The Reactor dynamics system has been retired and REMOVED from 3ds Max 2012.
The reactorInterface provided access to the Reactor utility parameters and controls between 3ds Max 6 and 3ds Max 2011:
The following additional Interfaces and ReferenceTarget objects were exposed by Reactor:
Collision_Info : ReferenceTarget
The following Reactor Helpers were creatable and accessible through MAXScript:
The following Reactor Spacewarps were creatable and accessible through MAXScript:
WaterSpaceWarp : SpacewarpObject
The following Reactor Modifiers were creatable and accessible through MAXScript: