toSublattice can only be applied to polytopes, i.e. compact polyhedra. It calculates a basis of the sublattice generated by its lattice points, and then takes the affine preimage under the corresponding map.
i1 : P = convexHull transpose matrix {{0,0,0},{1,0,0},{0,1,0},{1,1,3}} o1 = P o1 : Polyhedron |
i2 : toSublattice P o2 = Polyhedron{...1...} o2 : Polyhedron |