boxddd 0.2.0

Safe, ergonomic Rust bindings for Box3D
Documentation 
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use boxddd::prelude::*;

const TIME_STEP: f32 = 1.0 / 60.0;
const SUB_STEPS: i32 = 4;

fn main() -> boxddd::Result<()> {
    let mut world = World::new(
        WorldDef::builder()
            .gravity(Vec3::new(0.0, -10.0, 0.0))
            .build(),
    )?;

    spawn_scene(&mut world);

    for frame in 1..=120 {
        world.try_step(TIME_STEP, SUB_STEPS)?;

        if frame % 30 == 0 {
            print_snapshot(&world, frame)?;
        }
    }

    let capacity = world.max_capacity();
    println!(
        "max capacity: static_bodies={} dynamic_bodies={} contacts={}",
        capacity.static_body_count, capacity.dynamic_body_count, capacity.contact_count
    );

    Ok(())
}

fn spawn_scene(world: &mut World) {
    let ground = world.create_body(BodyDef::builder().position([0.0, -0.5, 0.0]).build());
    world.create_hull_shape(ground, &ShapeDef::default(), &BoxHull::new(10.0, 0.5, 10.0));

    let shape_def = ShapeDef::builder().density(1.0).friction(0.55).build();
    let cube = BoxHull::cube(0.35);
    for layer in 0..6 {
        for column in 0..6 {
            let x = -2.1 + column as f32 * 0.72 + layer as f32 * 0.02;
            let y = 0.45 + layer as f32 * 0.72;
            let z = -0.8 + (column % 3) as f32 * 0.55;
            let body = world.create_body(
                BodyDef::builder()
                    .body_type(BodyType::Dynamic)
                    .position([x, y, z])
                    .build(),
            );
            world.create_hull_shape(body, &shape_def, &cube);
        }
    }
}

fn print_snapshot(world: &World, frame: u32) -> boxddd::Result<()> {
    let counters = world.try_counters()?;
    let profile = world.try_profile()?;
    let awake_bodies = world.try_awake_body_count()?;
    let sleeping_enabled = world.try_sleeping_enabled()?;
    let worker_count = world.try_worker_count()?;

    println!(
        concat!(
            "frame={:03} bodies={} awake={} shapes={} contacts={} islands={} ",
            "tree_height={} tasks={} sleeping={} workers={}"
        ),
        frame,
        counters.body_count,
        awake_bodies,
        counters.shape_count,
        counters.contact_count,
        counters.island_count,
        counters.tree_height,
        counters.task_count,
        sleeping_enabled,
        worker_count,
    );
    println!(
        "  profile: step={:.3} collide={:.3} solve={:.3} pairs={:.3} transforms={:.3}",
        profile.step, profile.collide, profile.solve, profile.pairs, profile.transforms
    );

    Ok(())
}