Aligning sticky cubes

Questions & Answers
1

Hi!

I am trying to realize a Lego-like constructor. It will work with cubes with different materials. I made a prefab for a cube with this script:
using UnityEngine;
using System.Collections;

[RequireComponent(typeof(BoxCollider))]
[RequireComponent(typeof(Rigidbody))]
public class StickScript : MonoBehaviour
{
    private Rigidbody myRigid;    
    public void Start()
    {

        myRigid = gameObject.GetComponent<Rigidbody>();
    }

    public void OnCollisionEnter(Collision collision)
    {
        // all sticky objects have this tag
        if (collision.gameObject.tag != "Sticky")
            return;

        
        // if we are not connected to other object
        foreach (FixedJoint fj in collision.gameObject.GetComponents<FixedJoint>())
        {
            if (fj.connectedBody == myRigid)
                return;
        }

        var otherRigid = collision.gameObject.GetComponent<Rigidbody>();
        
        // if we didn't connected other object
        foreach (FixedJoint fj in gameObject.GetComponents<FixedJoint>())
        {
            if (fj.connectedBody == otherRigid)
                return;
        }

        // Connecting

        collision.gameObject.transform.rotation = gameObject.transform.rotation;  // rotating
        var joint = gameObject.AddComponent<FixedJoint>();
        joint.connectedBody = collision.rigidbody;


    }
}

I am rotating the cubes, so they aligned properly… But i didn’t understand how to make cubes to stick aligned: cubes must be connected by edges. Without this, I am getting this:

67783-bug1.png
67783-bug1.png704×304 16.1 KB

Can you help me with the position transformation when sticking?

With best regards

P. S. The mechanism of connecting: I am moving this blocks by using Leap Motion - they are rigidbodies, so I can move them by hands

2

What exactly is the mechanism for deciding what to connect? Are you dragging and object or moving an object into another? Trying to understand what brings them to each other and the state they are in when you try to “stick” them