Snap gameobject to closest gameobject.

SnapClosest.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SnapClosest : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        //Snap();
    }

    // Update is called once per frame
    void Update()
    {
        Snap();
    }

    void Snap()
    {
        if (Physics.Raycast(transform.position, -Vector3.right, out RaycastHit hitL, 1f))
        {
            var pos = hitL.transform.position + Vector3.right * (hitL.transform.GetComponent<MeshRenderer>().bounds.extents.x + transform.GetComponent<MeshRenderer>().bounds.extents.x);
            pos.y = transform.position.y;
            pos.z = transform.position.z;
            transform.position = pos;
        }

        if (Physics.Raycast(transform.position, Vector3.right, out RaycastHit hitR, 1f))
        {
            var pos = hitR.transform.position + (-Vector3.right) * (hitR.transform.GetComponent<MeshRenderer>().bounds.extents.x + transform.GetComponent<MeshRenderer>().bounds.extents.x);
            pos.y = transform.position.y;
            pos.z = transform.position.z;
            transform.position = pos;
        }

        if (Physics.Raycast(transform.position, -Vector3.up, out RaycastHit hitD, 1f))
        {
            var pos = hitD.transform.position + Vector3.up * (hitD.transform.GetComponent<MeshRenderer>().bounds.extents.y + transform.GetComponent<MeshRenderer>().bounds.extents.y);
            pos.x = transform.position.x;
            pos.z = transform.position.z;
            transform.position = pos;
        }

        if (Physics.Raycast(transform.position, Vector3.up, out RaycastHit hitU, 1f))
        {
            var pos = hitU.transform.position + (-Vector3.up) * (hitU.transform.GetComponent<MeshRenderer>().bounds.extents.y + transform.GetComponent<MeshRenderer>().bounds.extents.y);
            pos.x = transform.position.x;
            pos.z = transform.position.z;
            transform.position = pos;
        }

        if (Physics.Raycast(transform.position, -Vector3.forward, out RaycastHit hitF, 1f))
        {
            var pos = hitF.transform.position + Vector3.forward * (hitF.transform.GetComponent<MeshRenderer>().bounds.extents.z + transform.GetComponent<MeshRenderer>().bounds.extents.z);
            pos.x = transform.position.x;
            pos.y = transform.position.y;
            transform.position = pos;
        }

        if (Physics.Raycast(transform.position, Vector3.forward, out RaycastHit hitB, 1f))
        {
            var pos = hitB.transform.position + (-Vector3.forward) * (hitB.transform.GetComponent<MeshRenderer>().bounds.extents.z + transform.GetComponent<MeshRenderer>().bounds.extents.z);
            pos.x = transform.position.x;
            pos.y = transform.position.y;
            transform.position = pos;
        }
    }
}