code: def storePly(path, xyz, rgb):
      # Define the dtype for the structured array
      dtype = [
          ("x", "f4"),
          ("y", "f4"),
          ("z", "f4"),
          ("nx", "f4"),
          ("ny", "f4"),
          ("nz", "f4"),
          ("red", "u1"),
          ("green", "u1"),
          ("blue", "u1"),
      ]
  
      normals = np.zeros_like(xyz)
  
      elements = np.empty(xyz.shape[0], dtype=dtype)
      attributes = np.concatenate((xyz, normals, rgb), axis=1)
      elements[:] = list(map(tuple, attributes))
  
      # Create the PlyData object and write to file
      vertex_element = PlyElement.describe(elements, "vertex")
      ply_data = PlyData([vertex_element])
      ply_data.write(path)
  
imports: import os
  import sys
  from PIL import Image
  from typing import NamedTuple
  from scene.colmap_loader import read_extrinsics_text, read_intrinsics_text, qvec2rotmat, read_extrinsics_binary, read_intrinsics_binary, read_points3D_binary, read_points3D_text
  from utils.graphics_utils import getWorld2View2, focal2fov, fov2focal
  import numpy
  import json
  from pathlib import Path
  from plyfile import PlyData, PlyElement
  from utils.sh_utils import SH2RGB
  from scene.gaussian_model import BasicPointCloud
label_desc: Use image node_id 4 for calling a global function with example usage: storePly(path, xyz, rgb) without return types