Check if 2D Player is grounded with Physics2D.Linecast

Questions & Answers
1

Hi, mates,

I’m feeling a bit desperate because last 2 hours I’ve spent searching for a solution, but didn’t succeed.
I tried to develop an easy script to check if the Player isGrounded.
But the problem is that when I run the project my player is “floating” in the air, like no gravity is applied. (Rigidbody2D is attached)
###upd:
I’ve increased the Gravity Scale of the player, so he finally landed, but the script still does not set grounded = true, i guess the problem is in the Physics.Linecast()

Code where I try using the Linecast function never sets grounded or jump to true

   void Update()
   { 
    myMaskLayer = 1 << LayerMask.NameToLayer("Ground");

   	grounded = Physics2D.Linecast(transform.position, groundCheck.position, myMaskLayer); 
    
    if(Input.GetButtonDown("Jump") && grounded){
    	jump = true;
   	}
   }

A screenshot with configurations from Unity
[22492-testlevel.unity±+pixeljourney±+pc,+mac+&+linux+standalone+2014-02-20+21-12-03.jpg|22492]

#Thank you!

2

I’m not sure what is groundCheck in your scene, but maybe my code will help:

hitDown = Physics2D.Linecast(transform.position, new Vector2(transform.position.x, transform.position.y - 25), 1 << 9);

distanceDown = Mathf.Abs(hitDown.point.y - transform.position.y); if(distanceDown > (boxCollider.size.y/2)) { inAir = true; } else { inAir = false; }

Here is casting line 25 units down, calculating a distance, and if the distance is larger than the height of BoxCollider2D attached to player than that means we are in air (or grounded = false in your case).

P.S. comparing with half of collider works better if collider is in center of object. In other cases you can get needed value with debuging distance.