Force objects.  You begin by selecting the Force object that you wish to do
grouping for.  Then you select the object or objects that you want that
Force to apply to.

The Point constraint force acts on two sets of objects, constraining each
object in the first group to the corresponding object in the second group.
To do this in the viewport using Grouping mode, first you select the point
constraint object, and then select the objects for the first group.  Then
turn on the Group B parameter in the operation controls bar.  Then select
the point constraint object again, and then select the objects for the
second group of the point constraint.
