Collider event never happening

[daniellga]

Hi! Thanks for your work.
I just started using bevy_rapier and I am struggling to make colliders work. In the example below, I have the player and the enemy spawn functions, they both have their colliders, without rigid-bodies. Below these I show the function that handle the intersection between these 2 elements.

I already checked and even when the position is basically the same I can't get IntersectionEvent to work. It's like there was never any coliders to begin with... Could you please give me some light on what I am doing wrong here?

pub struct InGamePlugin;
impl Plugin for InGamePlugin {
   fn build(&self, app: &mut App) {
       app.add_system_set(
           SystemSet::on_enter(GameState::InGame)
               .with_system(playership_spawn)
               .with_system(enemy_spawn),
       )
       .add_system_set(
           SystemSet::on_update(GameState::InGame)
               .with_system(playership_movement_system)
               .with_system(playershot_movement_system)
               .with_system(playershot_spawn)
               .with_system(pausemenu::transition_in_game_pause_menu)
               .with_system(despawn_if_out_of_screen)
               .with_system(handle_ship_intersection),
       )
       .add_system_set(
           SystemSet::on_exit(GameState::InGame)
               .with_system(despawn_ingamecomp), // TODO
       );
   }
}

fn playership_spawn(mut commands: Commands, assets: Res<AssetServer>) {
   let playership = ship::Ship::new_from_type(ship::ShipType::StandardShip);

   let playership_sprite_handle = assets.load(PLAYER_SPRITE_PATH);

   let collider = ColliderBundle {
       shape: ColliderShape::ball(50.).into(),
       collider_type: ColliderType::Solid.into(),
       flags: (ActiveEvents::INTERSECTION_EVENTS).into(),
       position: [0., -215.].into(),
       ..Default::default()
   };

   commands
       .spawn_bundle(SpriteBundle {
           transform: Transform {
               scale: Vec3::new(2.5, 2.5, 0.0),
               ..Default::default()
           },
           texture: playership_sprite_handle.clone(),
           ..Default::default()
       })
       .insert_bundle(collider)
       .insert(InGameComp)
       .insert(Player1)
       .insert(ColliderPositionSync::Discrete)
       .insert(playership);
}

fn enemy_spawn(mut commands: Commands, assets: Res<AssetServer>) {
   let enemyship = ship::Ship::new_from_type(ship::ShipType::StandardEnemy);

   let enemyship_sprite_handle = assets.load(ENEMY_SPRITE_PATH);

   let collider = ColliderBundle {
       shape: ColliderShape::ball(50.).into(),
       collider_type: ColliderType::Solid.into(),
       flags: (ActiveEvents::INTERSECTION_EVENTS).into(),
       position: [300., 250.].into(),
       ..Default::default()
   };

   commands
       .spawn_bundle(SpriteBundle {
           transform: Transform {
               scale: Vec3::new(2.5, 2.5, 0.0),
               ..Default::default()
           },
           texture: enemyship_sprite_handle.clone(),
           ..Default::default()
       })
       .insert_bundle(collider)
       .insert(InGameComp)
       .insert(Enemy)
       .insert(ColliderPositionSync::Discrete)
       .insert(enemyship);
}

fn handle_ship_intersection(
   mut commands: Commands,
   mut intersection_events: EventReader<IntersectionEvent>,
   query: Query<Entity, Or<(With<Player1>, With<Enemy>)>>,
) {
   for intersection_event in intersection_events.iter() {
       for entity in query.iter() {
           if intersection_event.collider1.entity() == entity {
               commands.entity(entity).despawn();
           }
           else if intersection_event.collider2.entity() == entity {
               commands.entity(entity).despawn();
           }
       }
   }
}

[daniellga]

Apparently it is needed a rigid-body for colliders to work. Is it intended? I didn't find any information about that in docs.

[sebcrozet]

By default collision-detection is disabled between two colliders if none of them is attached to a dynamic rigid-body. You can enable collision-detection between all colliders by setting the active collision types to ActiveCollisionTypes::all() for your colliders: https://rapier.rs/docs/user_guides/bevy_plugin/colliders#active-collision-types

Also, please note that non-sensor colliders generate contact events instead of intersection events. So you may want to read mut contact_events: EventReader<ContactEvent> instead of IntersectionEvent.