Optimize loading Adaptive Probe Volume data

To optimize loading Adaptive Probe Volume (APV) data at runtime, do either of the following:

• Stream APV data.
• Load APV data from AssetBundles or Addressables.

You can’t use both methods at the same time.

Stream APV data

You can enable Adaptive Probe Volume streaming to enable Adaptive Probe Volume lighting in very large worlds. Using streaming means you can bake Adaptive Probe Volume data larger than available CPU or GPU memory, and load it at runtime when it’s needed. At runtime, as your cameraA component which creates an image of a particular viewpoint in your scene. The output is either drawn to the screen or captured as a texture. More info
See in Glossary moves, the Universal Render PipelineA series of operations that take the contents of a Scene, and displays them on a screen. Unity lets you choose from pre-built render pipelines, or write your own. More info
See in Glossary (URP) loads only Adaptive Probe Volume data from cells within the camera’s view frustum.

Unity uses Streaming Assets to store the lighting data. For more information about where Unity stores the files, refer to Streaming Assets.

To enable streaming, follow these steps:

1. From the main menu, select Edit > Project Settings > Quality.
2. Select a Quality Level.
3. Double-click the Render Pipeline Asset to open it in the InspectorA Unity window that displays information about the currently selected GameObject, asset or project settings, allowing you to inspect and edit the values. More info
   See in Glossary.
4. Expand Lighting.

You can now enable two types of streaming:

• Enable Enable GPU Streaming to stream from CPU memory to GPU memory.
• Enable Enable Disk Streaming to stream from disk to CPU memory. You must enable Enable GPU Streaming first.

You can configure streaming settings in the same window. Refer to URP Asset for more information.

Debug streaming

The smallest section URP loads and uses is a cell, which is the same size as the largest brick in an Adaptive Probe Volume. You can influence the size of cells in an Adaptive Probe Volume by adjusting the density of Light Probes

To view the cells in an Adaptive Probe Volume, or debug streaming, use the Rendering Debugger.

Load APV data from AssetBundles or Addressables

To load only the APV data you need at runtime, add the baked APV data to an AssetBundle or Addressable.

Follow these steps:

1. To store APV data in normal assets instead of Streaming Assets, go to Project Settings > Graphics > Pipeline Specific Settings > URP, then under Adaptive Probe Volumes enable Probe Volume Disable Streaming Assets. This automatically disables Enable Disk Streaming.
2. Bake your lighting.
3. Add the sceneA Scene contains the environments and menus of your game. Think of each unique Scene file as a unique level. In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. More info
   See in Glossary to an AssetBundle. For more information about how to add assets to AssetBundles and load them at runtime, refer to AssetBundle workflow.

Enabling Probe Volume Disable Streaming Assets may increase the amount of memory APV uses at runtime. Unity has to keep all the lighting data associated with the current Baking Set in memory, regardless of whether all scenes are loaded.

Additional resources

• Understanding Adaptive Probe Volumes