Smoother movement and jumping with rigidbodies

Questions & Answers
1

I keep trying to make smoother movement and jumping with a rigidbody but wither the jumping stops working or the movement isn’t smooth. And the charactercontroller is not working like I want it to.

    private Vector3 move;
    public float velY, gravity, jumpSpeed;
    public BoxCollider col;
    public float speed;

    public Rigidbody playerR;
    public static bool jumped;
    public Joystick joystick;

    public void Start()
    {
        jumpSpeed = 7;
        gravity = 7;
        speed = 4;
        velY = 5;
    }

    void Update()
    {

        if (IsGrounded())
        {
            velY -= gravity * Time.deltaTime;
        }

        Vector3 move = Vector3.zero;
        move.x = Input.GetAxisRaw("Horizontal") * speed;
        move.y = velY;
        move.z = Input.GetAxisRaw("Vertical") * speed;

        if (joystick.InputDirection != Vector3.zero)
        {
            move.x = joystick.InputDirection.x * speed;
            move.z = joystick.InputDirection.z * speed;
            move.y = 0;
        }

        playerR.velocity = move;

    }

    public bool IsGrounded()
    {
        int layerMask = LayerMask.GetMask("Platform");
        return Physics.CheckBox(col.bounds.center, new Vector3(col.bounds.center.x, col.bounds.min.y, col.bounds.center.z), col.transform.rotation, layerMask);
    }
2

If you want smoother movement then its best to let Unity handle velocity. Rather than setting the velocity just add force.

Rigidbody rb;

public float jumpStrength;

void Start () {
	rb = GetComponent<Rigidbody>();
}

void LateUpdate () {
	// Handle the movement
	HandleMovement();
	
	// Handle Jumping
	HandleJump();
}

void HandleMovement () {

	// Get the movement vector
	Vector3 move = new Vector3 (Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));
	move *= speed * Time.DeltaTime;
	
	// Use ForceMode to make it smoother
	// Force is the default but you can also try
	// Acceleration & VelocityChange a bit more sharper movement
	// We must also ensure that we don't add force to exceed max velocity/speed	
	var movementPlane = new Vector3 (rb.velocity.x, 0, rb.velocity.z);
	if (movementPlane.magnitude < speed)
		rb.AddForce(move, ForceMode.Force);
	
}

void HandleJump () {
	
	// For jumping we do something similar with force
	// However we want it instant so we can use the Impulse force mode
	if (Grounded()){
		rb.AddForce(new Vector3 (0, jumpStrength, 0), ForceMode.Impulse);
	}
}