src/comps/core/markers/bullet.rs

@@ -1,14 +1,16 @@
 use bevy::{
     prelude::{Component, Vec3},
     reflect::Reflect,
-    time::Timer,
+    time::Timer, ecs::reflect::ReflectComponent,
 };
 
 use crate::comps::core::weapons::caliber::Caliber;
 
-#[derive(Component, Reflect)]
+#[derive(Component, Reflect, Default)]
+#[reflect(Component)]
 pub struct BulletMarker {
     pub caliber: Caliber,
     pub starting_point: Vec3,
     pub timer: Timer,
+    pub current_velocity: Vec3,
 }

src/comps/core/weapons/caliber.rs

@@ -1,13 +1,15 @@
 use bevy::reflect::Reflect;
 
 #[allow(unused)]
-#[derive(Clone, Reflect)]
+#[derive(Clone, Reflect, Default)]
 pub enum Caliber {
     /// 5.56x45mm
     NATO556,
     /// 9x19mm
+    #[default]
     Parabellum9mm,
-    /// 5.45x39mm
+    /// 5.45x39mm (7N6M)
+    /// Reference: [Wikipedia](https://en.wikipedia.org/wiki/5.45%C3%9739mm)
     RU545
 }
 impl Caliber {
@@ -32,11 +34,12 @@ impl Caliber {
             Caliber::RU545 => 75.0,
         }
     }
+    /// Unit = kg
     pub fn mass(&self) -> f32 {
         match self {
-            Caliber::NATO556 => 0.1,
+            Caliber::NATO556 => 0.00402,
             Caliber::Parabellum9mm => 0.05,
-            Caliber::RU545 => 0.07,
+            Caliber::RU545 => 0.00343,
         }
     }
     pub fn linear_damping(&self) -> f32 {
@@ -60,4 +63,20 @@ impl Caliber {
             Caliber::RU545 => 0.06
         }
     }
+    /// Unit = m/s
+    pub fn muzzle_velocity(&self) -> f32 {
+        match self {
+            Caliber::NATO556 => 991.0,
+            Caliber::Parabellum9mm => todo!(),
+            Caliber::RU545 => 880.0,
+        }
+    }
+    /// Unit = m/s
+    pub fn velocity_shed(&self) -> f32 {
+        match self {
+            Caliber::NATO556 => todo!(),
+            Caliber::Parabellum9mm => todo!(),
+            Caliber::RU545 => 120.0,
+        }
+    }
 }

src/logic/core/guns/equipped_gun_collisions.rs

@@ -10,7 +10,6 @@ pub fn update_gun_position_on_collision(
     mut events: EventReader<EquippedGunCollisionEvent>,
 ) {
     for event in events.read() {
-        println!("Collision");
         for mut player_firing_info in query.iter_mut() {
             match event.collision_type {
                 CollisionEventType::Start => {
@@ -19,7 +18,6 @@ pub fn update_gun_position_on_collision(
                 },
                 CollisionEventType::End => {
                     player_firing_info.gun_colliding_with_object = false;
-                    //player_firing_info.gun_ready_pose = GunReadyPose::HighReady;
                 },
             }
         }

src/logic/core/guns/mod.rs

@@ -3,3 +3,4 @@ pub mod player_firing;
 pub mod shoot;
 pub mod inspect;
 pub mod equipped_gun_collisions;
+pub mod update_bullet;

