how do i make that only triggers a specific object

I assume your question is : " How can I make sure that an event will only be triggered through a certain GameObject?"

public string tagToCompare = "Player";

void OnTriggerEnter( Collider col ) { if( col.transform.tag == tagToCompare){ DoSomething..... } }

instead of (col.transform.tag.....) you could also use if(col.transform.CompareTag(tagToCompare)) the second solution will be true if the collider object has the specified tag.

Make sure to give your "object" a collider and a tag. Further set tagToCompare equal to the object's tag.

This solution hopefully :) works for C# .

However, here is the link to the API :

http://docs.unity3d.com/Documentation/ScriptReference/Collider.OnTriggerEnter.html

I hope I could help, best wishes .

Daniel