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The Layers panel allows you to organize Actors in your Level.

Layers provide the ability to quickly select as well as control visibility of groups of related Actors. You can use your layers to quickly un-clutter a scene leaving only the geometry and Actors that you are working with. For example, you might be working on a building that has multiple levels but is comprised of many modular parts. By assigning each floor to a layer, you can hide each of the floors you are not working on making the top view much more manageable.

An Actor can be in as many layers as you want. This might be useful if you have different sets of Actors that fall under overlapping layers. For instance, you could organize your layers by assigning everything within a particular zone to one layer and have another layer comprised of all the doors in your level.

When creating large levels, the more extensively you use layers, the easier your job will be. And remember, it is always easier to start using layers from the beginning rather than trying to incorporate them after you are already deep into the creation of your level.

Layer Creation

Layers are created in the Layers panel either as empty or using the current selection.

To create an empty layer:

1. Right-click in the Layers panel and choose Create Empty Layer .

2. The new layer is displayed in the list.

To create a layer from a selection:

1. Select the objects to add to the layer in the viewport.

2. Right-click in the Layers panel and choose Add Selected Actors to New Layer .

3. The new layer containing the Actors is displayed in the list.

To create a layer by drag and drop:

1. Select the Actor(s) to add to the layer.

2. Drag the Actor(s) from the World Outliner on to the empty area in the Layers panel.

3. The new layer containing the Actors is displayed in the list.

Layer Naming

By default, new layers are given a name using a Layer[number] naming scheme. The number is incremented for each new layer. It is best to make sure you name your layers with descriptive names, and never leave the default naming. For instance, a layer that contains small items scattered on the floor might be named Ground Clutter . This not only makes it easy to quickly see what each layer contains, but also makes it possible to filter the layers using the search feature.

To rename a layer:

1. Right-click on the layer and choose Rename from the context menu.

2. Enter a name in the text box containing the current name.

3. The layer is displayed with the new name.

Searching Layers

Layers can be filtered using the search box at the top of the Layers panel. Filtering occurs based on matches between the text entered in the search box and the names of the layers. As you type in the box, the list of layers is filtered in real-time; only displaying those layers whose names match the text.

Press the 'X' button to clear the current search terms.

Layer Contents

The contents of a layer can be viewed directly in the Layers panel. The layer contents view displays the name of the layer, a list of all Actors contained in the layer, and information about the layer's contents. To enter the layer contents view, press the See Contents button at the bottom of the Layers panel with the layer you want to view selected.

The name of the layer is displayed at the top along with a collection of buttons showing the various types and numbers of Actors contained within the layer.

The various buttons to the right of the layer's name show how many of each individual type of Actor are contained within the layer. For instance, the button in the bottom right of the Layers panel informs the user that there are 139 StaticMeshActors contained within the layer.

To return to the layer list, press the button.

Adding Actors

Actors can be added to one or more layers as a selection or by dragging and dropping from the World Outliner .

To add a selection of Actors:

1. Select the Actor(s) to add to the layer.

2. Right-click on the layer you want to add the Actors to and choose Add Selected Actors to Selected Layers .

To add by drag and drop:

1. Select the Actor(s) to add to the layer.

2. Drag the Actor(s) from the World Outliner on to a layer in the Layers panel.

   You can also drag to the contents bar at the bottom of the Layers panel to assign the Actors to the selected layer.

   The layers the Actors are already assigned to are grayed out when dragging and dropping. Additionally, if the Actors being dragged are already assigned to the target layer, a message will inform you of this:

3. The Actors are added to the layer.

Removing Actors

Actors can be removed from the layer individually or as a group of selected Actors.

To remove individual Actors:

1. Press the 'X' button next to the Actor in the layer contents view.

2. The Actor is removed from the layer and the list is updated.

To remove a selection of Actors:

1. Select the Actors to be removed from the layer.

2. Right-click on the layer and choose Remove Selected Actors from Layers .

3. The Actors are removed from the layer.

Searching Layer Contents

The Actors within a layer can be filtered in the layer contents view using the search box at the top. Filtering occurs based on matches between the text entered in the search box and the names of the Actors. As you type in the box, the list of Actors is filtered in real-time; only displaying those Actors whose names match the text.

Press the 'X' button to clear the current search terms.

Visibility

The contents of any layer can be shown or hidden by toggling the Visibility (eye) button for the layer in the layer list.

Selection Methods

Actors within a layer can be selected as a group, individually, or based on type. The Actors within a layer can also be added to or removed from the current selection.

To select all Actors within a layer:

1. Double-click the layer in the layer list or right-click on the layer and choose Select Actors .

2. All Actors in the layer are selected, replacing the current selection set.

To append layer Actors to the selection:

1. Right-click on the layer and choose Append Actors to Selection .

2. All Actors in the layer are selected, appending them to the current selection set.

   Initial Selection	Layer Actors Appended

To remove layer Actors from the selection:

1. Right-click on the layer and choose Deselect Actors .

2. All Actors in the layer are removed from deselected, removing them from the current selection set.

   Initial Selection	Layer Actors Removed

Type-Specific Selection

Type-specific selection allows you to quickly select all of one type of Actor contained within a layer. This can be performed using the buttons in the contents bar of the main layer list or the title bar of the layer contents view.

Pressing the instances button selects all of the StaticMeshActors in the layer.

Details Layers Section