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RPH/RPM/RPS Specifies the units of measure for Target Revs in revolutions
per hour, minute, or second. Available only if you turn on Feedback On.
Gain Specifies how quickly the force adjusts to approaching the target speed.
If set to 100%, the correction is immediate. If set lower, a slower and "looser"
response occurs. Available only if you turn on Feedback On.
NOTE Setting Gain above 100% can result in over-correction, but is sometimes
necessary to overcome damping from other system settings, such as IK damping.
Periodic Variation group
These settings introduce variations into the force by affecting the Basic Torque
value randomly. You can set two waveforms to produce a noise effect.
Enable Turn on to enable the variations.
2700 | Chapter 14 Space Warps and Particle Systems