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346 Chapter 12: Animation
7.
On the upper toolbar, click Add Slave, and
then click the box in the Perspective viewport.
8. On the pop-up menu that appears, choose
Transform > Position > 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’ll
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 the States list, but
in both cases the st ate value (that is, the slider
value) is the same, so you really need only one.
YoucanresolvethisbyaddingtheHemisphere
slave track 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 t rack 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 Delete St ate button.
State02 goes a way.
Currently, the box is where you created it, but
you mig ht want it to start out at a different
location. However, because the box 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 box to a specific value.
15. In the States list, position the click and hold
the mouse cursor over the B ox01 / X Position
>Valueentry.