The -F option of off_align aligns a face on the
brick with a face on the base
and then uses it to augment or excavate the base model (the polyhedra
are joined and the bonding faces removed). This operation can be
repeated symmetrically with the -y option.
In this example a triangular prism is aligned with a face of an icosahedron.
The bonding operation is repeated with tetrahedral symmetry, a subsymmetry
of the base model, by specifying -y T.
View this model with the command
off_align -F pri3,5 -y T icosahedron | antiview