8

Scale Operator 153
14.
Copy and p aste the Age Test as an instance from
Event 03 to Event 04.
In this event, part icles shr ink f rom full size to
10 percent of their original size over 30 frames.
15. Play the animation.
Next, you’ll use a Noise controller to cause the
particles in Event 03 to pulsate in size.
16. Add a second Sca le operator to Event 03, b elow
the existing Scale operator. Set it to Relative
Successive, and set Sync By to Event Duration.
ThenameofthisoperatorshouldbeScale04.
17. In Particle view, right-click the Scale Factor X
% parameter field on the Scale 04 rollout, and
choose Show In Track View.
The Curve Editor opens with the X Scale Factor
parameter hig h lig hted.
18. Right-click the X Scale Factor item and choose
Assign Controller f rom the menu.
19. In the Assign Float Controller dialog,
double-click Noise Float.
The Noise Controller dialog opens.
20. Set Strength to 200, and to the right of Strength,
turn on the >0 check box.
21. Copy this controller, and then paste it as
instances to Y Scale Factor and Z Scale Factor.
Although the Scale operator defaults to
constraining all scale factors to the same
value, thus scaling particles uniform ly,
changing controllers in Track V iew works on a
per-parameter basis.
22. Play the animation.
This time, the particles grow in size for 30
frames, then pulsate in size for the next 30
frames, and then shrink from the size at the end
of Event 03 to 10 percent of that over the next
30 frames.
Interfa ce
The user interface appears in the parameters panel,
on the right side of the P article View dialog.
Type
The scaling Type setting includes options that let
you scale particles once in an event or repeatedly,
and apply scaling as an absolute or relative factor.
Default=Overw r ite Once.
Overwr ite Once—Sets the scale onetimeonly as
an absolute percentage value, disregarding any
previous scaling.
Toproducearangeofdifferentbirthsizes,and
specify the scaling explicitly, use Overwrite Once
w ith animated scale factors.
Inher it Once—Sets the scale onetimeonly as a
percentage of existing sca ling . The existing scaling