How to rotate Character Mesh smoothly?

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:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By jon4short

Hi There,
In my 3D project, I want to move the character around just with WASD like in Overcooked and Animal Crossing. This is the script I have so far. But the character rotation just jumps to each direction instead of turning smoothly.

extends KinematicBody

var gravity = -9.8
var velocity = Vector3()
var camera
var character

const SPEED = 6
const ACCELERATION = 3
const DECEL = 5

func _ready():
	camera = get_node("../Camera").get_global_transform()
	character = get_node(".")
	
#func _process(delta):

func _physics_process(delta):
	var dir = Vector3()
	
	var is_moving = false
	
	if(Input.is_action_pressed("move_forward")):
		dir += -camera.basis[2]
		is_moving = true
	if(Input.is_action_pressed("move_back")):
		dir += camera.basis[2]
		is_moving = true
	if(Input.is_action_pressed("strafe_left")):
		dir += -camera.basis[0]
		is_moving = true
	if(Input.is_action_pressed("strafe_right")):
		dir += camera.basis[0]
		is_moving = true
	
	dir.y = 0
	dir = dir.normalized()
	
	velocity.y += delta * gravity
	
	var hv = velocity
	hv.y = 0
	
	var new_pos = dir * SPEED
	var accel = DECEL
	
	if (dir.dot(hv) > 0):
		accel = ACCELERATION
		
	hv = hv.linear_interpolate(new_pos, accel * delta)
	
	velocity.x = hv.x
	velocity.z = hv.z
	
	velocity = move_and_slide(velocity, Vector3(0,1,0))
	
	if is_moving:
		
		# Rotates the player to direction moving
		var angle = -atan2(hv.x, -hv.z)
		
		var char_rot = character.get_rotation()
		char_rot.y = angle
		character.set_rotation(char_rot)