2009

The ground will "move" during the simulation.
19 Click Solve.
The keyframed "ground" box moves up and collides with the boxes. The
ability of a keyframed object to be part of a simulation is one of the useful
features in 3ds Max. You could use this capability to strike a ball with a
bat, for example.
For further experimentation, create a spring object in Create panel >
Geometry > Dynamics Objects and attach the ends of the spring object
to two of the boxes and then solve the simulation. The spring will stretch
and follow the bouncing boxes.
You can use the space warps in Create panel > Space Warps > Dynamics
Interface, such as SDynaFlect (Spherical Dynamics Deflector) to cause a particle
stream to "push" an object in a dynamics simulation.
To remove the dynamics tracks and restore the original animation tracks in
Track View:
When you solve a dynamics simulation, 3ds Max creates a list controller that
holds both the generated dynamics keys and the original keys. This lets you
easily restore the original keys. Undo is not supported by Dynamics.
To layer simulations, reverse this method. In other words, after you've solved
the first simulation, copy its controllers to the old tracks, and then set up the
next level of the simulation. The new simulation will base its actions on the
previous one instead of overwriting it, as it normally does. You can repeat this
as many times as you like to layer simulations ad infinitum.
Since Undo is not supported by Dynamics, you can also use Hold and Fetch
in its place.
1 In Track View, open the Position track for an object animated by a
dynamics simulation.
2 Select the Old Position track, and click Copy Controller on the Track
View toolbar (the second button from the left).
3 Select the Position track (the parent), and click Paste Controller (to the
right of Copy Controller).
4 Click OK in the Paste dialog.
The two sub-tracks and the Position parent track are replaced by a single
Position track containing the original keys that were in the Old Position
track.
3856 | Chapter 15 Animation