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free_look_camera.gd

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+#Copyright © 2022 Marc Nahr: https://github.com/MarcPhi/godot-free-look-camera
+extends Camera3D
+
+@export_range(0, 10, 0.01) var sensitivity : float = 3
+@export_range(0, 1000, 0.1) var default_velocity : float = 5
+@export_range(0, 10, 0.01) var speed_scale : float = 1.17
+@export_range(1, 100, 0.1) var boost_speed_multiplier : float = 3.0
+@export var max_speed : float = 1000
+@export var min_speed : float = 0.2
+
+@onready var _velocity = default_velocity
+
+func _input(event):
+	if not current:
+		return
+		
+	if Input.get_mouse_mode() == Input.MOUSE_MODE_CAPTURED:
+		if event is InputEventMouseMotion:
+			rotation.y -= event.relative.x / 1000 * sensitivity
+			rotation.x -= event.relative.y / 1000 * sensitivity
+			rotation.x = clamp(rotation.x, PI/-2, PI/2)
+	
+	if event is InputEventMouseButton:
+		match event.button_index:
+			MOUSE_BUTTON_RIGHT:
+				Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED if event.pressed else Input.MOUSE_MODE_VISIBLE)
+			MOUSE_BUTTON_WHEEL_UP: # increase fly velocity
+				_velocity = clamp(_velocity * speed_scale, min_speed, max_speed)
+			MOUSE_BUTTON_WHEEL_DOWN: # decrease fly velocity
+				_velocity = clamp(_velocity / speed_scale, min_speed, max_speed)
+
+func _process(delta):
+	if not current:
+		return
+		
+	var direction = Vector3(
+		float(Input.is_physical_key_pressed(KEY_D)) - float(Input.is_physical_key_pressed(KEY_A)),
+		float(Input.is_physical_key_pressed(KEY_E)) - float(Input.is_physical_key_pressed(KEY_Q)), 
+		float(Input.is_physical_key_pressed(KEY_S)) - float(Input.is_physical_key_pressed(KEY_W))
+	).normalized()
+	
+	if Input.is_physical_key_pressed(KEY_SHIFT): # boost
+		translate(direction * _velocity * delta * boost_speed_multiplier)
+	else:
+		translate(direction * _velocity * delta)