8

Stretch Modifier 827
Pr ocedur es
To stretch an object:
1.
Select an object.
2. Apply Stretch.
3. On the Parameters rollout > Stretch Axis group,
chooseX,Y,orZ.
4. On the Parameters rollout > Stretch group,
enter a value in the Stretch field.
5. Adjust the Parameters rollout > Stretch group >
Amplify setting to change the amount of scaling
along the minor axes.
To limit a stretch:
1.
Apply a Stretch modifier to an object and
specify the stretch amounts and stretch axis.
2. On the Parameters rollout > Limits g roup, turn
on Limit Effect.
3. Set values for the Upper and Lower Limits to
define the Stretch boundaries on either side of
the Stretch center.
4. In the st ack display, choose the Center
sub-object level, and move the center to locate
the limited st retch effect.
Inter face
Modifier stack
Gizmo—At this sub-object level, you can transform
and animate the gizmo like any other object,
altering the effect of the Stretch modifier.
Translati ng the gizm o t ranslates its c enter an equal
distance. Rotating and scaling the gizmo ta kes
place with respect to its center.
CenterAt this sub-object level, you can translate
and animate the center, altering the Stretch gizmo’s
shape, and thus the shape of the stretched object.
Parameters rollout
Use options in the Parameters rollout to set the
following:
•Amountofstretch
•Majorstretchaxis
Area affected by the stretch
Stretch group
The Stretch group of the Parameters rollout has
two fields that control the amount of stretch
scaling applied.
Stretch—Setsthebasescalefactorforallthreeaxes.
The scale factor derived from the Stretch value
varies according to the sign of the value.
Positive stretch values define a scale factor
equal to Stretch+1. For example, a stretch value
of 1.5 y ields a scale factor of 1.5+1=2.5, or 250
percent.
Negative stretch values define a scale factor
equal to -1/(Stretch-1). For example, a
stretch value of -1.5 yields a scale factor of
-1/(-1.5-1)=0.4, or 40 percent.