Collision Buttons?

Unity Engine
1

I am working on a collision-based button script (is there any other kind?), and I am trying to work out how to use smooth transitions in the animation, sort of like a fade between the two, otherwide if i enter and exit then enter quickly, the animation playing jumps to the ontriggerenter animation instead of smoothly transitioning between.

Here is the code:

var door : GameObject;

//var linkage : GameObject;

var soundClipButton : AudioClip;
//var soundDoorOpen : AudioClip;
//var soundDoorClose : AudioClip;

var Open : boolean = false;

function Start () {

    Open = false;

}

function OnTriggerEnter (other : Collider)
{
    if (!Open)
    {
        door.animation.Play("Open");
        animation.Play("down animation");
        audio.PlayOneShot(soundClipButton);
    }
}

function OnTriggerExit (other : Collider)
{
    if (Open)
    {
        door.animation.Play("Close");
        animation.Play("up animation");
        audio.PlayOneShot(soundClipButton);
    }
}
2
3

You can use this to wait until one Animation finishes playing.

if (!door.gameObject.animation.isPlaying)
{
     //Play animation part.
}

Use this in both Trigger enter and exit so both will wait until any other anims stop playing.