Lesson 3: Traits

Traits add behavior to objects. The @grabbable trait lets users pick up objects in VR.

Concept: @grabbable, @physics

orb "Ball" {
  color: "yellow"
  scale: 0.3

  @grabbable
  @physics {
    mass: 1.0
    restitution: 0.8   # bounciness
  }
}

The @ prefix marks a trait — a reusable behavior module.

Common Traits

Trait	Effect
@grabbable	User can pick it up in VR
@physics	Simulates gravity + collisions
@synced	State synced across users
@highlight	Glows on hover

Try it:

orb "PhysicsBall" {
  color: "red"
  scale: 0.4
  position: [0, 2, -2]

  @physics {
    mass: 0.5
  }
}

Your turn:

Add @grabbable to make the ball pickable, then add @physics to make it fall with gravity.

[Check Answer] [Hint] [Skip]

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Next: Lesson 4 – Templates