Version: 2019.4
Precomputed lighting data
Lighting Data Asset

Generating lighting data

In Unity, precomputed lighting is generated in the background either as an automatic process or when manually initiated. It is possible to continue working in the editor while these processes run.

When the precompute process is running, a blue progress bar will appear in the bottom right of the Editor. There are different stages which need to be completed depending on whether Baked GI or Realtime GI (deprecated) is enabled. Information on the current process is shown on top of the progress bar.

La barra de progreso muestra el estado actual del precompute (precalculo) de Unity.

The stages of lighting precomputation are listed below:

Realtime GI (deprecated)

  1. Crea Geometría
  2. Layout Systems
  3. Create Systems
  4. Create Atlas
  5. Clustering
  6. Visibility
  7. Light Transport
  8. Tetrahedralize Probes
  9. Create ProbeSet


  1. Ambient Probes
  2. Baked/Realtime Ref. Probes

Baked GI

  1. Crea Geometría
  2. Atlassing
  3. Crea Systemas Baked
  4. Recursos Baked
  5. Bake AO
  6. Exporta Textura Baked
  7. Bake Visibilidad
  8. Bake Direct
  9. Ambient y Emissive
  10. Crea Sistemas Bake
  11. Bake Runtime
  12. Upsampling la Visibilidad
  13. Bake Indirect
  14. Final Gather
  15. Bake ProbesSet
  16. Compositing

Generating data

Only static geometry is considered by Unity’s precomputed lighting solutions. To begin the lighting precompute process, you need at least one GameObject marked as ‘static’ in your Scene.

When you manually initiate a precompute, all aspects of your Scene lighting are evaluated and computed. To recalculate and bake just the Reflection Probes by themselves, click the drop-down menu attached to the Generate Lighting button in the Lighting window.

NOTE: When using Auto Generate mode, Unity stores your lighting data in a temporary cache with a limited size. This means that when you exceed the cache’s size, Unity deletes old lighting data. A problem might occur when building your project if some of your Scenes rely on auto-generated lighting data that has been deleted. In this case, your Scenes might not have the correct lighting in the built project. Therefore, before building your game, you should uncheck Auto Generate, and generate the lighting data manually for all your Scenes. Unity then saves your lighting data as Asset files in your project folder, which means you have the data saved as part of your project and included in your build.

Precomputed lighting data
Lighting Data Asset