Godot 3D First Person Camera Rotation

camera.gd

# MIT License
# 
# Copyright (c) 2023 ynot01
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

extends Camera3D

var SENSITIVITY = 1.0
var LOOK_DOWN_LIMIT = -PI/2
var LOOK_UP_LIMIT = PI/2
var paused = false

func _ready():
	DisplayServer.mouse_set_mode(DisplayServer.MOUSE_MODE_CAPTURED)

func _input(event):
	if event is InputEventMouseMotion and DisplayServer.mouse_get_mode() == DisplayServer.MOUSE_MODE_CAPTURED:
		# Rotate the camera up and down
		rotation.x = clamp(rotation.x - event.relative.y / (SENSITIVITY * 400.0), LOOK_DOWN_LIMIT, LOOK_UP_LIMIT)
		# Rotate the camera horizontally
		rotation.y -= event.relative.x / (SENSITIVITY * 400.0)
  
	# Assumes that you have an input action called "menu"
	if event.is_action_pressed("menu"):
		cycle_pause() # Frees the mouse to close the window or do other things

func cycle_pause():
	if paused:
		unpause()
	else:
		pause()

func pause():
	DisplayServer.mouse_set_mode(DisplayServer.MOUSE_MODE_VISIBLE)
	paused = true

func unpause():
	DisplayServer.mouse_set_mode(DisplayServer.MOUSE_MODE_CAPTURED)
	paused = false