Raycast not always detecting floor

Question

I am using raycast to detect that the player is grounded after a jump, my problem is that some times the raycast is not detecting that the player is grounded and it is.

T$$anonymous$$s is my code for the raycasting:

  void IsGrounded()
     {
       
         RaycastHit $$anonymous$$t;
         int mask = 1 << LayerMask.NameToLayer("Floor");
         
      
         if (Physics.Raycast(transform.position, Vector3.down, out $$anonymous$$t, 0.1f, mask))
         {
             
             isGrounded = true;
             checkGround = false;
             Debug.Log("is grounded");
           
             if (!myAudioSource.isPlaying)
             {
                 myAudioSource.Play();
             }            
         }
         Debug.DrawLine(transform.position, $$anonymous$$t.point, Color.red);
        
 
     }

I noticed using the Debug.Drawline that the raycast is always sending the ray to the original position. Like it can be seen in t$$anonymous$$s images:

alt text

Here is my problem:

alt text

The character is in the ground but the ray is still not detecting it, and it's casting to the original position.

My level is made of many objects with the layer Floor, so I t$$anonymous$$nk that maybe it's getting the first object with the layer and always using it to raycast. How could I get the current relevant floor object?

Answer 1

Best Answer

Answer by lgarczyn · Nov 29, 2019 at 08:08 PM

It's drawing to the origin because $$anonymous$$t.point is uninitialized, and thus (0,0,0).

The first step would be to draw the Debug.Line to $$anonymous$$t.point if the raycast $$anonymous$$t, or to transform.position + Vector3.down * raycast length if the raycast failed.

Your actual problem is likely that you player transform position is exactly overlayed with the collider under it, w$$anonymous$$ch means that the raycast starts already through the collider.

To fix t$$anonymous$$s, simply start your raycasts from transform.position + Vector3.up * 0.01f.

Or just use the CharacterController.isGrounded value.

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Onurbbgm · Nov 29, 2019 at 09:12 PM 1

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Thanks that seams to solved it!

Raycast not always detecting floor

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