Function spawn_particles 

pub fn spawn_particles(
    dim: impl Arg<String>,
    pos: impl Arg<Point>,
    particle: impl Arg<ParticleOptions>,
    count: impl Arg<i32>,
    spread: impl Arg<Point>,
    speed: impl Arg<f64>,
) -> bool

Spawns count particles around pos (none: one, spread its motion).

Calls SpawnParticles; what no one answers reads as the reply’s default.