godot_first_person_shooter.gd

#
# Author: @November_Dev
#
# This class is a straightforward, zero overhead implementation of
# very basic FPS controls.
#
# Ideal node setup:
#	KinematicBody
#		|- Camera
#
extends KinematicBody

# horizontal rotation (y)
var yaw = 0
# vertical rotation (x)
var pitch = 0

# listen to every input 
func _input(event):
	# filter events for mouse movement
	if event is InputEventMouseMotion:
		# float modulus the angle difference, 
		# so that 360%360==0 and 90%360==90
		# to prevent angles above 360 degrees
		yaw = fmod(yaw - event.relative.x, 360)
		# do the same, but clamp it at 70 and -70
		pitch = max(min(pitch - event.relative.y, 70), -70)
		
		# set rotation of the player
		rotation_degrees.y = yaw
		# set rotation of the camera
		$Camera.rotation_degrees.x = pitch

# prepare the variables
func _ready():
	pitch = rotation_degrees.x
	yaw = $Camera.rotation_degrees.y

# execute every frame
func _physics_process(delta):
	# movement direction
	var direction = Vector3()
	
	# get a key
	if Input.is_key_pressed(KEY_W):
		# basis.z is the current forward vector
		direction -= global_transform.basis.z
	if Input.is_key_pressed(KEY_S):
		direction += global_transform.basis.z
	if Input.is_key_pressed(KEY_A):
		# basis.x is the current.left vector
		direction -= global_transform.basis.x
	if Input.is_key_pressed(KEY_D):
		direction += global_transform.basis.x
	
	# apply movement towards the direction
	move_and_slide(direction * 200.0 * delta)