In the Objects in Unit Cell tab, the different objects appearing in the grid can be defined. At the bottom, choose the Object Type and click Add to define further parameters. With Remove, an object can be deleted from the selection. The available Object Types are the same as in GadGeo (find detailed explanation there). Observe the Material ID of each object, which depends on the selection of the Material Mode. Change the material, if necessary, by clicking on it and choosing a new material from the Material Selector.

The pull-down menu gives access to selecting the desired material from the GeoDict Material Database. When none of the materials available in the database fit the preferred specifications, Manual should be chosen. Alternatively, a new material with the desired specifications can be added to the Material Database (see the Material Database handbook).

 

To match realistic material colors for visualization in a certain application, the default material colors can be changed through the Color & Visibility tab of the GUI sidebar. For more visualization options, see the Visualization handbook.

Example 1

The first example is a Simple Cubic Grid with a smaller sphere in the middle, which can be generated in a rectangular grid.

Example 2

The next example is a HCP (hexagonal close-packed) grid, which can be generated with two sphere objects in a non-orthogonal grid.

In contrast to the Simple Cubic, Body-Centered Cubic and Face-Centered Cubic lattices, a Hexagonal lattice cannot be generated with only one sphere and three basis vectors. The reason is, that a hexagonal lattice is not a Bravais lattice (https://en.wikipedia.org/wiki/Bravais_lattice). The relation from layer A to layer B is different from the relation of layer B to the next layer A (see also the Relation between FCC and Hexagonal).