8

Speed By Surface Operator 165
14.
Click the Speed By Surface operator. Set Speed
to 300 if necessary. In the Direction group,
choose Out Of Surface, and then drag the ti me
slider.
After exiting the emitter, the particles always
move away from the nearest surface, with the
result that they end up milling about in the
center of the cylinder.
15. Gradually increase the Speed value, up to 1,000
or so.
The particles start to spread out vertically, and
eventually start moving so fast that they escape
the cylinder. You c an make them stay inside
the cy linder by letting them accelerate more
quickly,sotheycanturnbeforemovingpast
the nearest surface.
16. Increase the Accel Limit setting until the
part icles no longer exit the cylinder.
17. Try giving the particles more room to move
about in by increasing the size of the emitter.
Also try changing other settings throughout
the particle system to see their effects. The
possibilities don’t end here, and the more you
experiment, the more you’ll learn about how
this powerful operator works.
Interfa ce