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Could give a precise definition of what you mean by stellation?

There is a quick reference page about things you can do with a polyhedron:

Perhaps what you mean is related to the following methods. Say P is a polyhedron object then

  • P.barycentric_subdivision(): constructs a polyhedron out of P whose facets correspond to complete flags of faces of P.
  • P.stack(face): puts a new vertex a little bit outside of the face face.

In general, Sage tries to follow the nomenclature presented in the Handbook of Discrete and Computational Geometry (Chapter 15):

Is the operation described in there?

Otherwise, please let us know what is the operation and we will add it to the desired methods.