Define here the cell visual aspect.
Faces
When the button 
Faces is down, the cell is represented as a 
solid object, that users can see from the outside or from the inside. 
This option is disabled in 
Projection, 
Rhombus and 
Sphere volumes (otherwise the filtering volume would hide 
the lattice inside).
When the button 
Faces is up, the cell is represented as a wired 
object, formed by lines connecting the vertices (or by circumpherences, 
in the 
Sphere representation).
Nodes
When the button 
Nodes is up, the nodes are visible, otherwise 
they are hidden. This option is disabled for 
Projection volumes.
Borders
Selecting 
None, no borders are shown in any volume representation. 
Selecting 
Edges, the outer line contours are shown but cell
boundaries are hidden (as long as they are in the same plane, independently 
of the lattice parameters). Selecting 
Faces, all lines are shown, 
except those inside the volume representation (for 
Parallelepiped 
and 
Sphere volumes, 
Edges and 
Faces options behave 
in the same way).
Selecting 
All shows all the border lines, including those inside. 
This option is disabled when the button 
Faces is down, because 
in solid mode, internal borders cannot be seen from the outside and make 
it very difficult to analyze something from the inside. Options 
Faces 
and 
All are disabled in 
Parallelepiped and 
Sphere 
volumes, as there are no additional lines to represent in these 
representations, only the outer lines already shown with the option
Edges. All options except 
Edges are disabled for 
Projection volumes.
At least one visual element, 
Nodes, 
Faces or 
Borders, 
must be visible when the cell is created, otherwise an error is flagged.
r, g, b
The 
r, 
g, 
b entries define the cell color,
from black (0.0, 0.0, 0.0) to white (1.0, 1.0, 1.0). It is used 
to draw the lines and nodes, in wired mode, and the solid faces, 
in solid mode. In the last case, lines and nodes are drawn using 
the current layer background color, this way assuring a good 
contrast and eliminating the need to define yet another color.
Scale
Set the cell size, including its child objects. Cell objects are
scaled around the cell center. The visual representation of an object
is always scaled by its own scale factor multiplied by the scale factor
of all its parent objects until layer, inclusive.