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/them...

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/...

Is the operation described in there?

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