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Question by Rick74 · May 22, 2014 at 09:53 PM · javascriptmovetowardswhile loop

MoveTowards not moving towards! lol.

Can someone do a check on this and see if this works on their end? It seems right to me, and the strange part is that the print statement is firing off every time the while statement loops, yet the object "tractor" will not move!

 function StartTractor ()
 {
     //find the z value by searching through spawner array and comparring y value 
     var findZ:    float;
         
     for (var spawner : Transform in alienSpawnPoints)
     {
         if (spawner.localPosition.y == targetObjectRow)
         {
             findZ = spawner.position.z;
         }
     }
     // sets up the starting position for tractor
     var startPosition     = Vector3(-8.6, targetObjectRow, findZ);
     var endPosition        = Vector3(9.6, targetObjectRow, findZ);
     var step             = 5;
     Instantiate (tractor, startPosition, Quaternion.identity);
     
     while (tractor.transform.position != endPosition)
     {
         tractor.transform.position = Vector3.MoveTowards(tractor.transform.position, endPosition, step * Time.deltaTime);
         print ("in here");
         yield;
     }
     
     Destroy(tractor);
 }

Anyone have any theories why the print fires off, yet the object will not move to it's end goal?

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avatar image Rick74 · May 22, 2014 at 10:07 PM 0
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I've checked and rechecked. startPosition is (-8.6, 2.1, 5.0) endPosition is ( 9.6, 2.1, 5.0). So it really should be simply travelling a straight line to get from start to end. This blows my brain!

avatar image Jeff-Kesselman · May 22, 2014 at 10:31 PM 0
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Why would it move towards lol?

(Hint, "loling" at yourself in your messages is very unprofessional. It reads like a child wrote it. Even if you ARE a child, you don't want to read that way.)

avatar image Rick74 · May 24, 2014 at 02:59 PM 0
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Jeff, let's take a step back here and look at this whole picture;

You have just posted in a question, that had already been answered, to insult the person asking the question...

While at the same time, offering no insight regarding the question.

Think about that, and then ask yourself, who comes across as a "child"?

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Answer by rutter · May 22, 2014 at 10:07 PM

You may want two separate variables: tractor and tractorPrefab.

 tractor = Instantiate(tractorPrefab, startPosition, Quaternion.identity);

Point being, Instantiate returns a reference to the clone. Since you don't save that reference anywhere, you effectively lose track of the newly cloned tractor just as soon as you create it.

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avatar image Rick74 · May 22, 2014 at 10:14 PM 1
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Holy mary mother of god. That worked instantly. I would never have figured that out. $$anonymous$$ake sense though, now that I think about it.

thanks rutter!

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