1 | initial version |

I can confirm this with an easier example:

sage: var('x,y')

(x, y)

sage: f(x,y)=x^2+y^2

sage: p=plot3d(f,(-5,5),(-5,5))

sage: p # works fine

sage: p.save('test.sobj')

sage: q = load('test.sobj')

sage: q

NotImplementedError: You must override the get_grid method.

I will try to look into this later; it's puzzling to me, since we get

sage: type(q)

`<type 'sage.plot.plot3d.parametric_surface.ParametricSurface'>`

sage: type(p)

`<type 'sage.plot.plot3d.parametric_surface.ParametricSurface'>`

as expected.

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