 
       # Add new children.
       @add layer for layer in layers
+
+      edgeLineSegments = []
 
       if @mesh.options.debug?()
         currentCluster = @mesh.options.currentCluster?()

      # Offset layers in the opposite direction.
      layer.position.copy(@position).negate() for layer in layers

    # Update object children.
    @autorun (computation) =>
      # Clean up previous children.

        return unless layer.ready()

      true

    @edgeLineSegments = new ReactiveField []

    @boundingBox = new ReactiveField null

