pub fn pack_particles(
specks: &[Speck],
kind: ParticleKind,
time: f32,
color: [f32; 3],
) -> Vec<ParticleInstance>pub fn pack_particles(
specks: &[Speck],
kind: ParticleKind,
time: f32,
color: [f32; 3],
) -> Vec<ParticleInstance>