# Cluster Link

- Object
- Shift

Link a cluster or a list of clusters to other objects.

### Hierarchy

Clusters 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 clusters. Pressing the button Above, the same menu shows the classes of objects that can own clusters.

Gamgi expects users to identify first the cluster or list of clusters and then the object to link. When the Cluster entry is active and empty, clicking the mouse over a cluster, on the current layer (local selection), its identification is transported to the Cluster entry. Pressing the List button, the current list of clusters 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 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 clusters: Object.

The Object method links a cluster or a list of clusters to a single object, Above or Below.

When linking a cluster and the Hierarchy is Above, the cluster is unlinked from its current parent and linked to the new object. When the cluster 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 cluster. An error is issued when the parent already owned the child object.

When the new child previously owned the new parent (a situation made possible because clusters can own other clusters), the new parent is first linked to the new child parent. 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 clusters Above, all clusters in the list are unlinked and linked to the parent object. When linking a list of clusters Below, the child object is replicated as many times as necessary to link each cluster in the list to a different replica.

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