Humm, on my PC it doens't work, the spheres are black (I use POV-ray v3.7 b27 so
maybe it doesn't support cutaway_textures...)

Are you sure the box stores the texture of every point of the space, not only on
its surface ?...

What I first wanted to do was to put spheres on the object without the object
itself (like a wireview with spheres instead of wires).

Would something like :

object {
  difference {
    union {
      object { MyObject }
      object { MyObject invert }
    }
    sphere { TheSpheresToPut }
    cutaway_texture
  }
invert
}

work ?

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