code: def _replace_picked_voxel_actor(self, x, y, z):
      if self._picked_voxel_actor:
          self._scene.rm(self._picked_voxel_actor)
      pnt = np.asarray([[x, y, z]])
      pnt = apply_affine(self._affine, pnt)
      self._picked_voxel_actor = actor.dot(
          pnt, colors=(0.9, 0.4, 0.0), dot_size=10
      )
      self._scene.add(self._picked_voxel_actor)
  
imports: import warnings
  import numpy
  from scipy import stats
  from dipy.utils.optpkg import optional_package
label_desc: Use image node_id 6 for calling the SlicesVisualizer obj's underlying member method code with example usage: obj._replace_picked_voxel_actor(x, y, z) without return types