Can't pickle Actors about vedo

[marcomusy]

Hi, you cannot pickle vtk objects, but you can still save single or multiple object to file, eg:

from vtkplotter import *

obj1 = Sphere()
obj2 = Torus().pos(0,0,1)

# single mesh
obj1.write('mysphere.vtk')

# multiple meshes/volumes
write([obj1, obj2], 'myobjs.npy')

then you can read them back with vtkplotter.load() or in terminal by command line:
> vtkplotter myobjs.npy