The Rate behavior increases a parameter’s value over time, with the rate of increase determined by the Rate slider. Unlike the Ramp behavior, this behavior has no end value, but continues to increase or decrease the parameter it’s applied to until the end of the parameter.

Note: To decrease a parameter over time, enter a negative value into the Rate parameter.

Adjust this behavior using the controls in the Behaviors Inspector:

  • Rate: A slider that sets a rate of increase over time for the affected parameter, measured in percentage increase per second.

  • Curvature: A slider that eases the acceleration at which the Rate behavior transitions from the Start Value to the End Value. Higher Curvature values result in an ease in/ease out effect, beginning slowly, gradually speeding up as the behavior continues, then gradually slowing to a stop as it reaches the end. Because Curvature is defined by the length of the behavior in the Timeline, this parameter does not affect the overall duration of the effect.

  • End Offset: A slider that offsets the end of the behavior’s effect relative to the last frame of its position in the Timeline, in frames. Adjust this parameter to make the behavior stop before the end of the behavior bar in the Timeline. Using this slider to stop the effect, instead of trimming the end of the behavior bar in the Timeline, freezes the last random value generated by this behavior for the remaining duration of the object. Trimming the end of the behavior bar resets the parameter to its original value.

  • Apply To: A pop-up menu that shows the parameter affected, and that can be used to reassign the behavior to another parameter.