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Inertial Motion Blending Sample

This sample demonstrates how to use inertial motion blending.

What does it show?

This sample demonstrates inertial motion blending by comparing it with a regular linear blending.

Converting from GameObject to Entity prefab

It uses two rigged characters (game objects with a RigComponent). The setup of the characters is similar to the setup in the My FirstAnimation Clip scene.

One character has an InertialBlendingGraphComponent, which contains two clips, and will be converted into an InertialBlendingGraphSetup. A system called InertialBlendingGraphSystem takes care of building and updating the animation graph that performs inertial motion blending, by using an TransitionByBoolNode.

The other character is setup in an almost identical way, but the InertialBlendingGraphComponent is configured so that the TransitionByBoolNode uses linear blending (crossfade) instead.

In addition, a DurationComponent and a DurationSystem take care of setting the duration of the blends with a ui slider.

ComponentSystems

The InertialBlendingGraphSystem is a ComponentSystem that handles 3 operations:

  • Creation of the DFG (DataFlowGraph) with:
    • Time nodes (DeltaTimeNode and TimeCounterNode);
    • Two ClipPlayerNodes to sample the clips that will be blended
    • A TransitionByBool that blends the result of the two ClipPlayerNodes.
    • An EntityNode to write the results to the ECS system.
  • Destruction of the DFG.

The BlendTriggerSystem takes care of triggering a blend when the "space" key is pressed.

The DurationSystem reads the duration from the DurationComponent each frame, and updates both graphs with it.

Time Management

Each rig entity has a component DeltaTime. This component is updated by the UpdateAnimationDeltaTime system. Using a ComponentNode, the graph connects the value of the DeltaTime component to the converter node ConvertDeltaTimeToFloatNode, and this node's output is used as an input for the nodes that require a delta time.