2009

Your objects are now all child objects of a new group parent. You can
add this parent object to a Rigid Body Collection.
To edit compound rigid body properties:
1 With the compound rigid body selected, choose Group > Open.
2 To edit the compound rigid bodys properties, select the parent (dummy)
and go to the properties rollout of the utility or open the Rigid Body
Properties dialog. You cannot edit the Mass or Simulation Geometry
values for a group parent because they are primitive properties.
TIP It's easier to select a group parent using the Select Objects dialog on
page 232 with Display Subtree enabled: The group parent is displayed above
its members.
3 To edit one of the rigid bodys primitives properties, select the appropriate
child and go to the Properties rollout of the utility or open the Rigid Body
Properties dialog. You can give this object a Mass value and, if you wish,
change its Simulation Geometry setting. Specifying any other rigid body
properties for a child object has no effect unless you remove the object
from the group.
Rigid Body Collection
Create panel > Helpers > reactor > RBCollection
Animation menu > reactor > Create Object > Rigid Body Collection
reactor toolbar > create Rigid Body Collection button
The Rigid Body Collection is a reactor helper object that acts as a container
for rigid bodies. Once you have added a Rigid Body Collection to your scene,
you can add any valid rigid bodies in the scene to the collection. You can find
out more about rigid bodies in the
Rigid Body Basics on page 3910 section.
When you run the simulation, reactor examines the Rigid Body Collections
in the scene and, provided the collections are not disabled, adds the rigid
bodies they contain to the simulation.
At a lower level, a collection also allows you to choose the mathematical
method to be used for solving the rigid body behaviors for its member bodies.
3922 | Chapter 16 reactor