Godot Doom Sprite 3D Script

extends KinematicBody

export var anim_col = 0
export var speed = 7
export var gravity = 20
const ACCEL_DEFAULT = 7
const ACCEL_AIR = 1
onready var accel = ACCEL_DEFAULT

var direction = Vector3()
var velocity = Vector3()
var gravity_vec = Vector3()
var movement = Vector3()
var snap
var jump = 10

onready var sprite = $Sprite3D
onready var ani_player = $AnimationPlayer

var camera = null

func _ready():
    add_to_group("Imps")
    ani_player.play("anim_col")

func _physics_process(delta):
    follow_camera()
    jump(delta)
    move(delta)

func set_camera(c):
    camera = c

func follow_camera():
    if camera == null:
        return

    var p_fwd = -camera.global_transform.basis.z
    var fwd = global_transform.basis.z
    var left = global_transform.basis.x

    var l_dot = left.dot(p_fwd)
    var f_dot = fwd.dot(p_fwd)
    var row = 0
    sprite.flip_h = false
    if f_dot < -8.5:
        row = 0 # front sprite
    elif f_dot > 8.5:
        row = 4 # back sprite
    else:
        sprite.flip_h = l_dot > 0
        if abs(f_dot) < 0.3:
            row = 2 # left sprite
        elif f_dot < 0:
            row = 1 # forward left sprite
        else:
            row = 3 # back left sprite
    sprite.frame = anim_col + row * 4

func jump(delta):
    #jumping and gravity
    if is_on_floor():
        snap = -get_floor_normal()
        accel = ACCEL_DEFAULT
        gravity_vec = Vector3.ZERO
    else:
        snap = Vector3.DOWN
        accel = ACCEL_AIR
        gravity_vec += Vector3.DOWN * gravity * delta

    #if Input.is_action_just_pressed("jump") and is_on_floor():
    #   snap = Vector3.ZERO
    #   gravity_vec = Vector3.UP * jump

func move(delta):
    #make it move
    velocity = velocity.linear_interpolate(direction * speed, accel * delta)
    movement = velocity + gravity_vec

    move_and_slide_with_snap(movement, snap, Vector3.UP)