automatically match velocity to the closest object

src/camera.rs

@@ -25,6 +25,7 @@ use bevy_xpbd_3d::prelude::*;
 use std::collections::HashMap;
 
 pub const INITIAL_ZOOM_LEVEL: f64 = 10.0;
+pub const MAX_DIST_FOR_MATCH_VELOCITY: f64 = 10000.0;
 
 pub struct CameraPlugin;
 
@@ -422,6 +423,7 @@ pub fn apply_input_to_player(
     key_input: Res<ButtonInput<KeyCode>>,
     q_audiosinks: Query<(&audio::Sfx, &AudioSink)>,
     q_target: Query<&LinearVelocity, (With<hud::IsTargeted>, Without<actor::PlayerCamera>)>,
+    q_closest: Query<(&Position, &LinearVelocity), (Without<hud::IsTargeted>, Without<actor::PlayerCamera>)>,
     mut q_playercam: Query<
         (
             Entity,
@@ -458,9 +460,22 @@ pub fn apply_input_to_player(
     {
         let target_v: DVec3 = if let Ok(target) = q_target.get_single() {
             target.0
+        } else {
+            let mut closest_distance = MAX_DIST_FOR_MATCH_VELOCITY;
+            let mut closest_velocity = None;
+            for (testpos, v) in q_closest.iter() {
+                let distance = (pos.0 - testpos.0).length();
+                if distance < closest_distance {
+                    closest_velocity = Some(v);
+                    closest_distance = distance;
+                }
+            }
+            if closest_velocity.is_some() {
+                closest_velocity.unwrap().0
             } else {
                 let relative_pos = pos.0 - jupiter_pos.0;
                 nature::orbital_velocity(relative_pos, nature::JUPITER_MASS)
+            }
         };
         // Handle key input
         if focused {