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386 Chapter 12: Animation
Note:
When you assign a Position constraint via the
Animationmenu,thesoftwareassignsaPosition
List controller to your object. In the Position List
rollout list you will find Position Constraint. This
is the actual Position Constra int controller. To
view the Position Constraint rollout, double-click
Position Constraint in the list.
Add position tar get—Adds new target objects that
influence the position constrained object.
Delete position tar get—Removes targets. Once a
target is removed, it will no longer influence the
constrained object.
Weig h t—Assigns and animates weight values for
each target.
K eep Initial Of fset—Use Keep Initial Offset
to preserve the original distance between the
constrained object and the target object. This
prevents the constrained object f rom snapping to
thetargetobject’spivot.ThedefaultisOff.
Link Constra int
Animation menu > Constraints > Link Constraint
A link constraint enables the robot ar ms to pass a ball.
A Lin k constraint is u sed to animate an object
linking from one target object to another.
The Link constraint causes an object to inherit the
position, rotation, and scale of its target object.
An example of using a link constraint is to pass
a ball f rom one hand to another. Assume that at
frame 0 the ball is in the rig ht hand. The hands
are animated to meet at frame 50, where the ba ll is
passed to the left hand, and then spread apart until
frame 100.
Procedures
Example: To assign a Link constraint:
1.
IntheTopviewport,createasphereandabox.
2. Select the sphere.
3. Open the Motion panel.
4. Expand > Assign Controller rollout.
5. Select the Transform: Position/Rotat ion/Scale
controller.
6. Click Assign Controller.
7. Choose Link Constraint.
It is recommended that you add a Link To
World before link ing to any target objects. This
will allow you to animate the object on its own,
before the first link to a target object t akes place.
You can also assign Link Constraints t hrough
the Animation > Constraints submenu.
To access the Link constraint’ s parameters through
the Motion panel:
1.
Select the Link-constrained object.
2. Choose Motion panel > Link Params rollout.
Example: To assign the Link constraint and animate
links:
1.
Movethetimeslidertoframe0.
2. IntheTopviewport,createasphere,acylinder
and a box.