Draw a line between 2 objects chosen in game

Hello,
I'm trying to draw a line between 2 game objects.
The problem is that I want the user to choose the 2 game objects while in game.

My approach was:
Put custom script on prefab parent

on prefab Child 1:
Activate script using SelectEntered (or Activated)

on prefab Child2:
Activate script using SelectEntered (or Activated)

And the code I thought of:

Code (CSharp):

1. public class MakeLine2Parts : MonoBehaviour
2. {
3.     private LineRenderer line;
4.     [SerializeField] Material Material;
5.     [SerializeField] float lineWidth;
6.     void Start()
7.     {
8.         // Add a Line Renderer to the GameObject
9.         line = this.gameObject.AddComponent<LineRenderer>();
10.         // Set the width of the Line Renderer
11.         line.startWidth = lineWidth;
12.         // Set the number of vertex fo the Line Renderer
13.         line.positionCount = 2;
14.     }
15.  
16.     public void ObjectSelection()
17.     {
18.         if (true)
19.         {
20.             line.SetPosition(0, this.gameObject.transform.position);
21.         }
22.         else
23.         {
24.             line.SetPosition(1, this.gameObject.transform.position);
25.         }
26.     }
27. }

However I have no idea what conditions I should set for if/else.
gameObject != null sounded right in my head but then how do I dynamically fill that with whatever gameObjects the user choose?

For context the environment is:
Child1 and Child2 always in scene
There is a button a user can press to instantiate/spawn Child(x)

The flow would be:
User spawns x number of Children -> selected ChildX -> select ChildY -> a line is drawn.

I hope you'll be able to help me
Thank you!
(I'm new to coding and started using Unity about a month ago! Sorry if this is a stupid question )

 

You would need to feed those GameObjects that the user selects into this script, which would then take their positions out of the Transform component on the GameObject.

Remember, .gameObject is a shortcut to the GameObject that THIS script here is located on.

 

Hey @Kurt-Dekker thanks so much for the quick reply!
Any hint on how I'd go for "feeding the GameObjects that the user selected into this script"?

 

I would make a method on the line positioning script that accepts the two new pieces of data from whatever script you are using to "pick the two pieces."

- If they accept the position, it will be frozen in time at that moment (Vector3 is a value type)

- if they accept the transform, they can look in the transform to get the up-to-date position at any time.

Either approach may suit you, or it might be you want one particular way or another.

For stuff to help you clicking on things and selecting them, look to Youtube tutorials. Remember it has to be stateful and wait until you have 2 selected to send it over.