Question VR Curved RayCast - Sometimes no collision with the ground

Sometimes one of the RayCasts missed the collision or it happens between two RayCasts? Does anybody know how to fix it?

Issue:

Code:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class CurvedRaycast : MonoBehaviour
6. {
7.     //Raycast needs
8.     public GameObject hitPointObject;
9.     public LayerMask layerMask;
10.     public RaycastHit hit;
11.     public List<Vector3> positions;
12.     public LineRenderer lineRenderer;
13.     public Material greenSteps;
14.     public Material redSteps;
15.     public bool isTeleporatationsystemActive;
16.     private Vector3 raycastDirection;
17.     private Vector3 raycastPosition;
18.    
19.     //Settings
20.     public int rayCastSpawnLimit = 20;
21.     public float rayCastLength = 0.1f;
22.     public float gravity = 9.81f;
23.     private float smooth = 0.01f;
24.     private int amountOfRaycastsSpawned;
25.  
26.     private void FixedUpdate()
27.     {
28.         raycastDirection = transform.up * -1.0f;
29.         curvedRaycast();
30.         raycastPosition = transform.position;
31.     }
32.  
33.     private void curvedRaycast()
34.     {
35.         if (amountOfRaycastsSpawned > rayCastSpawnLimit -1) {amountOfRaycastsSpawned = 0;}
36.  
37.         while (amountOfRaycastsSpawned < rayCastSpawnLimit)
38.         {
39.             positions.Add(raycastPosition);
40.             //Raycast in the starting direction and check for a hit
41.             if (Physics.Raycast(raycastPosition, raycastDirection, out hit, rayCastLength, layerMask))
42.             {
43.                 Debug.DrawRay(raycastPosition, raycastDirection * rayCastLength, Color.red, rayCastLength);
44.                 if(hit.collider.gameObject.tag == "Ground")
45.                 {
46.                     isTeleporatationsystemActive = true;
47.                     GetComponent<Renderer>().material = greenSteps;
48.                     hitPointObject.SetActive(true);
49.                 }
50.                 else
51.                 {
52.                     isTeleporatationsystemActive = false;
53.                     GetComponent<Renderer>().material = redSteps;
54.                     hitPointObject.SetActive(false);
55.                 }
56.                 hitPointObject.transform.position = hit.point;
57.             }
58.             else
59.             {
60.                 isTeleporatationsystemActive = false;
61.                 GetComponent<Renderer>().material = redSteps;
62.                 hitPointObject.SetActive(false);
63.                 Debug.DrawRay(raycastPosition, raycastDirection * rayCastLength, new Color(Random.Range(0f, 1f),Random.Range(0f, 1f),Random.Range(0f, 1f)), rayCastLength);
64.  
65.                 //Adds a new ray cast
66.                 raycastPosition += raycastDirection * rayCastLength;
67.                 raycastDirection += new Vector3(0.0f, -gravity * smooth, 0.0f);
68.                 hitPointObject.transform.position = raycastPosition;
69.             }
70.             amountOfRaycastsSpawned++;
71.         }
72.  
73.         //Line renderer
74.         lineRenderer.startWidth = 0.1f;
75.         lineRenderer.endWidth = 0.1f;
76.         lineRenderer.useWorldSpace = true;
77.         lineRenderer.positionCount = positions.Count;
78.         lineRenderer.SetPositions(positions.ToArray());
79.         positions.Clear();
80.     }
81. }