My Raycast dont hit.

Questions & Answers
1

Hi there.

I try to make a simple Basic AI, that approaches a Target, and turn around if its near enougth, but all it do is approach the Target, until it is in it, and start rotate.

Thats what i got until now.

public float spacetotarget;
private GameObject target;

//approach Target
		
		if(Physics.Raycast(transform.position,target.transform.position,spacetotarget,10)){
			Debug.Log("zunah");
			targetrotation = Quaternion.Inverse(Quaternion.LookRotation(target.transform.position - transform.position));
		}
			
		else{
			targetrotation = Quaternion.LookRotation(target.transform.position - transform.position);	
		}

The Debug.Log dont show up.
The Target has a Collider and the Layer 10.

2

You have several mistakes here:

  • Raycast uses a position from where to start and a direction vector. However you used a position as direction.
  • The layermask parameter is a bitmask and not a layer index. You effectively are casting against layer 1 (value 2) and layer 3 (value 8).

To fix this you could use a Linecast instead of a Raycast which takes two positions instead of a position and a direction.

When using a Raycast you should calculate the direction vector to your target by calculating

    target.transform.position - transform.position

To get a layermask that only has layer 10 in it (start counting by 0) just use

    2^10

or precalculate the value which equals:

    1024

Here’s a woring example:

    Vector3 dir = target.transform.position - transform.position;
    int layermask = 2^10;
    if(Physics.Raycast(transform.position, dir, spacetotarget, layermask))
3

Find a Way:

the declaration of the Layermask is a bit tricky.

		int targetlayer = 10;
		targetlayer = ~targetlayer;
		Vector3 direction = target.transform.position-transform.position;
		if(Physics.Raycast(transform.position,direction,spacetotarget,targetlayer)){
			targetrotation = Quaternion.Inverse(Quaternion.LookRotation(target.transform.position - transform.position));
		}
			
		else{
			targetrotation = Quaternion.LookRotation(target.transform.position - transform.position);	
		}
4

This is the way I go with layers …