Up    Next

lat_grid - lattices and grids with integer coordinates

Usage

Synopsis

Description

Options

Lattice types (default: sc)

Lattice Type	Description	Squares of Strut Lengths†
sc	Simple Cubic	1, 2, 3
fcc	Face Centred Cubic	2, 4, 6, 12
hcp	Hexagonal Close Packing	18
bcc	Body Centred Cubic	3, 4, 8
rh_dodec	Rhombic Dodecahedra	3, 8
cubo_oct	Cuboctahedron / Octahedron	2
tr_oct	Truncated Octahedron	2
tr_tet_tet	Truncated Tetrahedron / Tetrahedron	2
tr_tet_tr_oct_cubo	Truncated Tetrahedron / Truncated Octahedron / Cuboctahedron	4
diamond	Diamond	3
hcp_diamond	HCP Diamond	27
k_4	K_4 Crystal	2

†The first strut length value is the square of the radius of balls packed at the vertex positions.

Outer Width, Inner Width

The sizes of the outer and inner containers. For cubes, these are the length of a side, for spheres these are the squares of the radii (default: outer - 6, inner - 0).

-h

program help

-C <cent>

centre of lattice, in form x_val,y_val,z_val (default: calculated)

-c <type>

container, c - cube (default), s - sphere

-s <len2>

create struts, the value is the square of the strut length

-o <file>

write output to file, if this option is not used the program writes to standard output

Examples

   lat_grid fcc 6 | antiview -v b

   lat_grid -c s -s 3 diamond 16 > diam.off

Notes

The grids of shortest strut length represent the edges of a packing of polyhedra, with the exception of diamond, HCP diamond and K_4.

Up: Programs and Documentation
Next: bravais - Bravais lattices