Hi! i need to detect the ground with a raycast to activate the falling animation, i use this code, but not work, the code detect the ground all time. Thanks! 
public class Player : MonoBehaviour
{
public float distanceGround;
public bool isGrounded = false;
void Start()
{
distanceGround = GetComponent<Collider2D>().bounds.extents.y;
}
void FixedUpdate()
{
//Movement
rb2d.MovePosition(rb2d.position + mov * speed * Time.deltaTime);
//Falling raycast
if (!Physics2D.Raycast(transform.position, -Vector2.up, + 0.1f))
{
isGrounded = false;
print("air");
}
else
{
isGrounded = true;
print("ground");
}
