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Hi!

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:

https://doc.sagemath.org/html/en/thematic_tutorials/geometry/polyhedra_quickref.html

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):

https://www.csun.edu/~ctoth/Handbook/chap15.pdf

Is the operation described in there?

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