void Update()
    {
        if (controller.isGrounded)
        {
            if(Input.GetKey(KeyCode.W))
            {
                anim.SetInteger("condition", 1);
                moveDir = new Vector3(0, 0, 1);
                moveDir *=  speed;
                moveDir = transform.TransformDirection(moveDir);
            }
            else
            {
                anim.SetInteger("condition", 0);
                moveDir = new Vector3(0, 0, 0);
            }
        }
        rot += Input.GetAxis("Horizontal")*rotSpeed * Time.deltaTime;
        transform.eulerAngles = new Vector3(0, rot, 0);

        moveDir.y -= gravity * Time.deltaTime;
        controller.Move(moveDir * Time.deltaTime);
    }
}