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All inputs to the nDisplay system are handled only by the primary node. Without any replication, only the primary node would see changes in the scene. Therefore, the primary node needs to be able to replicate changes to all other parts of the nDisplay network.

To accomplish this, nDisplay offers two different kinds of Components that you can attach to your Actors:

• The DisplayClusterSceneComponentSyncParent Component tracks changes in the 3D transforms of its parent Component, and pushes those changes to the other cluster nodes in the network.
  The default DisplayClusterPawn used by the nDisplay system uses this Component.
  

• The DisplayClusterSceneComponentSyncParent Component tracks changes to the 3D transforms of its child components, and pushes those changes to the other cluster nodes in the network.

For example, in the Actor shown below, the DisplayClusterSceneComponentSyncParent_DefaultSceneRoot Component tracks and replicates changes to the 3D transforms of its parent Actor as the Actor moves around the Level. The DisplayClusterSceneComponentSyncThis Component tracks and synchronizes movements of its child Cube component as it moves relative to the scene graph root.

If you have other Actors in your scene that can be affected during gameplay, you must use one of these two Components to replicate those changes to all nodes. To do this:

1. Select the Actor you need to replicate in the Level viewport or the World Outliner panel.

2. In the Details panel, click + Add Component . Search for either DisplayClusterSceneComponentSyncParent or DisplayClusterSceneComponentSyncThis , and select it from the list.
   

Replicating Custom Data

If you need to replicate other custom data between your primary node and the rest of your cluster, you can write your own C++ class that implements the IDisplayClusterClusterSyncObject interface. nDisplay will automatically invoke the methods in this interface to check whether each instance of this class needs to be synchronized from the primary node to the other cluster nodes.