big_space_with_trim/examples/demo.rs

use bevy::prelude::*;
use big_space::{FloatingOrigin, GridCell};

fn main() {
    App::new()
        .add_plugins(DefaultPlugins.build().disable::<TransformPlugin>())
        .add_plugin(big_space::FloatingOriginPlugin::<i64>::new(0.5, 0.01))
        .add_plugin(big_space::debug::FloatingOriginDebugPlugin::<i64>::default())
        .insert_resource(ClearColor(Color::BLACK))
        .add_startup_system(setup)
        .add_system(movement)
        .add_system(rotation)
        .run()
}

#[derive(Component)]
struct Mover<const N: usize>;

fn movement(
    time: Res<Time>,
    mut q: ParamSet<(
        Query<&mut Transform, With<Mover<1>>>,
        Query<&mut Transform, With<Mover<2>>>,
        Query<&mut Transform, With<Mover<3>>>,
    )>,
) {
    let delta_translation = |offset: f32| -> Vec3 {
        let t_1 = time.elapsed_seconds() + offset;
        let dt = time.delta_seconds();
        let t_0 = t_1 - dt;
        let pos =
            |t: f32| -> Vec3 { Vec3::new(t.cos() * 2.0, t.sin() * 2.0, (t * 1.3).sin() * 2.0) };
        let p0 = pos(t_0);
        let p1 = pos(t_1);
        let dp = p1 - p0;
        dp
    };

    q.p0().single_mut().translation += delta_translation(20.0);
    q.p1().single_mut().translation += delta_translation(251.0);
    q.p2().single_mut().translation += delta_translation(812.0);
}

#[derive(Component)]
struct Rotator;

fn rotation(time: Res<Time>, mut query: Query<&mut Transform, With<Rotator>>) {
    for mut transform in &mut query {
        transform.rotate_x(3.0 * time.delta_seconds());
    }
}

fn setup(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    let mesh_handle = meshes.add(
        shape::Icosphere {
            radius: 0.1,
            ..default()
        }
        .try_into()
        .unwrap(),
    );
    let matl_handle = materials.add(StandardMaterial {
        base_color: Color::YELLOW,
        ..default()
    });

    commands.spawn((
        PbrBundle {
            mesh: mesh_handle.clone(),
            material: matl_handle.clone(),
            transform: Transform::from_xyz(0.0, 0.0, 1.0),
            ..default()
        },
        GridCell::<i64>::default(),
        Mover::<1>,
    ));
    commands.spawn((
        PbrBundle {
            mesh: mesh_handle.clone(),
            material: matl_handle.clone(),
            transform: Transform::from_xyz(1.0, 0.0, 0.0),
            ..default()
        },
        GridCell::<i64>::default(),
        Mover::<2>,
    ));
    commands
        .spawn((
            PbrBundle {
                mesh: mesh_handle.clone(),
                material: matl_handle.clone(),
                transform: Transform::from_xyz(0.0, 1.0, 0.0),
                ..default()
            },
            GridCell::<i64>::default(),
            Rotator,
            Mover::<3>,
        ))
        .with_children(|parent| {
            parent.spawn(PbrBundle {
                mesh: mesh_handle,
                material: matl_handle,
                transform: Transform::from_xyz(0.0, 0.0, 1.0),
                ..default()
            });
        });

    // light
    commands.spawn((
        PointLightBundle {
            transform: Transform::from_xyz(4.0, 8.0, 4.0),
            point_light: PointLight {
                intensity: 10_000f32,
                ..default()
            },
            ..default()
        },
        GridCell::<i64>::default(),
    ));

    // camera
    commands.spawn((
        Camera3dBundle {
            transform: Transform::from_xyz(0.0, 0.0, 8.0)
                .looking_at(Vec3::new(0.0, 0.0, 0.0), Vec3::Y),
            ..default()
        },
        GridCell::<i64>::default(),
        FloatingOrigin,
    ));
}