use bevy::prelude::*;
use rand::{Rng, thread_rng};
pub fn scatter(mut commands: Commands, mut meshes: ResMut<Assets<Mesh>>) {
    let mut r = thread_rng();
    let cube = meshes.add(Cuboid::from_size (Vec3::splat(1.0)));
    for _ in 0 .. 100 {
    commands.spawn(PbrBundle{
        mesh: cube.clone(),
        transform: Transform::from_xyz((-0.5 + r.gen::<f32>()) * 100.0, (-0.5 + r.gen::<f32>()) * 100.0, (-0.5 + r.gen::<f32>()) * 100.0).with_scale(r.gen::<f32>() * Vec3::splat(3.0)), ..default()
    });
    }
}

mod obstacles;

        .add_systems(Startup, obstacles::scatter)