Note: This is a preview feature and is subject to change. If you have Scenes that use this feature, you might need to update them in a future release. Do not rely on this feature for full-scale production until it is officially released.
The Progressive GPU LightmapperA tool in Unity that bakes lightmaps according to the arrangement of lights and geometry in your scene. More info
See in Glossary is a backend for the Progressive Lightmapper that uses your computer’s GPU and VRAM to generate baked lightmapsA pre-rendered texture that contains the effects of light sources on static objects in the scene. Lightmaps are overlaid on top of scene geometry to create the effect of lighting. More info
See in Glossary and Light ProbesLight probes store information about how light passes through space in your scene. A collection of light probes arranged within a given space can improve lighting on moving objects and static LOD scenery within that space. More info
See in Glossary.
To use the Progressive GPU Lightmapper, your computer must have:
If your computer has more than one GPU, Unity selects the same GPU that the Editor uses. You can also choose one GPU for renderingThe process of drawing graphics to the screen (or to a render texture). By default, the main camera in Unity renders its view to the screen. More info
See in Glossary and a different GPU for light baking. For information on how to change this, see the Configure which GPU to use section of this page.
Note: If your project uses multiple Light Probe Groups, the Progressive GPU Lightmapper (preview) might use more than the available GPU memory and fall back to the CPU Lightmapper. Avoid using Progressive GPU Lightmapper (preview) with multiple Light Probe Groups.
To reduce GPU memory usage, put all Light Probes into a single Light Probe Group.
Note: If the baking process uses more than the available GPU memory, the process might fall back to the CPU Lightmapper. Some graphics drivers with virtual memory support swap to CPU memory instead, which makes the baking process slower.
You can select one GPU for rendering 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 and another GPU for baking lighting. If the automatic GPU assignment doesn’t fit your needs, you can specify which graphics card to use for baking.
To see which GPU Unity currently uses for baking, in the Editor:
To see the available GPUs in your machine:
To select a specific GPU for baking, enter this command at the command line (replace
device index with the relevant numbers):
Unity.exe "-OpenCL-PlatformAndDeviceIndices" <platform> <device index>
Your choice of assignment should depend on your needs while you’re working on the Scene. If you assign the strongest GPU to either activity, this can incur a performance impact on the other activity. If you encounter issues, try re-assigning GPUs.