three_dart Animation

Iron Law

Always call mixer.update(delta) inside the onAnimate callback — the AnimationMixer does not advance on its own, even when actions are playing.

Procedural Animation (Simple)

// In onAnimate callback — delta is seconds since last frame
void onAnimate(double delta) {
  mesh.rotation.y += delta;
  mesh.position.y = math.sin(clock.getElapsedTime()) * 0.5;
  renderer.render(scene, camera);
}

AnimationMixer (Keyframe / GLTF Animations)