Event Nodes¶

Event nodes trigger actions on objects when a specific event occurs. They compile into the events[] array in scene.json.

All event nodes require an AR Object node connected to their Target input.

Available actions¶

All event nodes share the same set of actions:

Action	Description
Toggle Visibility	Show/hide the object each time the event fires
Play Animation	Play a named animation clip embedded in the GLB
Set Rotation Y	Set the object's Y rotation to a specific value (radians)
Set Scale	Set the object's uniform scale to a specific value

Node ID: WEBARNodeTap

Fires when the user taps or clicks on the target object.

Requires: Enable Tap must be on in the main panel (Interactions → Enable Tap).

Inputs:

Socket	Type	Description
Target	Object	The object that receives tap events

Properties:

Property	Description
Action	What happens when the object is tapped
Animation	Animation clip name (Play Animation only)
Rotation Y	Target rotation value in radians (Set Rotation Y only)
Scale	Target scale value (Set Scale only)

Compiled output:

{
  "event": "tap",
  "target": "Button",
  "actions": [
    { "type": "toggle_visibility" }
  ]
}

Node ID: WEBARNodeUpdate

Fires every frame (the render loop update event). Use this for one-time setup actions or frame-by-frame state changes.

Use sparingly

Update fires every frame (~60 times per second). Expensive actions here can hurt performance. For continuous animations, use Animation Nodes instead.

Properties: same action set as Tap.

Compiled output:

{
  "event": "update",
  "target": "MyObject",
  "actions": [
    { "type": "play_animation", "name": "Idle" }
  ]
}

Node ID: WEBARNodeTimer

Fires at a fixed interval, repeatedly.

Inputs:

Socket	Type	Description
Target	Object	The object the action applies to

Properties:

Property	Range	Description
Interval (s)	0.1–60	Time in seconds between each trigger
Action	—	Same action set as Tap

Example use case: Reset an object's rotation to zero every 3 seconds.

Compiled output:

{
  "event": "timer",
  "target": "Wheel",
  "interval": 3.0,
  "actions": [
    { "type": "set_rotation", "value": 0.0 }
  ]
}

Tap to show/hide an object:

AR Object (Button) ──► Tap → Toggle Visibility → AR Object (Panel)

Auto-play animation on load:

AR Object (Character) ──► Update → Play Animation → "Walk"

Periodically reset rotation:

AR Object (Spinner) ──► Timer (5s) → Set Rotation Y → 0