CODEWITHSUNDEEP
c#raycastingunity-game-engine
sparpo
sparpo

Reputation: 109

How to make raycast ignore Trigger colliders?

I have a function that checks if a game object can see another game object without anything blocking its view:

public bool CheckVision(GameObject target)
{
    RaycastHit2D ray = (Physics2D.Raycast(transform.position, target.transform.position - transform.position, m_VisionRange));
    if(ray.collider.name == target.name)
    {
        Debug.DrawRay(transform.position, target.transform.position - transform.position);
        return true;               
    }
    else
    {
        return false;
    }
}

The only problem is that I don't want it to collide with colliders with the "isTrigger" flag set; I want the raycast to just ignore them. Any ideas?

Upvotes: 3

Views: 14817

Answers (3)

Sohail Bukhari
Sohail Bukhari

Reputation: 254

To have your raycasts ignore all trigger colliders in 5.2 go to:

Edit > Project Settings > Physics > Uncheck "Queries Hit Triggers"

(If you're using an older version of Unity, the check box is called "Raycasts Hit Triggers")

Actually in version 5.2.0f3 it no longer says Raycasts... It now appears as: "Queries Hit Triggers" Uncheck if you want raycasts to pass through trigger colliders.

Upvotes: 7

Programmer
Programmer

Reputation: 125275

Layer mask operation is not required for this. You don't have to use layers if this is only to ignore Colliders marked as triggers. This operation is now built in with Unity 5.2 and above.

1.For 3D, pass QueryTriggerInteraction.Ignore to the Physics.Raycast function.

int layer = 1 << LayerMask.NameToLayer("Default");
Physics.Raycast(cameraRay, out hit, distance, layer, QueryTriggerInteraction.Ignore);

2.For 2D, set Physics2D.queriesHitTriggers to false if you don't want it to detect triggers. Set it to true when you want it to detect triggers once again. Make sure to set it before calling the Physics2D.Raycast function.

Don't detect triggers:

Physics2D.queriesHitTriggers = false;

Detect triggers:

Physics2D.queriesHitTriggers = true;

Your are looking for the 2D version.

Note:

I have seen reports of this not working on some certain version of Unity which is a bug but I assume it is now fixed. If not then use layers as described by l1sten.

Upvotes: 15

codename895431
codename895431

Reputation: 111

Change your triggered GameObjects layer on Ignore Raycast or use LayerMask https://docs.unity3d.com/ScriptReference/LayerMask.html

int targetLayer = 1 << LayerMask.NameToLayer("Target Layer");
public bool CheckVision(GameObject target)
{
    RaycastHit2D ray = (Physics2D.Raycast(transform.position, target.transform.position - transform.position, m_VisionRange, targetLayer ));
    if(ray.collider.name == target.name)
    {
        Debug.DrawRay(transform.position, target.transform.position - transform.position);
        return true;               
    }
    else
    {
        return false;
    }
}

Upvotes: 1

Related Questions