2009

Procedures
To create a Car-Wheel constraint:
■ Choose one of the above options, and then click in any viewport to add
the Car-Wheel constraint.
NOTE The icon’s position has no effect on the constraint’s behavior.
To attach objects to the Car-Wheel constraint:
1 Create the constraint and the objects to connect using it.
2 On the constraint’s Properties rollout, click the Child pick button, and
then, in one of the viewports, select the object you want to use as the
wheel.
This attaches the constraint to the wheel at the wheel's pivot point. The
spin axis is aligned to the X axis of the wheel object and the suspension
axis is aligned to the Z axis.
3 If you do not want to assign a chassis to the Car-Wheel constraint, turn
off the Parent check box if necessary.
4 If the Car-Wheel constraint is to be two-bodied, repeat step 2, using the
Parent pick button to specify the chassis object for the constraint.
To create the constraint and attach objects in a single step:
■ See the
Scripts on page 4103 topic.
To change the positions and rotations for the bodies:
1 With the constraint selected, open the Modify panel.
2 In the modifier stack open the constraint’s sub-object list.
3 Access the sub-object level corresponding to the object whose constraint
space you want to move: Parent Space for the chassis or Child Space for
the wheel. If the constraint is single-bodied, Parent Space represents the
world attachment position and rotation of the constraint axes.
4 The space, represented by just a spin axis for the wheel and by the spin
and suspension axes for the chassis, becomes active in the viewport and
can be moved or rotated using the Move or Rotate tool, respectively. The
space maintains its position and rotation relative to its corresponding
Constraints | 3989