code: def get_surface_trace(
      path, epoch, sdf, resolution=100, return_mesh=False
  ):
      grid = get_grid_uniform(resolution)
      points = grid["grid_points"]
  
      z = []
      for i, pnts in enumerate(torch.split(points, 100000, dim=0)):
          z.append(sdf(pnts).detach().cpu().numpy())
      z = np.concatenate(z, axis=0)
  
      if not (np.min(z) > 0 or np.max(z) < 0):
          z = z.astype(np.float32)
  
          (
              verts,
              faces,
              normals,
              values,
          ) = measure.marching_cubes_lewiner(
              volume=z.reshape(
                  grid["xyz"][1].shape[0],
                  grid["xyz"][0].shape[0],
                  grid["xyz"][2].shape[0],
              ).transpose([1, 0, 2]),
              level=0,
              spacing=(
                  grid["xyz"][0][2] - grid["xyz"][0][1],
                  grid["xyz"][0][2] - grid["xyz"][0][1],
                  grid["xyz"][0][2] - grid["xyz"][0][1],
              ),
          )
  
          verts = verts + np.array(
              [grid["xyz"][0][0], grid["xyz"][1][0], grid["xyz"][2][0]]
          )
  
          I, J, K = faces.transpose()
  
          traces = [
              go.Mesh3d(
                  x=verts[:, 0],
                  y=verts[:, 1],
                  z=verts[:, 2],
                  i=I,
                  j=J,
                  k=K,
                  name="implicit_surface",
                  opacity=1.0,
              )
          ]
  
          meshexport = trimesh.Trimesh(
              verts, faces, vertex_normals=-normals
          )
          meshexport.export(
              "{0}/surface_{1}.ply".format(path, epoch), "ply"
          )
  
          if return_mesh:
              return meshexport
          return traces
      return None
  
imports: import plotly.graph_objs
  import plotly.offline
  import numpy
  import torch
  from skimage import measure
  import torchvision
  import trimesh
  from PIL import Image
  from utils import rend_util
  import pickle
label_desc: Use image node_id 5 for calling a global function with example usage: get_surface_trace(path, epoch, sdf, resolution, return_mesh) and returns: None, traces, meshexport