line of sight check

src/aim/mod.rs

@@ -4,9 +4,11 @@ use crate::{
     GameState,
     billboards::Billboard,
     loading_assets::UIAssets,
+    physics_layers::GameLayer,
     player::{Player, PlayerRig},
     tb_entities::EnemySpawn,
 };
+use avian3d::prelude::*;
 use bevy::prelude::*;
 use bevy_sprite3d::{Sprite3dBuilder, Sprite3dParams};
 use ops::sin;
@@ -93,6 +95,7 @@ fn update(
     query: Query<(Entity, &Transform), With<EnemySpawn>>,
     player_pos: Query<&Transform, With<Player>>,
     player_rot: Query<&Transform, With<PlayerRig>>,
+    spatial_query: SpatialQuery,
 ) {
     let Some(player_pos) = player_pos.iter().next().map(|t| t.translation) else {
         return;
@@ -117,6 +120,10 @@ fn update(
         let angle = player_forward.angle_between(delta.normalize());
 
         if angle < state.max_angle && distance < target_distance {
+            if !line_of_sight(&spatial_query, player_pos, delta, distance) {
+                continue;
+            }
+
             new_target = Some(e);
             target_distance = distance;
         }
@@ -139,6 +146,32 @@ fn update(
     }
 }
 
+fn line_of_sight(
+    spatial_query: &SpatialQuery<'_, '_>,
+    player_pos: Vec3,
+    delta: Vec3,
+    distance: f32,
+) -> bool {
+    if let Some(_hit) = spatial_query.cast_shape(
+        &Collider::sphere(0.1),
+        player_pos + -delta.normalize(),
+        Quat::default(),
+        Dir3::new(-delta).unwrap(),
+        &ShapeCastConfig {
+            max_distance: distance * 0.98,
+            compute_contact_on_penetration: false,
+            ignore_origin_penetration: true,
+            ..Default::default()
+        },
+        &SpatialQueryFilter::default().with_mask(LayerMask(GameLayer::Level.to_bits())),
+    ) {
+        // info!("no line of sight");
+        return false;
+    };
+
+    true
+}
+
 fn move_marker(mut query: Query<&mut Transform, With<Marker>>, time: Res<Time>) {
     for mut transform in query.iter_mut() {
         transform.translation = Vec3::new(0., 3. + (sin(time.elapsed_secs() * 6.) * 0.2), 0.);