A variety of sensors detect user interactivity with a scene, allowing authors to define animation responses in a device-independent, display-independent way.

User interactivity is accomplished by sensing user actions, which create events that are sent via ROUTE connections.

Sensor output values are produced by CylinderSensor, KeySensor, PlaneSensor, StringSensor and TouchSensor nodes.

The supporting Chapter 8 slideset and course videos (NPS, YouTube) for X3D for Web Authors are available online via X3dGraphics.com.

Authors can use a 10-step algorithm checklist (with example diagram) as an event-animation design pattern that helps build consistent event-routing chains. The supporting Chapter 7 slideset and course videos (NPS, YouTube) for X3D for Web Authors are available online via X3dGraphics.com.

The quick-reference sheet X3D Event Utility Nodes: Field Event Diagrams illustrates the functionality of the event utility nodes. These nodes receive and pass values that are sent via ROUTE connections.