switch to rapier character controller

it already supports custom gravity and custom up direction

src/plugins/player.rs

@@ -1,6 +1,7 @@
 use bevy::prelude::*;
+use bevy_rapier3d::prelude::*;
 
-use crate::components::{character_controller::CharacterMotion, tags::Player};
+use crate::components::tags::Player;
 
 pub struct PlayerPlugin;
 
@@ -10,7 +11,12 @@ impl Plugin for PlayerPlugin {
 	}
 }
 
-fn keyboard_input(key: Res<ButtonInput<KeyCode>>, mut player: Single<&mut CharacterMotion, With<Player>>) {
+fn keyboard_input(
+	key: Res<ButtonInput<KeyCode>>,
+	mut player: Single<(&mut KinematicCharacterController, &mut Transform), With<Player>>,
+	time: Res<Time>,
+) {
+	let (mut controller, mut transform) = player.into_inner();
 	let mut move_vec = Vec3::ZERO;
 
 	if key.pressed(KeyCode::KeyW) {
@@ -25,5 +31,15 @@ fn keyboard_input(key: Res<ButtonInput<KeyCode>>, mut player: Single<&mut Charac
 		move_vec.x = 1.0;
 	}
 
-	player.0 = move_vec;
+	let angle = if key.pressed(KeyCode::KeyQ) {
+		-0.1
+	} else if key.pressed(KeyCode::KeyE) {
+		0.1
+	} else {
+		0.0
+	};
+	transform.rotate_z(angle * time.delta_secs());
+	controller.up = transform.up().as_vec3();
+	move_vec += transform.down().as_vec3();
+	controller.translation = Some(move_vec * time.delta_secs());
 }