Shake 3D camera script (Godot Engine 2.1)

I've fixed this shake 2d camera script for 3d camera to use it in 3d games.

	# usage example:
	# curr_camera.shake(0.25, 40, 0.2)
	extends Camera
	var duration = 0.0
	var period_in_ms = 0.0
	var amplitude = 0.0
	var timer = 0.0
	var last_shook_timer = 0
	var prev_x = 0.0
	var prev_y = 0.0
	var prev_z = 0.0
	var last_offset = Vector3(0,0,0)
	var original_translation = Vector3()
	func _ready():
	original_translation = get_translation()
	func _process(delta):
	if timer == 0:
	set_translation(original_translation)
	set_process(false)
	return
	last_shook_timer = last_shook_timer + delta
	while last_shook_timer >= period_in_ms:
	last_shook_timer = last_shook_timer - period_in_ms
	# Lerp between [amplitude] and 0.0 intensity based on remaining shake time.
	var intensity = amplitude * (1 - ((duration - timer) / duration))
	# Noise calculation logic from http://jonny.morrill.me/blog/view/14
	var new_x = rand_range(-1.0, 1.0)
	var x_offset = intensity * (prev_x + (delta * (new_x - prev_x)))
	var new_y = rand_range(-1.0, 1.0)
	var y_offset = intensity * (prev_y + (delta * (new_y - prev_y)))
	var new_z = rand_range(-1.0, 1.0)
	var z_offset = intensity * (prev_z + (delta * (new_z - prev_z)))
	prev_x = new_x
	prev_y = new_y
	prev_z = new_z
	# Track how much we've moved the offset, as opposed to other effects.
	var new_offset = Vector3(x_offset, y_offset, z_offset)
	#set_offset(get_offset() - _last_offset + new_offset)
	set_translation(get_translation() - last_offset + new_offset)
	last_offset = new_offset
	# Reset the offset when we're done shaking.
	timer = timer - delta
	if timer <= 0:
	timer = 0
	set_translation(get_translation() - last_offset)
	func shake(duration, frequency, amplitude):
	# Don't interrupt current shake duration
	if(timer != 0): return
	randomize()
	self.duration = duration
	timer = duration
	period_in_ms = 1.0 / frequency
	self.amplitude = amplitude
	prev_x = rand_range(-1.0, 1.0)
	prev_y = rand_range(-1.0, 1.0)
	last_offset = Vector3(0, 0, 0)
	set_translation(original_translation)
	set_process(true)

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