Hi,How to use the LayerMask in the Raycast function?

Unity Engine
1

hello all,I’m learning the Raycast function.
I will create a scene:These objects(box01,box02,box03_noColliedr) in the object(ColliderBase),I just want to access to objects(box01,box02,box03_noCollider).But I set the LayerMask into any value,I don’t access to those objects(box01,box02,box03_noCollider):shock:,Why is this?

using UnityEngine;
using System.Collections;

public class Ray02 : MonoBehaviour
{

    GameObject Text01;

    Ray sy01;
    RaycastHit sy_Hit01;

    public int MyLayerMask = 0;

    // Use this for initialization
    void Start()
    {

        Text01 = GameObject.Find("Text01");

    }


    void Update()
    {



        sy01 = camera.ScreenPointToRay(Input.mousePosition);
        if (Physics.Raycast(sy01, out sy_Hit01, 1000f, MyLayerMask)  Input.GetMouseButtonDown(0)) 
        {

            Text01.guiText.text = sy_Hit01.transform.name.ToString();
        }

    }
}

419062–14537–$Ray_and_Collider.unitypackage (5.32 KB)

2

You set MyLayerMask to zero, which means all layers are masked off. Try:

MyLayerMask = 1 << LayerMask.NameToLayer("My Layer Name");

NameToLayer() returns the layer index; ‘1 << …’ converts that to a bit mask, turning on the bit associated with that layer. To select more than one layer to raycast against, use

 MyLayerMask = (1 << LayerMask.NameToLayer("My Layer Name"))
             (1 << LayerMask.NameToLayer("My Other Layer Name"));
3

Thank you
I try…

4

but,If I use the “MyLayerMask = (1 << LayerMask.NameToLayer(“My Layer Name”)) (1 << LayerMask.NameToLayer(“My Other Layer Name”));”,unity will prompt error: error CS0019: Operator ' cannot be applied to operands of type int’ and `int’

using UnityEngine;
using System.Collections;

public class Ray02 : MonoBehaviour
{

    GameObject Text01;

    Ray sy01;
    RaycastHit sy_Hit01;


    public string MyLayerMaskName = "Anchor";

    public string OtherLayerMaskName = "NoAnchor";

    public int MyLayerMask = 1;

    



    // Use this for initialization
    void Start()
    {

        Text01 = GameObject.Find("Text01");

        MyLayerMask = (1 << LayerMask.NameToLayer(MyLayerMaskName))  (1 << LayerMask.NameToLayer(OtherLayerMaskName));
        

    }


    void Update()
    {

        MyLayerMask = (1 << LayerMask.NameToLayer(MyLayerMaskName))  (1 << LayerMask.NameToLayer(OtherLayerMaskName));


        sy01 = camera.ScreenPointToRay(Input.mousePosition);

        if (Physics.Raycast(sy01, out sy_Hit01, 1000f,MyLayerMask )  Input.GetMouseButtonDown(0)) 
        {

            Text01.guiText.text = sy_Hit01.transform.name.ToString();
        }

    }
}
1 Like
5

Needs to be a single , not two ()

is true if the left side and the right side are true
is the bit-operator AND.

Also I think you need to use Vertical Bar ( | ) instead - bitwise OR. That adds two layer masks together, while bitwise-AND only tells you which layers those masks have in common.

You can also declare a LayerMask variable that can be easily edited in the Inspector.

6

This is be can.but no look “My Layer Name” and “My Other Layer Name” …

any case, or would like to thank you and laurie very much
thank very much…:):):slight_smile: