All graphs have a flow of execution shown as pulsing links between exec pins on the graph's nodes. For
regular graphs, such as the EventGraph of a Blueprint, this flow is visualized during play as it is
dependent on the firing of events. The AnimGraph is different in that it displays the flow of execution
at all times since it is not event-based and is being evaluated each frame.
In the AnimGraph, the flow of execution represents poses being passed from one node to another. Some
nodes, such as Blends, have multiple inputs and make a
decision internally on which input is currently part of the flow of execution. This determination is usually
dependent on some external input, like the value passed to a data pin.
In the example below, the same blend node from above switched the execution flow between its inputs based on
the value of its Alpha pin (which is being manually set):
Blend with Alpha of 1.0 - Input B is used