# Plane Link

- Object
- Shift

Link an plane or a list of planes to other objects.

### Hierarchy

Planes can be linked to objects above or below, in the Gamgi hierarchy. Pressing the button Below (the default), the class menu shows the classes of objects that can be owned by planes: Orbital and Text (the default). Pressing the button Above, the same menu shows the classes of objects that can own planes: Layer (the default), Assembly, Cell, Cluster, Molecule, Group, Plane and Direction.

Gamgi expects users to identify first the plane or list of planes and then the object to link. When the Plane entry is active and empty, clicking the mouse over an plane, on the current layer (local selection), its identification is transported to the Plane entry. Pressing the List button, the current list of planes is selected instead.

Gamgi is now expecting users to click on a object of the class currently selected in the class menu. This object can be in a different layer or even in a different window (global selection).

To select a visible object, just press the mouse over the object, in its window. To select objects without visual representation, such as layers and lights, press the mouse over the graphic area in the window, to create a menu with all the objects of that class in the window, which can then be selected.

### Method

Gamgi suppports only one method to link planes: Object.

The Object method links a plane or a list of planes to a single object, Above or Below.

When the Hierarchy is Above, the plane is unlinked from its current parent and linked to the new object. When the plane is moved to a different layer, its bonds are automatically removed. When the Hierarchy is Below, the child object is unlinked from its current parent and linked to the plane. An error is issued when the parent already owned the child object.

After the linking operation, Gamgi always puts on top the window and layer containing the linked objects.

When linking a list of planes Above, all planes in the list are unlinked and linked to the parent object. When linking a list of planes Below, the child object is replicated as many times as necessary to link each plane in the list to a different replica.
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