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Question by TifaOng · Dec 11, 2013 at 03:57 AM · c#rotate object

Transform.rotate to mouse point

I have a mouse point, Vector3 Target and an object that rotates to the mouse down point. My object rotates on z axis only.

I tried

 Target = new Vector3 (0f, 0f, Target.z)
 Transform.Rotate (Target)

But on every mouse down, the object rotates clockwise, clockwise and clockwise. How do I make the object rotates to look at the mouse point directly?

Thanks in advance!

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Answer by hamstar · Dec 11, 2013 at 09:28 AM

Firstly you probably want to convert the mouse position to a world position. You can do this with `Camera.ScreenToWorldPoint`.

Transform.Rotate will rotate by a given angle, not towards a target. That's why it's always rotating one direction. `Vector3.RotateTowards` should do what you describe. You can pretty much copy the example from the documentation.

 public float speed;
 
 void Update() {
   if (Input.GetMouseButtonDown(0)) {
     Vector3 target = new Vector3(0, 0, Camera.main.ScreenToWorldPoint(Input.mousePosition).z);    
     Vector3 targetDir = target - transform.position;
     float step = speed * Time.deltaTime;
     Vector3 newDir = Vector3.RotateTowards(transform.forward, targetDir, step, 0.0F);
     transform.rotation = Quaternion.LookRotation(newDir);
   }
 }

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avatar image TifaOng · Dec 12, 2013 at 01:55 AM 0
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I used Quaternion.Euler, it works as well. Thanks!

avatar image hamstar · Dec 12, 2013 at 09:35 AM 0
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O$$anonymous$$, great.

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