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Question by $$anonymous$$ · Jul 28, 2013 at 11:33 AM · c#rotationrotatelookatnull

Object isnt rotating when moving towards an object

So i want 2d plane to move towards another plane and rotate it, but its rotating only when object is null. Thanks.

      void Update () 
     {
         transform.Rotate(0, 2, 0);
         player = GameObject.FindGameObjectWithTag("Player");
         if(player !=null)
         {
             
         transform.LookAt(player.transform.position,Vector3.forward);
         transform.Translate(Vector3.forward * Time.deltaTime * speed);
         
         }
     }
     
 
 
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Answer by dan19 · Jul 28, 2013 at 01:54 PM

This is because Transform.LookAt() is quite different from Transform.Translate() and Transform.Rotate().

Rotate() and Translate() are sort of incremental. They take the existing coordinate system and modify it a little bit.

LookAt(), on the other hand, is not incremental at all, it is absolute. It completely disregards the previous rotation of the coordinate system, and sets it anew. So LookAt() after Rotate() completely destroys what Rotate() did.

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avatar image $$anonymous$$ · Jul 28, 2013 at 02:05 PM 0
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so what do you suggest?

avatar image dan19 · Jul 28, 2013 at 02:10 PM 0
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It depends on what exactly you want to get. One way is like this: don't call LookAt() in every Update(). Call it once when you want to start the movement (maybe in Start()).

avatar image $$anonymous$$ · Jul 28, 2013 at 02:13 PM 0
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You are right, but i need object always go to an anther object and rotate, maybe there is another way to do this?

avatar image dan19 · Jul 28, 2013 at 02:16 PM 0
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You can also move your Rotate() method, and make the rotation not incremental (2 degrees per frame in your case), but absolute. Something along these lines:

 transform.LookAt(player.transform.position, Vector3.forward);
 transform.Translate(Vector3.forward * Time.deltaTime * speed);
 transform.Rotate(0.0f, Time.time * rotationSpeed, 0.0f);
avatar image $$anonymous$$ · Jul 28, 2013 at 02:28 PM 0
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It works :)

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