src/logic/core/guns/shoot.rs

@@ -64,8 +64,6 @@ pub fn shoot_bullet(
         meshes,
         materials,
         firing_point,
-        forward,
-        up,
         caliber,
     );
 }
@@ -75,8 +73,6 @@ pub fn spawn_bullet(
     meshes: &mut ResMut<Assets<Mesh>>,
     materials: &mut ResMut<Assets<StandardMaterial>>,
     firing_point: Transform,
-    forward: Vec3,
-    _up: Vec3,
     caliber: Caliber,
 ) {
     commands.spawn((
@@ -88,6 +84,7 @@ pub fn spawn_bullet(
                 Duration::from_secs_f32(caliber.max_airtime_secs()),
                 TimerMode::Once,
             ),
+            current_velocity: firing_point.forward() * caliber.muzzle_velocity(),
         },
         MaterialMeshBundle {
             mesh: {
@@ -113,21 +110,8 @@ pub fn spawn_bullet(
             transform: firing_point,
             ..Default::default()
         },
-        RigidBody::Dynamic,
-        GravityScale(4.0),
-        Collider::ball(caliber.size()),
-        Velocity::zero(),
-        Damping {
-            linear_damping: caliber.linear_damping(),
-            angular_damping: caliber.angular_damping(),
-        },
-        ColliderMassProperties::Mass(caliber.mass()),
-        ExternalImpulse {
-            impulse: forward * caliber.impulse(),
-            torque_impulse: Vec3::ZERO,
-        },
+        RigidBody::KinematicPositionBased,
         ActiveEvents::COLLISION_EVENTS,
         CollisionGroups::new(Group::from_bits_retain(ColliderFlags::BULLETS.bits()), Group::from_bits_retain((ColliderFlags::SOLIDS | ColliderFlags::FLOOR).bits())),
-        Ccd::enabled(),
     ));
 }

src/logic/core/guns/update_bullet.rs

@@ -0,0 +1,17 @@
+use bevy::prelude::*;
+use bevy_rapier3d::prelude::*;
+
+use crate::comps::core::markers::bullet::BulletMarker;
+
+pub fn update_bullet(
+    mut commands: Commands,
+    mut bullets: Query<(Entity, &mut BulletMarker, &mut Transform)>,
+    time: Res<Time>,
+) {
+
+    for (bullet, mut marker, mut transform) in bullets.iter_mut() {
+        transform.translation += (marker.current_velocity * time.delta_seconds()) + (Vec3 { x: 0.0, y: -9.81, z: 0.0  } * time.delta_seconds() * marker.caliber.mass());
+        let vel_shed =  marker.caliber.velocity_shed();
+        marker.current_velocity -=  transform.forward() * vel_shed * time.delta_seconds();
+    }
+}

src/scenes/scene1/init.rs

@@ -7,7 +7,7 @@ use crate::{
         spawners::{player::player_spawner, spawn::SpawnerPlugin}, events::{bullet_collision::BulletCollisionEvent, equipped_gun_collision::EquippedGunCollisionEvent},
     },
     logic::core::{
-        guns::{despawn_shots::{despawn_muzzle_flashes, despawn_stray_bullets}, inspect::inspect_firearm, equipped_gun_collisions::update_gun_position_on_collision},
+        guns::{despawn_shots::{despawn_muzzle_flashes, despawn_stray_bullets}, inspect::inspect_firearm, equipped_gun_collisions::update_gun_position_on_collision, update_bullet::update_bullet},
         player::{
             camera_player_sync::{
                 follow_cursor_with_camera, update_camera_vertical_position, MouseMovementSettings,
@@ -62,6 +62,7 @@ pub fn load_scene(application: &mut App) {
     application.add_systems(Update, inspect_firearm);
     application.add_systems(Update, collision_handler);
     application.add_systems(Update, update_gun_position_on_collision);
+    application.add_systems(Update, update_bullet);
 
     //application.add_systems(Update, animate_player);
     //application.add_systems(Update, register_bullet_hits);

src/ui/editor/plugin.rs

@@ -5,7 +5,7 @@ use bevy_inspector_egui::bevy_egui::EguiPlugin;
 use crate::{
     comps::core::{markers::{
         holdable::{HoldableObjectData, InPlayerHands},
-        player::{Player, PlayerData, PlayerHand}, inspect_screen::InspectScreenSlotUiMarker,
+        player::{Player, PlayerData, PlayerHand}, inspect_screen::InspectScreenSlotUiMarker, bullet::BulletMarker,
     }, weapons::{firearm_data::FirearmData, magazine_data::MagazineData, caliber::Caliber, firearm::Firearm, spray_pattern::FirearmSprayPattern, firearm_state::FirearmState}},
     logic::core::{
         guns::player_firing::PlayerFiringInfo,
@@ -39,6 +39,7 @@ impl Plugin for MainEditorUiPlugin {
             .register_type::<PlayerValuesState>()
             .register_type::<FirearmData>()
             .register_type::<MagazineData>()
+            .register_type::<BulletMarker>()
             .register_type::<HoldableObjectData>()
             .register_type::<InPlayerHands>()
             .register_type::<PlayerData>()