2009

Do Not Simulate Friction When on, reactor ignores all Friction values during
the simulation, and objects slide easily across each other.
Fracture Penetrations These parameters let you adjust how reactor simulates
Fracture objects. For details, see
World rollout > Fracture Penetrations group
on page 4017.
Simulation group
These controls are available only with the Havok 3 engine.
The first lets you choose how reactor computes the simulation:
■ Discrete reactor checks for collisions only at the beginning and end of
each simulation step. This is faster but less accurate.
■ Continuous reactor checks for collisions constantly, throughout each
step. This is the default choice, and results in slower but highly accurate
simulations. This option significantly reduces the chances of missed
collisions.
Max Linear Vel. The assumed maximum linear velocity for all bodies.
This does not set objects' linear velocity. If, later on, a rigid body's velocity
significantly exceeds this value, it might tunnel through other objects even
if its Quality property is set to Critical.
The default value is 200 meters/second. This value is used during continuous
simulations by the collision solver to optimize the simulation, so if it can
assume a maximum linear velocity it can discard several cases and get a
solution faster.
Stiffness The hardness of the constraints in the scene.
Use this parameter to configure the dynamics solver. When constraints used
in the scene are very hard or stiff, set this to Hard; the Soft or Medium setting
works most other cases. Setting Stiffness to Soft can lead to unstable solutions
if the constraints are too stiff.
TIP Another way to reduce the stiffness of the simulation is by lowering the
Strength value of constraints, thus relaxing the constraints.
Collisions Rollout
Utility panel > reactor > Collisions rollout
4090 | Chapter 16 reactor