# Plane Modify

- Type
- Scope
- Projection
- Position
- View

Change here object and crystallographic data for a single plane or a list of planes.

To modify a plane, click over its graphic image, or write its identification (name and number) on the Plane entry. To modify a list of planes, press the button List (after creating the list of planes with Plane->Select). Parameters for empty entries or Local choices remain unchanged.

To change a plane name write the new name in the Plane entry, followed by the plane number (GAMGI needs the number to identify the plane). To change the name for a list of planes, press List first and then write the new common name in the Name entry.

### Reference

GAMGI can handle crystallographic planes (selecting Cell), related with a cell containing the relevant crystallographic information, and atomic planes (selecting Atoms), defined by three non-colinear atoms.

For a single plane, Reference can be Cell, Atoms or Local. For a list of planes, Reference must be Local.

When Cell or Atoms is selected, the plane is recreated from scratch (as if using Plane->Create) and its old content is removed. As this requires local information for each plane, it cannot be done for a lists of planes. When Local is selected, previous features and contents are preserved, unless when specifically changed. Cell To create crystallographic planes, set Reference to Cell. GAMGI automatically shows a Cell entry, h, k, l entries to indicate the plane indices, plus a Vectors menu, to select the cell vectors to use, Conventional or Primitive. For the sake of simplicity, GAMGI does not accept 4-indice notation for planes or directions in hexagonal cells.

Pressing the mouse over a cell in the current layer, the cell identification is automatically written in the Cell entry. When a valid cell is found and its Type is Projection, the default Polygon page is automatically replaced by a Projection page. Atoms When Reference is set to Atoms, GAMGI automatically shows three Atom entries. Pressing the mouse sucessively over three non-colinear atoms in the current layer, the three entries become occupied and the plane defined. After pressing Ok, an error is shown if the atoms are disposed linearly.
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