Reactor (software)

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Reactor is a physics engine from the Irish software company Havok for use in Autodesk 3ds Max.


Reactor shipped fully integrated with 3ds max from versions 5 to 2011. In 3ds max 2012, Reactor was replaced by a PhysX-based engine called MassFX.[1] Reactor was often used for realistic physics simulation that would be difficult or time-consuming to animate by hand.

Dynamics types[edit]

Reactor is capable of computing rigid body, soft body, cloth and rope collisions, and even all four types interacting with each other. A robust physics engine, reactor can handle several hundred rigid bodies interacting with each other without a problem on most computers. Reactor can also simulate dynamics of any supported type interacting with a water volume, including adjustable viscosity and depth, among other things.

Forces and constraints[edit]

Reactor includes a large number of forces that can be used in simulation, apart from the default gravity: springs, dashpots, motors, wind, fractures (breakable objects), even a "toy car" type, with definable body/axis/wheels. Reactor also has many constraints available, including hinges, point-to-point constraints, prismatic constraints, car-wheel constraints, point-to-path constraints, and even ragdoll constraints to realistically simulate a lifeless body. In addition, reactor is compatible with Space Warp modifiers in 3ds max.


  1. ^ "3ds Max 2012 released: new MassFX system overview". 2011-04-08. Retrieved 2011-06-08.