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Averaging one layer between two others


    This expression positions and maintains one layer at a balanced distance between two other layers. To achieve this effect, you need three layers in your composition.

To average one layer between two others:

  1. Start with three layers.
  2. Create motion paths for the first two layers in the Timeline.
  3. Select the Position property for the third layer and choose Animation > Add Expression.
  4. Select the default expression text and type the following:
  5. mul(.5, add(this_comp.layer(1).position, this_comp.layer(2).position))

  6. Click outside the expression to activate it.