WEBVTT

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Layers are used to indicate some functionality

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across many different game objects in Unity.

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For instance, layers can be used to indicate

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which object should be drawn in the

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scene view, should ignore raycasts,

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or are invisible to the camera.

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Here we have a scene with 2 orbs in it.

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We can see that both orbs are on the layer Default.

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If we wanted to change the layer of 1 of the orbs

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we could click the Layer drop-down in the inspector

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and select a new layer.

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We can see that this orb is now on the

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Ignore Raycast layer

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and will not be hit by any raycasts that pass through it.

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We also have the ability to define our own layers.

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We can do so using the Tag And Layer Manager window.

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To access the tag and layer manager window

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either select Add Layer from the Layers drop-down

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or click Edit - Project Settings - Tags And Layers.

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Here we can see all of the built-in layers

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as well as add our own.

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Let's create an Ignored By Camera layer.

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We can place our other sphere

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on this newly created layer

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by selecting it and choosing the New Ignored By Camera layer

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from the Layers drop-down.

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This sphere is now on the

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Ignored By Camera layer.

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The layer has no inherent functionality however

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so let's modify our camera to ignore it.

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In the Culling Mask property of a camera

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we can select which layers are seen by the camera

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and which are not.

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By clicking the drop-down and

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unselecting the Ignored By Camera layer

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all objects on that layer will no longer

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be visible to that camera.

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Let's run our scene.

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We can see that only a single orb appears.

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The other orb, the one on the Ignored By Camera Layer

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is not rendered to the screen.

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We can also use layers to determine

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what appears in the scene view.

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By clicking on the Scene Layers drop-down

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at the top right of the Unity editor

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we can select and deselect layers.

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Doing so will cause all objects

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on those layers to disappear.