8

Path Constraint 381
Multiple Tar gets and Weighting
A constrained object can be influenced by several
target objects. When using multiple targets, each
targethasaweightvaluethatdefinesthedegreeby
which it influences the constrained object, relative
to other targets.
Using Weig ht is meaning f u l (and available) only
w ith multiple targets. A value of 0 means the
target has no influence. Any value greater than
0 c auses the target to influence the constr ained
object relative to other targets’ Weight sett i ngs.
For example, a target with a Weight value of 80 will
have twice the influence of a target with a Weight
value of 40.
Pr ocedur es
To assign a Path constraint:
1.
Create a Sphere with a radius of 10 and a Circle
with a radius of 60.
2. With the Sphere selected, choo se Animation
menu>Constraints>PathConstraint.
Youarenowinselecttargetmode.
3. In the viewport, select the Circle shape.
To access the Path constraint ’s parameter s through
the Motion panel:
1.
Select the Sphere.
2. Open the Motion panel.
3. In the PRS Parameters rollout, click the Position
button.
The Path constraint’s settings are located in the
Path Parameters rollout.
To as sign a Path constrai nt t hrough the Moti on
pan el:
1.
Create a Sphere with a radius of 10 and a Circle
with a radius of 60.
2. Select the Sphere.
3. On the Motion panel and click Parameters.
4. Open the Assign Controller rollout and select
the Position controller.
5. Click the Assign Controller button.
6. Choose Path Constraint from the Assig n
Position Controller dialog.
7. On the Motion panel, click Parameters.
8. In the Path Parameters rollout, click Add Path.
9. In the viewp ort, select the Circle.
To edit weight values:
1.
Open the Create > Shapes panel and create a
Line that is about 120 units long.
Tip: UsethediameteroftheCircletogaugethe
length of the Line.
2. Select the Sphere.
3. OntheMotionpanel,openthePathParameters
rollout.
4. Click the Add Path button and select the line.
TheSphereisnowaffectedequallybyboth
paths since the path weig hting defaults to 50
5. Adjust the Weight spinner or enter a numeric al
valuefortheweightvalue.
To animate weight values:
1.
Select the Sphere.
2. OntheMotionpanel,openthePathParameters
rollout.
3. Tur n on the Auto Key button.
4. Select the Line01 from the Path list.
5. Place the t ime slider at frame 50 and change the
Weig ht o f L ine01 to 75.
6. Movethetimeslideratframe100andchange
the Weight of Line01 to 10.
7. Select the Circle01 path and change its
Weig ht ing to 25.
8. Tur n off Auto Key and play the animation.