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Repeat the above steps with the Rotation track.

To set up dynamics:

1 Assign materials to the objects included in the simulation and adjust the

surface characteristics in the Dynamics Properties rollout of the Material

Editor. (For a bouncing ball, you'd use this to create a rubber-like surface.)

2 If you're using a linked hierarchy, set the Move and Rotate locks in the

Hierarchy/Link Info panel to limit the motion and rotation of the linked

objects.

3 Create space warp effects in the scene where needed. (For a bouncing

ball, you'd need a Gravity space warp.)

4 Use the Dynamics utility to create a new simulation. Specify which objects

are included in the simulation, which effects influence which objects,

and which objects should collide with which. (For the bouncing ball, the

ball and the floor are in the simulation because one collides with the

other. You assign the ball the floor to collide with each other, and assign

the gravity effect to the ball.)

5 Use the Dynamics utility to specify the range of frames to which keys

will be generated, and to calculate the animation and generate the keys.

(In the case of a bouncing ball, a number of position and rotation keys

are generated for the ball.)

6 Play the animation to see if the effect is what you were looking for. If

one or more objects fly off into space, or move through objects they

should have bounced off, it's likely that you need to increase the Calc

Intervals Per Frame value.

To reduce the number of keys generated by the Dynamics utility:

When you solve a dynamics simulation, Position and Rotation keys are

generated at every frame of the specified range for every object affected in the

simulation. Not only does this result in an excess of keys for later editing, but

it can increase the size of the .max file tremendously. The following steps show

how to reduce the number of keys using Track View.

1 After solving the simulation, check the animation to make sure it's what

you want, and then save that version of the scene.

2 Deselect every object in the scene.

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