How to solve the problem with the passage of objects through each other?

Question

C++ / C#

At the start of the game, all objects enter each other and continue to move together, and should move one after another.


The code

using System.Collections;
using System.Collections.Generic;
using System.Xml.Linq;
using UnityEngine;

public class PlayerCintroller : MonoBehaviour
{
    [HideInInspector]
    public PlayerDirection direction;

    [HideInInspector]
    public float step_Length = 1f; //???

    [HideInInspector]
    public float movement_Frequensy = 0.2f;

    private float counter;
    private bool move;

    [SerializeField]
    private GameObject tailPrefab;

    private List<Vector3> delta_Position;

    private List<Rigidbody> nodes;

    private Rigidbody main_Body;
    private Rigidbody head_Body;
    private Transform tr;

    private bool createNodeAtTail;

    


    void Awake()
    {
        tr = transform;
        main_Body = GetComponent<Rigidbody>();

        InitSnakeNodes();
        InitPlayer();

        delta_Position = new List<Vector3>
        {
            new Vector3(-step_Length,0f),  //1
            new Vector3(0f, step_Length), //2
            new Vector3(step_Length, 0f), //3
            new Vector3(0f, -step_Length),//4
        };
    }

    
    void Update()
    {
        CheckMovementFrequency();
    }

    void FixedUpdate()
    {
        if (move)
        {
            move = false;
            Move();
        }  
    }

    void InitSnakeNodes()
    {
        nodes = new List<Rigidbody>();

        nodes.Add(tr.GetChild(0).GetComponent<Rigidbody>());
        nodes.Add(tr.GetChild(1).GetComponent<Rigidbody>());
        nodes.Add(tr.GetChild(2).GetComponent<Rigidbody>());

        head_Body = nodes[0];
    }

    void SetDirectionRandom()
    {
        int dirRandom = Random.Range(0, (int)PlayerDirection.COUNT);
        direction = (PlayerDirection)dirRandom;
    }

    void InitPlayer()
    {
        SetDirectionRandom();
        switch (direction)
        {
            case PlayerDirection.RIGHT:
                nodes[1].position = nodes[0].position - new Vector3(Metrics.NODE, 0f, 0f);
                nodes[2].position = nodes[0].position - new Vector3(Metrics.NODE * 2f, 0f, 0f);
                break;
            case PlayerDirection.LEFT:
                nodes[1].position = nodes[0].position + new Vector3(Metrics.NODE, 0f, 0f);
                nodes[2].position = nodes[0].position + new Vector3(Metrics.NODE * 2f, 0f, 0f);
                break;
            case PlayerDirection.UP:
                nodes[1].position = nodes[0].position - new Vector3( 0f, Metrics.NODE, 0f );
                nodes[2].position = nodes[0].position - new Vector3( 0f, Metrics.NODE * 2f, 0f );
                break;
            case PlayerDirection.DOWN:
                nodes[1].position = nodes[0].position + new Vector3(0f, Metrics.NODE, 0f);
                nodes[2].position = nodes[0].position + new Vector3(0f, Metrics.NODE * 2f, 0f);
                break;
        }

       
    }
    void Move()
    {
        Vector3 dPosition = delta_Position[(int)direction];

        Vector3 parentPosition = head_Body.position;
        Vector3 prevPosition;

        
        head_Body.position = head_Body.position + dPosition;
        main_Body.position = main_Body.position + dPosition;

        for (int i = 1; i < nodes.Count; i++)
        {
            prevPosition = nodes[i].position;

            nodes[i].position = parentPosition;
            parentPosition = prevPosition;
        }
        if (createNodeAtTail)
        {

        }

    }

    void CheckMovementFrequency()
    {
        counter += Time.deltaTime;
        if (counter >= movement_Frequensy)
        {
            counter = 0f;
            move = true;
        }
    }
}

How to decide whether the issue is in the code or needs to be configured in the engine itself?

Answer 1

I haven't looked at the code yet, but I saw that you have sphere colider disabled. Turn them on for every object

Answer 2

Offtopic, but
PlayerCintroller
Smiled)
Oh yes, I see you are not using physics for movement, but transforms.
And if you use the body, then be kind enough to move them with physics.