Sistema de construcion

[Gastonspas 5]

Hola tengo una duda y es por que al no quitarle la colision al objecto el objecto viene hacia mi al apuntar al suelo el video para que se entienda mas y el codigo abajo

 

https://www.youtube.com/watch?v=IXUsKMsBsn8&feature=youtu.be

 

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

public class constr : MonoBehaviour {

    public GameObject fogata;

    Vector3 targetPosition;

    public bool construir = false;
    public bool mostar = false;

    public GameObject obejc;

    public float rotate = 0.0f;
    public float altura = 0.0f;
    public float altu_defautl = 0.0f;
    public float rotate_2 = 0.0f;
    public int contador = 0;
    public bool tocar = false;

    public Collider payer;

    void Start()
    {
        targetPosition = transform.position;
    }


    void Update()
    {
        if (Input.GetKey(KeyCode.R) && mostar)
        {
            rotate += 0.45f;
            obejc.GetComponent<Transform>().eulerAngles = new Vector3(obejc.transform.rotation.x, rotate, obejc.transform.rotation.z);
        }
        if (Input.GetKey(KeyCode.T) && mostar && !tocar)
        {
            contador++;

            if (contador == 0)
                rotate = 45.0f;
            if (contador == 1)
                rotate = 90.0f;
            if (contador == 2)
                rotate = 135.0f;
            if (contador == 3)
                rotate = 180.0f;
            if (contador == 4)
                rotate = 225.0f;
            if (contador == 5)
                rotate = 270.0f;
            if (contador == 6)
                rotate = 315.0f;
            if (contador == 7)
                rotate = 360.0f;
            if (contador == 8)
            {
                rotate = 0.0f;
                contador = -1;
            }
            tocar = true;
            Invoke("toqui", 0.25f);
        
            obejc.GetComponent<Transform>().eulerAngles = new Vector3(obejc.transform.rotation.x, rotate, obejc.transform.rotation.z);
        }
        if (Input.GetKey(KeyCode.Alpha1))
        {
            altura = 0.0f;
            Destroy(obejc);
            rotate = 0f;
            mostar = true;
            rotate = fogata.transform.rotation.y;
            obejc = Instantiate(fogata, targetPosition, fogata.transform.rotation);
            sacar_coli(obejc);
        }
        if (Input.GetMouseButtonDown(0) && mostar == true)
        {
            construir = true;
        }
        if (Input.GetMouseButton(1) && mostar == true)
        {
            mostar = false;
            Destroy(obejc);
        }
        if (mostar)
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            RaycastHit hit;

            if (Physics.Raycast(ray, out hit, 7f))
            {
                targetPosition = hit.point;
                altu_defautl = hit.point.y;
                if (Input.GetAxis("Mouse ScrollWheel") < 0f)
                {
                    altura += 0.01f;
                }
                if (Input.GetAxis("Mouse ScrollWheel") > 0f)
                {
                    altura -= 0.01f;
                }
                altu_defautl -= altura;
                targetPosition.y = altu_defautl;
                obejc.transform.position = targetPosition;
                if (construir)
                {
                    
                    GameObject asd;
                    
                    asd = Instantiate(obejc, obejc.transform.position, obejc.transform.rotation);
                    poner_coli(asd);
                    Destroy(obejc);
                    construir = false;
                    mostar = false;
                }
            }
        }
        
    }
    void toqui()
    {
        tocar = false;
    }

    void sacar_coli(GameObject obj)
    {
        Collider[] col = obj.GetComponents<Collider>();
        for (int i = 0; i < col.Length; i++)
        {
            col[i].enabled = false;
        }
    }

    void poner_coli(GameObject obj)
    {
        Collider[] col = obj.GetComponents<Collider>();
        for (int i = 0; i < col.Length; i++)
        {
            col[i].enabled = true;
        }
    }
}