Version: 2019.1 (switch to 2018.4
Lightmapping
Progressive CPU Lightmapper
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Progressive GPU Lightmapper (Preview)

Note: This is a preview feature and is subject to change. If you have ScenesA 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
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 GPU Lightmapper gives you an interactive workflow when you’re setting up and tweaking the lighting in your Scene. Because this lightmapper uses the GPU in your computer 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
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, it’s a faster alternative to the CPU Progressive Lightmapper. Sampling and noise patterns look slightly different than those produced by the CPU lightmapper, because the sampling algorithm is different.

Hardware and software requirements

To use the Progressive GPU Lightmapper, your computer must have:

  • At least one GPU with OpenCL 1.2 support
  • At least 2GB of dedicated GPU memory
  • A CPU that supports SSE4.1 instructions

If your computer has more than one GPU, Unity selects the same GPU that the Editor uses. It is possible to choose one GPU for rendering and a different GPU for light baking. For information on how to change this, see the section below, Configure which GPU to use for the lightmapper.

Note: If the baking process uses more than the available GPU memory, the process can fall back to the CPU Lightmapper. Some graphics drivers with virtual memory support swap to CPU memory instead, which makes the baking process slower.

Select the Progressive GPU Lightmapper

To select the Progressive GPU Lightmapper in the Unity Editor:

  1. In your Project, go to Window > 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
    > Lighting Settings.
  2. Under Lightmapping Settings, find the LightmapperA tool in Unity that bakes lightmaps according to the arrangement of lights and geometry in your scene. More info
    See in Glossary
    property, and select Progressive GPU (Preview) in the drop-down menu.
Select the Progressive GPU Lightmapper under Lightmapper in Lightmapping Settings.
Select the Progressive GPU Lightmapper under Lightmapper in Lightmapping Settings.

Configure which GPU to use

It is possible to select one GPU for rendering the Scene and another GPU for baking lighting. If the automatic GPU assignment don’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: In your Project, open the Lighting window. Next to Bake Performance, you can see the GPU.

To see the available GPUs in your machine:

  1. Make sure you’ve selected the Progressive GPU lightmapper in the Editor.
  2. Generate the lighting in your Scene.
  3. Open File Explorer, and navigate to the following path: C:\Users\USER\AppData\Local\Unity\Editor. Open the file called Editor.log.
  4. In the file, search for the line Listing OpenCL platforms. This should jump to the part of the log with information about OpenCL devices. Here, you can see your available GPUs along with their corresponding platform and device indexes.

To select a specific GPU for baking, enter this command at the command line (replace platform and 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.

Limitations

The Progressive GPU Lightmapper does not support:

  • Baked LOD
  • A-Trous filtering. It only uses Gaussian filtering
  • The custom bake API (experimental)
  • Submeshes (the lightmapper uses Material properties on the first submesh)

  • 2019–04–18 Page published with editorial review
  • Preview of Progressive GPU Lightmapper added in 2018.3 NewIn2018X

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Lightmapping
Progressive CPU Lightmapper