I have the script below that works but it seems too big and unnecessary for the task. I have two rotating "sliding doors" that play with animation from .max file. I don't want to combine the doors to one because they use different materials that are repeated all over the project. I put two overlapping triggers to open them when you approach with the default first person controller.

The triggers are children of the parent animated object because I though that searching by tag or name will be slower. They play the animation with "gameObject.transform.parent...." is that a correct approach ? If I use one trigger I'll have to find the objects by tag and when you have many instances of these tags it seems that things are becoming a bit random on what door is opening. When I do the artwork (yes I am one of those ) I put an empty box called triggerXXX in my model and if I have multiple animations in one file I put multiple triggers as children. I do that because it is faster than snapping in unity and because I don't want to brake the connection with the original models which fills me with metaphysical fear !!! ... of assigning all the layers,the tags, the triggers and the materials again in a later stage. So as a strategy what is the most elegant way of assigning triggers that can work on multiple different objects?

//I duplicated my initial variables to triggerS and triggerT to avoid conflict//

private var triggerSActivated : boolean = false;
private var triggerTActivated : boolean = false;
private var timerS : float = 0.0;
private var timerT : float = 0.0;
private var triggerSObject : GameObject;
private var triggerTObject : GameObject;
var doorOpenSound : AudioClip;
var doorShutSound : AudioClip;


function OnTriggerEnter (hit:Collider){
     if((hit.gameObject.tag == "lifttrig_s") && (triggerSActivated == false)){
     triggerSObject=hit.gameObject ;
     print (triggerSObject.name);

    doorsS (doorOpenSound,"dooropen", triggerSObject,true);
    }

    if((hit.gameObject.tag == "lifttrig_t") && (triggerTActivated == false)){
     triggerTObject=hit.gameObject ;
     print (triggerTObject.name);

    doorsT (doorOpenSound,"dooropen", triggerTObject,true);
    }

    }
function Update()
{

    if(triggerSActivated) 

    {
        timerS += Time.deltaTime;
    }

    if(timerS >= 5)

    {
        doorsS(doorShutSound, "doorshuts", triggerSObject, false);      
         timerS = 0.0;  
    }

    if(triggerTActivated) 

    {
        timerT += Time.deltaTime;
    }

    if(timerT >= 5)

    {
        doorsT(doorShutSound, "doorshuts", triggerTObject, false);      
         timerT = 0.0;  
    }
}

function doorsT (aClip: AudioClip ,animName : String, aniTObject :GameObject,  triggerTCheck: boolean)
{
audio.PlayOneShot(aClip);
    triggerTActivated = triggerTCheck;

aniTObject.transform.parent.animation.Play(animName);
}

function doorsS (aClip: AudioClip ,animName : String, aniSObject :GameObject,  triggerSCheck: boolean)
{
audio.PlayOneShot(aClip);
    triggerSActivated = triggerSCheck;

aniSObject.transform.parent.animation.Play(animName);

  }
@script RequireComponent(AudioSource)