How to rotate a cylinder on the mouse position ?

Question

Hello

I'm trying to rotate a cylinder but I have some issues. I want that my cylinder rotate in the direction of my mouse position .

I tried some math algorythm like this :

 Vector2 _point;
 _point = new Vector2(transform.position.x, \ 
 this.renderer.bounds.size.y/2 + transform.position.y);
 Vector3 mousePos = Input.mousePosition;
 mousePos = Camera.main.ScreenToWorldPoint(mousePos);

     
 Vector2 AB = new Vector2(_point.x - transform.position.x, _point.y - \
 transform.position.y);

 Vector2 AC = new Vector2(mousePos.x - transform.position.x, mousePos.y - \
 transform.position.y);

 Vector2 BC = new Vector2(mousePos.x - _point.x, mousePos.y - _point.y);
     
     
 float dAB =  Mathf.Sqrt(Mathf.Pow(AB.x,2) + Mathf.Pow(AB.y,2));
 float dAC =  Mathf.Sqrt(Mathf.Pow(AC.x, 2) + Mathf.Pow(AC.y,2));
 float dBC =  Mathf.Sqrt(Mathf.Pow(BC.x, 2) + Mathf.Pow(BC.y,2));
     
 float toCos = ((AB.x * AC.x) + (AB.y * AC.y))/(dAB *dAC);
  float _angle = Mathf.Acos(toCos) * Mathf.Rad2Deg;


 this.Rotate(0,0,_angle);
 _point = new Vector2(mousePos.x, mousePos.y);

It seems to work with the first click but not after. Is there something wrong with my math algorythm ? Or it with my use of unity object ?

Answer 1

Best Answer

Answer by Cherno · Nov 08, 2013 at 02:23 PM

You could just store the Vector3 the mouse is pointing at (by using RayCast) and then use Transform.LookAt.

http://docs.unity3d.com/Documentation/ScriptReference/Transform.LookAt.html

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sdgd · Nov 08, 2013 at 02:25 PM 0

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but that will rorate whole cilinder not just X axis, ...

I was doing something like that, ...

and I won't do much recoding just copy paste learn what you can, ...

 public void DontLookAtYF(Vector3 Point){
     Vector3 Temp = transform.localEulerAngles;
     transform.LookAt(Point);
     Temp.y = transform.localEulerAngles.y;
     transform.localEulerAngles = Temp;
 }

thanks to @Cherno I get the idea what questioner exactly wants, ...

kavaliero · Nov 08, 2013 at 02:59 PM 0

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Thank you, it works fine . It's been two days that i'm on it .

How to rotate a cylinder on the mouse position ?

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