station_obscurum_unity/Assets/Scripts/DynamicLine.cs

using UnityEngine;

[ExecuteAlways]
[RequireComponent(typeof(LineRenderer))]
public class DynamicLine : MonoBehaviour
{
    [SerializeField] private float length = 5f;

    [SerializeField] private int count = 2;

    private LineRenderer lineRenderer;
    private int pCount;

    private float pLength;

    // Start is called before the first frame update
    private void Start()
    {
        lineRenderer = GetComponent<LineRenderer>();
    }

    // Update is called once per frame
    private void FixedUpdate()
    {
        if (pLength != length || pCount != count) lineRenderer.positionCount = count;
    }
}