Page 1101 - Kitab3DsMax

Chapter 43: Simulating Physics-Based Motion with reactor
In the preceding example, you looked at something that reactor made much easier, but in this example, you
see some animations that would be impossible without reactor. Cloth deformation is very difficult to ani-
mate, but it is much easier if you correctly apply the laws of physics to describe this motion. In this simple
example, you throw a stiff shirt over a stationary chair to see how it reacts.
To animate cloth falling over a hard object, follow these steps:
1. Open the Shirt over chair.max file from the Chap 43 directory on the DVD.
Tutorial: Throwing a shirt over a chair
This file includes a chair object and a shirt that is nothing more than an extruded shape that has
been sufficiently subdivided.
2. Select Animation ➪ reactor ➪ Create Object ➪ Rigid Body Collection, and click in the Front view-
port to create the collection icon. Click the Add button, and select the chair and the floor objects
to add them both to the Rigid Body Collection.
3. Select the chair and floor object, and choose Animation ➪ reactor ➪ Open Property Editor. Select
the Unyielding option. Then right-click to exit Rigid Body Collector mode.
4. Select the shirt object, and choose Animation ➪ reactor ➪ Apply Modifier ➪ Cloth Modifier.
5. With the shirt object still selected, choose Animation ➪ reactor ➪ Create Object ➪ Cloth Collection
to create a Cloth collection that contains the shirt object.
6. Now preview the animation before computing it. Select Animation ➪ reactor ➪ Preview Animation
to open the Preview window, and press the P button. When the animation finishes (and the shirt
falls on the chair), close the Preview window.
7. Select Animation ➪ reactor ➪ Create Animation to have the keys computed for this animation.
Then click the Play button to see the final animation.
Figure 43.5 shows one frame of the finished animation.

FIGURE 43.5
reactor can be used to simulate cloth falling realistically over a chair.

1053