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748 Chapter 13: reactor

To create a Hinge and attach objects in a single step:

•SeetheScripts (page 2–817) topic.

To change the Hinge positions and rotations for the

bodies:

With the Hinge helper object selected, open the

Modify panel.

2. In the modifier stack open the sub-object list

for the Hinge.

3. A ccess the sub-object level corresponding to

theobjectwhosehingeaxesyouwanttomove:

Child Space or Parent Space. If the Hinge is

single-bodied, Parent Space represents the

world attachment position and rotation of the

axes.

4. The space, represented by a p air of axes, the

larger of which represents the hinge axis, the

smaller of which is used to specif y limits,

becomes active in the viewport. It can be moved

and rotated using the Move and Rotate tool

respectively. The space maintains its position

and rotation relative to its corresponding

object. For example, if you move or rotate the

childbody,theChildSpacemoveswithit.

5. To reset the axes to their default alignment,

reattach the objects to the Hinge or click the

Align Spaces To > Child Body button.

To limit the rotation between the a ttached objects:

With the Hinge selected, open the Properties

rollout.

2. Turn on the Limited check box.

The Hinge limits display around the Parent

Space axis.

The default angle limits are –90.0 and 90.0. This

means t hat i n a situation where the sub-objects

are fully aligned for the objects, the objects will

be able to rotate 90 degrees in either direction

about the shared hinge axis.

The child object is free to rotate within the

indicated limits relative to the parent during the

simulation.

3. Change the minimum and maximum rotations

the constraint maintains between t he objects by

adjusting the Min Angle and Max Angle va lues.

The limit display updates to reflect your

changes, to help you cho ose appropriate values.

Upon simulation you can see that the rotation

between the objects has been limited.

Interfa ce

Modifier Stack

Parent S p a ce—At t his sub-object level, you can

move and rotate the representation of the Hinge for