How to trigger a Moving Platform with a collider?

the most simplest solution i can think of is to make an animation so basically just animate it moving from the top to bottom and turn loop off and start on play off.

then put a script on a collider that says

 function OnCollisionEnter(col : Collision){
 if(col.gameObject == gameObject.Find("your character")){
 animation.Play();// if animation isnt on this then you will have to find it
 enabled = false;
 }
 }

You should use a different script to control the platform - MovingPlatform.js relies on the current Time.time to set the platform position, thus it can't be stopped. A good solution is to use a coroutine to do the job: once called, it runs in the background, moving the platform to the target point without any extra effort.
To control the movement, create a trigger volume: create a cube, child it to the platform, reset its position/rotation, then adjust its size and position to cover the platform. In the Inspector, set Is Trigger to make it a trigger, and clear the Mesh Renderer checkbox to make it invisible. Finally, add the script bellow to the trigger (not to the platform!):

var targetA : Transform; // drag here the empty game object that defines the start pos var targetB : Transform; // drag here the object that defines the end position var speed : float = 0.1; // speed (0.1 means 10s per movement)

private var curTarget: Transform;

function Start(){ // initialize platform at targetA position: curTarget = targetA; // set curTarget... // and move quickly the parent platform to its position (if not already there) MovePlatform(transform.parent, curTarget, 10); }

private var moving: boolean = false; // flag that warns when the platform is moving

function MovePlatform(platform: Transform, dest: Transform, vel: float){ moving = true; // set a flag to indicate "I'm moving" var from = platform.position; // get start position... var to = dest.position; // and end position... var t: float = 0; // initializes timer = 0 while (t < 1){ // cycle ends when timer reaches 1 t += Time.deltaTime vel; // advance timer at the desired speed... if (t > 1) t = 1; // and clamp it to 1 // then smooth it near to 0 and 1 with a cosine function: var weight = 0.5 (1 - Mathf.Cos(t * Mathf.Pi)); // set the platform position according to weight (0=from, 1=to) platform.transform.position = Vector3.Lerp(from, to, weight); yield WaitForFixedUpdate(); // let Unity free till the next fixed update } moving = false; // movement finished - clear the flag }

function OnTriggerEnter(other: Collider){ if (moving == false){ // if platform not already moving... if (curTarget == targetA){ // swap targets... curTarget = targetB; } else { curTarget = targetA; } // and move platform to the new target: MovePlatform(transform.parent, curTarget, speed); } } Use it like you were using MovingPlatform.js: drag to targetA and targetB the empty objects you've created to define the start and end positions. The platform starts at targetA position, and will move to targetB when any object enters its trigger volume. It will stand at targetB until any object enters the trigger again, what will make it go back to targetA position, and so on.