Transform constraints

Two engine components let one entity track another every frame, with no script — like Unity's LookAtConstraint and PositionConstraint:

• Look At — rotate this entity to face a target.
• Follow Target — move this entity to a target's position plus an offset.

Add them from the Inspector's Add Component menu. They run in the editor Play Mode, in standalone builds, and they compose — an entity can both follow and look at a target (a companion drone, a chase camera rig, a name-plate, a turret head).

Look At

Rotates the entity to point at the target entity each frame.

Field	Meaning
Target	The entity to face.
Yaw only	When on, only rotate around Y (stay upright) — good for characters and turrets. Off (default) is full 3D aim.

"lookAt": { "target": "player", "yawOnly": true }

Follow Target

Moves the entity to the target's position plus an offset each frame.

Field	Meaning
Target	The entity to follow.
Offset	Offset from the target (the relativePosition field in JSON). Default [0, 0, 0].
Absolute	Offset is in world space (on) vs rotated into the target's local frame (off, default — so an offset like "behind" stays behind as the target turns).
Follow rotation	Also copy the target's rotation. Default off.
Smoothing	0 (default) snaps to the target each frame; > 0 is exponential smoothing — higher is snappier, lower lags more.

"followTarget": { "target": "player", "relativePosition": [2, 2.5, 2], "absolute": true, "smoothing": 6 }

Assigning the target

The Target field is a drop slot, just like a Unity object field. Set it either way:

• Drag an entity from the Hierarchy onto the field, or
• pick it from the field's dropdown.

Driving them from a script

The target and every field are plain component data, so a script can change them at runtime with setComponent — it merges a patch onto the current component, leaving the other fields untouched:

class Companion extends Behaviour {
  onStart() {
    // Start following whoever is closest, behind and above them.
    const player = this.players.getAll()[0]
    if (player) this.setComponent('followTarget', { target: player.id })
  }

  retarget(enemyId) {
    this.setComponent('lookAt', { target: enemyId })   // turn to face a new foe
    this.setComponent('followTarget', { smoothing: 10 }) // …and tighten the follow
  }
}

Use addComponent to add a constraint that wasn't there, removeComponent('lookAt') to drop it, and getComponent('followTarget') to read its current values (a snapshot — see Reading & writing components).

TIP

The Scripted Player example (?example=scriptedplayer) has a pink Companion drone that uses followTarget + lookAt to hover near the player and watch it — no script on the drone at all.