2009

Breakable group
Breakable When on, the constraint is breakable. If its breakable limits are
exceeded during simulation, it ceases to exert impulses on the attached objects.
You can find out more about breakable constraints in
Breakable Constraints
on page 3944.
Display group
Size Lets you change the size of the constraint space display in the viewport.
Reset Default Values Returns the constraint's parameters to their default
values.
Car-Wheel Constraint
Create panel > Helpers > reactor > Carwheel
Animation menu > reactor > Create Object > Car-Wheel Constraint
reactor toolbar > Create Car-Wheel Constraint button
You can use this constraint to attach a wheel to another object; for instance,
a car chassis. You can also constrain a wheel to a position in world space.
During the simulation, the wheel object is free to rotate around a spin axis
defined in each object's space. Linear motion is allowed for the wheel along
a suspension axis. You can also add limits to the wheel's movement along this
axis. The constraint's child body always acts as the wheel, while the parent
acts as the chassis.
The Car-Wheel constraint also has spin parameters. If these are nonzero, the
constraint turns the wheel during the simulation. You can specify a target
velocity and a target gain: the maximum angular impulse that the motor can
apply to the rigid body in order to achieve the target velocity.
A Car-Wheel constraint is simulated if it has the correct number of rigid bodies
attached and is included in a valid
Constraint Solver on page 3945. When not
selected, an invalid Car-Wheel constraint is red in the viewport.
3988 | Chapter 16 reactor