How can I compare Collider's layer to my LayerMask type variable?

[APProjects]

Hi!

I have a problem. I have a missile prefab, which instantiates an explosion prebab on destroy. The explosion has a sphere collider. The missiles must ignore the collider of the explosions. I figured out one way to do this, but maybe, I’ll need more to ignore later, not only the layer called “explosion”. So, I decided to read about LayerMasks and I tried to use them. I failed, and I don’t know, what is the problem.
Here is a working code, Layer #9 is “explosion”.

function OnTriggerEnter (other : Collider)
{
	if(other.gameObject.layer != 9)
	{
		Debug.Log("EXTERMINATE!");
		Explode();
	}
}

At the variable declaration part, I have a line:

var ignoreLayers : LayerMask;

I want to use this for check for more different layers. If the Collider’s layer is not what I selected, explode, otherwise do nothing.

Here is what I tried but didn’t work:

function OnTriggerEnter (other : Collider)
{
	if(other.gameObject.layer != ignoreLayers.value)
	{
		Debug.Log("EXTERMINATE!");
		Explode();
	}
}

If I select explosion layer, it does nothing, it still executes Explode() function and logs “EXTERMINATE”.

So, how to use LayerMask.value? I didn’t find solution yet.

[whydoidoit]

LayerMask is a bit flags field so to test it you do this:

   if(((1<<other.gameObject.layer) & includeLayers) != 0)
   {
       //It matched one
   }

   if(((1<<other.gameObject.layer) & ignoreLayers) == 0)
   {
        //It wasn't in an ignore layer
   }

[churi24]

This work for me…

    public LayerMask layerMask;

    private void OnCollisionEnter(Collision collision)
    {
        if ((layerMask & 1 << collision.gameObject.layer) == 1 << collision.gameObject.layer)
        {
                Explotar(true);
        }
    }

And if you have an Editor.cs

using UnityEditorInternal;

[CustomEditor(typeof(Misil))]
public class MisilEditor : Editor
{
 Misil misil;
    public override void OnInspectorGUI()
    {
        serializedObject.Update();
        misil= (Misil)target;
        LayerMask tempMask = EditorGUILayout.MaskField("Mask",InternalEditorUtility.LayerMaskToConcatenatedLayersMask(misil.layerMask), InternalEditorUtility.layers);
        misil.layerMask = InternalEditorUtility.ConcatenatedLayersMaskToLayerMask(tempMask);

}
}