Dialog Box: Labels [ Display Menu]
This option can cause either form letters or the numeric indices of each face to be written. The label is written at the center of the face, which is located by averaging the corners. Labels are not written in the Cartesian mode. Face indices may be shown with or without the standard parentheses or brackets. The form letters are entered for each form in the Add/Revise Form dialog in the Input1 menu.
You can Label back faces , but only if back edges are shown (Line Attributes dialog, Input2 menu). You can select the Colors for the labels for front and back faces: usually these should be the same as the colors for the front and back edges set in the Line Colors dialog, Input2 menu.
The negative Signs for indices may be above each number, in conventional crystallographic style, or before the number, in normal mathematical style (positive signs are never shown). If the chosen font is not fixed-width (see below), signs above may not work correctly. In D3D (Windows) drawing mode signs are always before the numbers.
The labels can be offset by uniform amounts across and up, or the observer y and z directions.
If you select Opaque , rather than Transparent , there will be a white block behind each label. However, this is not recommended for indices because the small bars over the numbers, denoting negative signs for the index, are actually formed by writing underscores on another line above the numbers.
It is best to select a fixed-width Font such as Courier, because the correct location of the negative sign bars above the numbers depends on letters having a constant width. Fixed-width fonts typically have "fixed" or "mono" in the name. The font in PostScript output will always be Courier.
In the 3D display mode, the position in space of the labels depends on whether actual planar faces are shown (3D Parameters dialog, Input2 menu). If faces are not shown, the labels are written at the center of each face. If faces are shown, the labels are all in a plane which is in front of the entire crystal.