collisionBox

using EasyBuildSystem.Runtimes.Internal.Builder;
using EasyBuildSystem.Runtimes.Internal.Managers;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;

public class CollisionDetection : MonoBehaviour
{
    public GameObject m_MyObject;
    BoxCollider m_Collider;

    void Start()
    {
        if (m_MyObject != null)
            m_Collider = m_MyObject.GetComponent<BoxCollider>();
    }

    private void Update()
    {
        if (GameMaster.Instance.BuildSystem.currentPreview != null)
        {
            m_Collider.center = GameMaster.Instance.BuildSystem.currentPreview.GetComponent<BoxCollider>().center;
            m_Collider.size = GameMaster.Instance.BuildSystem.currentPreview.GetComponent<BoxCollider>().size;
        }

        Ray ray = Camera.main.ScreenPointToRay(new Vector3(Input.mousePosition.x, Input.mousePosition.y, 1.0f));

        RaycastHit[] hitpoints = Physics.RaycastAll(ray).OrderBy(h => h.distance).ToArray(); //sort by distance
        foreach (RaycastHit hit in hitpoints)
        {
            if (hit.collider.gameObject != this.gameObject)
            {
                Vector3 newPos = hit.point;
                transform.position = newPos;
                continue;
            }
        }

        if (GameMaster.Instance.placedParts != null)
        {
            var allowPlacement = true;

            foreach (var part in GameMaster.Instance.placedParts)
            {
                if (m_Collider.bounds.Intersects(part.GetComponent<BoxCollider>().bounds))
                {
                    allowPlacement = false;
                    break; ;
                }
            }

            if (!allowPlacement)
            {
                GameMaster.Instance.BuildSystem.allowPlacement = false;
            }
            else
            {
                GameMaster.Instance.BuildSystem.allowPlacement = true;
            }
        }
    }
}