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Chapter 42: Using Space Warps
FIGURE 42.1
The Force Space Warps: Motor, Vortex, Path Follow, Displace, Wind, Push, Drag, PBomb, and Gravity

The Feedback On option causes the force to change as the object’s speed changes. When this option is off,
the force stays constant. You can also set Target Revolution units in revolutions per hour (RPH), revolutions
per minute (RPM), or revolutions per second (RPS), which is the speed at which the force begins to change
if the Feedback option is enabled. The Reversible option causes the force to change directions if the Target
Speed is reached, and the Gain value is how quickly the force adjusts.
The motor force can also be adjusted with Periodic Variations, which cause the motor force to increase and
then decrease in a regular pattern. You can define two different sets of Periodic Variation parameters: Period
1, Amplitude 1, Phase 1; and Period 2, Amplitude 2, Phase 2.

For particle systems, you can enable and set a Range value. The Motor Space Warp doesn’t affect particles
outside this distance. At the bottom of the Parameters rollout, you can set the size of the gizmo icon. You
can find this same value for all Space Warps.
Figure 42.2 shows the Motor Space Warp twisting the particles being emitted from the Super Spray particle
system in the direction of the icon’s arrow.
Push
The Push Space Warp accelerates objects in the direction of the Space Warp’s icon from the large cylinder
to the small cylinder. Many of the parameters for the Push Space Warp are similar to those for the Motor
Space Warp. Using the Parameters rollout, you can specify the force Strength in units of newtons or
pounds.
The Feedback On option causes the force to change as the object’s speed changes, except that it deals with
Target Speed instead of Target Revolution like the Motor Space Warp does.
The push force can also be set to include Periodic Variations that are the same as with the Motor Space
Warp. Figure 42.3 shows the Push Space Warp pushing the particles being emitted from the Super Spray
particle system.

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