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362 Chapter 12: Animation
7.
On the upper toolbar, click Add Slave, and
then click t he box in the Perspective viewport.
8. On the pop-up menu that appears, choose
Transform > Po sition > X Position.
In the Reactions list, the slave entry Box01 / X
Position appears under the master entry. Also, a
new state appears in the States list for the newly
added slave track. This simply says that, when
theslidervalueis0,thebox’sXpositionshould
be what it is currently. However, a reaction
needs at least two states to be meaningful. You’l l
learn how to accomplish this shortly.
Next, you’ll discover a different way to add a
slave track.
9. In the Perspective viewport, select the sphere.
10. On the upper toolbar, click Add Selected.
This causes the pop-up menu to appear at the
mouse cursor.
11. From the pop-up menu, choose Object
(Sphere) > Hemisphere.
The sphere’s Hemisphere track is added as a
slave of the slider, and a new state for the two is
added to the States list.
You now have two states in t he States list, but
in both cases the state value (that is, the slider
value) is the same, so you really need only one.
YoucanresolvethisbyaddingtheHemisphere
slave tr ack to the first state and then eliminating
the second state.
12. In the Reactions list, click the Sphere01 /
Hemisphere entry, and in the States list, click
the State01 entry.
13. On the center toolbar, above the States list, click
the Append Selected button.
This adds the Hemisphere track to State01.
Now you can delete the second, superfluous
state.
14. In the States list, click the State02 entry, and
then on the toolbar above the States list, click
the D elete State button.
State02 goes away.
Currently, the box is where you created it, but
you mig ht want it to start out at a different
location. However, b ecause the b ox is a slave
of the slider , you can’t move it freely on the X
axis. You’ll use Reaction Manager to set the X
position of the bo x to a specific value.
15. In the States list, position the click and hold
the mouse cursor over the Box01 / X Position
>Valueentry.