Time Field Layer
LayerTime Field Layer
This Field outputs a predefined, consistently growing value (sinus or saw tooth and other envelope curves can also be defined, which, restrict the value output to 0-1, for example) in accordance with the animation time, which can be blended with other Fields and Modifier Layers in the respective Field lists (e.g., for Effectors or Deformers). Note that this Field does not affect orientation.
This also makes it possible to created repeating effects without having to define this in the Timeline.