Answer by diegzumillo

You need to use Vector2 as arguments for the Physics2D.Linecast. I made the same mistake when migrating to 2D physics :P Something like var MyPos : Vector2 = Vector2(transform.position.x, transform.position.y); var GroundCheckPos : Vector2 = Vector2(groundCheck.position.x, groundCheck.position.y); Physics2D.Linecast(MyPos , GroundCheckPos , 1 << LayerMask.NameToLayer("Ground"));