code: def save_frame(x, y, z):
      """Helper to generate and store a frame of the eversion."""
      plotter.clear()
      plotter.enable_lightkit()
      plotter.add_mesh(pv.StructuredGrid(x, y, z), **opts)
      plotter.write_frame()
  
imports: import numpy
  import pyvista
label_desc: Use image node_id 5 for calling a global function with example usage: save_frame(x, y, z) without return types