fn apply_turn(
app: &Playground,
domains: &mut Domains,
domain: DomainHandle<EuclideanR4>,
turn: Rotor4,
) -> Result<(), DomainError>fn apply_turn(
app: &Playground,
domains: &mut Domains,
domain: DomainHandle<EuclideanR4>,
turn: Rotor4,
) -> Result<(), DomainError>