godot/demos/3d/truck_town/follow_camera.gd

extends Camera

# Member variables
var collision_exception = []
export var min_distance = 0.5
export var max_distance = 4.0
export var angle_v_adjust = 0.0
export var autoturn_ray_aperture = 25
export var autoturn_speed = 50
var max_height = 2.0
var min_height = 0


func _fixed_process(dt):
	var target = get_parent().get_global_transform().origin
	var pos = get_global_transform().origin
	var up = Vector3(0, 1, 0)
	
	var delta = pos - target
	
	# Regular delta follow
	
	# Check ranges
	if (delta.length() < min_distance):
		delta = delta.normalized()*min_distance
	elif (delta.length() > max_distance):
		delta = delta.normalized()*max_distance
	
	# Check upper and lower height
	if ( delta.y > max_height):
		delta.y = max_height
	if ( delta.y < min_height):
		delta.y = min_height
	
	pos = target + delta
	
	look_at_from_pos(pos, target, up)
	
	# Turn a little up or down
	var t = get_transform()
	t.basis = Matrix3(t.basis[0], deg2rad(angle_v_adjust))*t.basis
	set_transform(t)


func _ready():
	# Find collision exceptions for ray
	var node = self
	while(node):
		if (node extends RigidBody):
			collision_exception.append(node.get_rid())
			break
		else:
			node = node.get_parent()
	set_fixed_process(true)
	# This detaches the camera transform from the parent spatial node
	set_as_toplevel(true)