text: """Optional 3D renderer based on Open3D's visualizer."""
  import warnings
  try:
      import open3d as o3d
      from ._artists import (Artist, Line3D, PointCollection3D, Vector3D, Frame,
                             Trajectory, Camera, Box, Sphere, Cylinder, Mesh,
                             Ellipsoid, Capsule, Cone, Plane, Graph)
      from ._figure import figure, Figure
  
      __all__ = ["figure", "Figure", "Artist", "Line3D", "PointCollection3D",
                 "Vector3D", "Frame", "Trajectory", "Camera", "Box", "Sphere",
                 "Cylinder", "Mesh", "Ellipsoid", "Capsule", "Cone", "Plane",
                 "Graph"]
  except ImportError:
      warnings.warn("3D visualizer is not available. Install open3d.")
  