rememberSceneClock

A monotonic per-frame clock as a State<Float> — seconds elapsed since the composable entered the composition. Reading the value triggers recomposition every frame, so use it with a by delegate inside scene composables to drive animations cheaply:

val time by rememberSceneClock()
Group(position = Position(cos(time) * 3f, 0f, sin(time) * 3f)) {
    Sphere(material = earth)
}

This is the observable-value layer over OnFrame: use it when you want elapsed time as a state read in composition. For a per-frame side effect that should not recompose, use OnFrame directly; for property animations with easing prefer animateFloatAsState / Animatable.