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Top Node

In Fusion, the Diagram starts with a Top Node. A Top Node is the root node in the Fusion Diagram. It is also the currently selected node from the Scene Tree. The Top Node is fixed and cannot be deleted (from the Fusion Editor).

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To select a Top Node, click a node (in the Scene Tree) and the "Extra Scene Tree" beside it shows a link called "Fusion..."  for that particular node. When the "Fusion..." link is clicked, the Fusion Editor is displayed with the current node in the Scene Tree as the Top Node in the Fusion Diagram.

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If the Fusion Editor is already currently visible, selecting any node in the Scene Tree will automatically show the Fusion Diagram of that corresponding node.

The selection of a Top Node depends on each use case. For example, the Top Node can be a button in the Scene Tree from which you want to detect click events from. Or it could be a node in the scene whose property value you want to check, in order to perform some action. Essentially, the Top Node is the node which is the source or recipient of events or values to be processed.

The Top Node only has a connector at the right side, from which all other fusion nodes can stem from. 

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Fusion Nodes

In Fusion, functionality or behavior for the scene tree nodes are strucured by using 4 different type of Fusion Nodes with the Top Node as root.  For more information on each node, click on the following fusion name below.

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