How can I calculate the distance from the floor on specific floor ?

I have many objects that are Floor in the Hierarchy. So I searched in the Hierarchy for all the Floors and tagged them all as Floor.

Now in the script I want to make it global script so I can use it in many places/cases.

In this case I'm in a room and the transform the script is attached to have a Rigidbody component and the transform just fall down. Before I used OnCollisionEnter to find when the transform hit the floor. But now I want to calculate the distance between the transform and floor and to decide at what distance to stop the falling. For example at distance 1 or distance 3 or maybe distance 7.

So I'm using ground array to find all the Floors and then trying to calculate the distance:

Code (csharp):

1.  
2. distance = Vector3.Distance(transform.position, ground.transform.position);
3.             if (distance > 1)
4.  

But the ground is array. So how can I find the current floor I'm standing on ?
Should I loop over all the Floors and calculate the distances ?

Code (csharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5.  
6. public class NaviMove : MonoBehaviour
7. {
8.     public GameObject target;
9.     public ObjectsManipulation om;
10.     public float moveSpeed = 1f;
11.     public float maxFallSpeed = 2f;
12.     public float rotationSpeed = 1f;
13.     public GameObject player;
14.  
15.     private Rigidbody rigid;
16.     private Waypoints waypoints;
17.     private Camera navicam;
18.     private GameObject[] ground;
19.     private float distance;
20.  
21.     void Awake()
22.     {
23.         rigid = GetComponent<Rigidbody>();  //get the rigidbody that attached to the object
24.     }
25.     void Start()
26.     {
27.         waypoints = GetComponent<Waypoints>();
28.         navicam = GetComponent<Camera>();
29.         ground = GameObject.FindGameObjectsWithTag("Floor");
30.     }
31.     void FixedUpdate()  //physic should be done in FixedUpdate not Update
32.     {
33.         if (DetectInteractable.detected == true && ItemAction.move == true)
34.         {
35.             transform.parent = null;  //disconnect the object for it's parent
36.             om.stopRotation = true;
37.             rigid.isKinematic = false;
38.         }
39.         if (om.stopRotation == true && ItemAction.move == true)
40.         {
41.             distance = Vector3.Distance(transform.position, ground.transform.position);
42.             if (distance > 1)
43.             {
44.                 navicam.enabled = true;
45.                 navicam.transform.rotation = transform.rotation;
46.                 navicam.transform.forward = transform.forward;
47.                 if (rigid.velocity.sqrMagnitude > maxFallSpeed) //check if it's falling to fast
48.                 {
49.                     rigid.velocity *= 0.01f; // falling to fast, so reduce speed,  you may want to play around with this number.
50.                 }
51.                 else // if not falling to fast add force to make it fall faster
52.                 {
53.                     rigid.AddForce(Vector3.down * moveSpeed);
54.                 }
55.             }
56.             else
57.             {
58.                 ItemAction.move = false;
59.                 rigid.isKinematic = true;
60.                 waypoints.enabled = true;
61.                 player.SetActive(false);
62.             }
63.         }
64.     }
65.  
66.     private void OnCollisionEnter(Collision collision)
67.     {
68.         if (collision.transform.name.Contains("Floor"))
69.         {
70.            
71.         }
72.     }
73. }
74.  

Maybe I should stay with the OnCollisionEnter but then how can I calculate the distance and decide from what distance to stop falling ?

 

In onCollisionEnter the collision object has a field Gameobject, so you can check your Y position against that gameobjects Y position

https://docs.unity3d.com/ScriptReference/Collision.html

 

You could use Physics.Raycast , RaycastHit.distance and a layerMask.