gnomic-projection-unity/Assets/URPEquirectangularCamera/CubemapRender.cs

using System.Collections;
using System.Collections.Generic;
using Unity.VisualScripting;
using UnityEngine;

[ExecuteInEditMode]
public class CubemapRender : MonoBehaviour
{
    public RenderTexture cubeMap;
    int faceMask = 63;
    Camera cam;

    void Start()
    {
        cam = GetComponent<Camera>();
    }

    void Update()
    {
        if (cubeMap != null)
        {
            // Render the scene to the cubemap
            cam.RenderToCubemap(cubeMap, faceMask);
        }
    }
}