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Question by cuoilennaocacban · Oct 17, 2015 at 07:17 PM · positionquaternionrotatelinerenderer

Align game object base on 2 point

Maybe this is a dump question, but I just start in Unity, sorry.

I have 2 point on the world, both of them have position ( a vector3). Between them is a LineRenderer. LineRenderer only need 2 point to be draw on world.

 lr.SetPosition(0, vector3_0);
 lr.SetPosition(1, vector3_1);

I want to change the LineRender with a cube (or any game object). My try so far:

 //Test SampleCub
 sampleCube.transform.position = lr.transform.position;
 sampleCube.transform.rotation = Quaternion.LookRotation(vector3_0-vector3_1);

Not working. Please help. Thanks

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Answer by PictonicStudio · Oct 17, 2015 at 07:41 PM

     using UnityEngine;
     using System.Collections;
     
     public class LinePoints : MonoBehaviour
     {
         //set the number of points you your line to have in order
         public GameObject[] Points;
     
         private LineRenderer line;
     
         private void Start()
         {
             //Make sure you have a LineRenderer component attached to an empty gameobject
             line = GetComponent<LineRenderer>();
         }
         private void Update()
         {
             for (int i = 0; i < Points.Length; i++)
             {
                 //Sets Points
                 line.SetPosition(i, Points[i].transform.position);
             }
         }
     }

Here is a script I wrote that should work for you.

LineRenderers work by setting their positions in code by accessing their component

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avatar image cuoilennaocacban · Oct 18, 2015 at 03:08 AM 0
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Sorry I really don't understand what your code do. Is it just draw LineRenderer on the world?

avatar image cuoilennaocacban · Oct 18, 2015 at 03:44 AM 0
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Thanks. I found the solution here: http://answers.unity3d.com/questions/406248/need-help-to-get-3d-rotation-from-2-points-in-spac.html

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Answer by Azumiar · Oct 18, 2015 at 09:11 AM

You want to aling the position of a point with a position of an object so when you move an object the point will move aswell? If it is that then this code might help: In this case we will change second point

 public GameObject object;
  Vector3 point1; 
 Vector3 point2; 
 Vector3 objectPos; 
 Transform tr = object.GetComponent<Transform>();
  void update() { 
 point2 = tr.position;
 
 lr.SetPosition(0,point1); 
 lr.SetPosition(1, point2);
  }
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