Before we configure the level for Enlighten, we need to create the Enlighten lightmap UVs. 

We could run the Enlighten precompute to do this, as in the tutorial See what Enlighten can do in Unreal. However, as we haven't configured this level to make best use of Enlighten yet, running a full precompute would take a long time. This is because the default configuration uses full resolution lightmaps, and includes everything in the radiosity computation.

Instead, we'll run the Enlighten parameterize. This is a cut-down version of the Enlighten precompute which enables Enlighten visualizations and checks for errors.

1. From the Build menu, select Build Enlighten > Parameterize > All Levels.
   

   The Re-run option in the Build menu reruns the last Enlighten operation.

   The GeoPrecompMonitor window opens to show the precompute progress.
   

   If Incredibuild is already installed, the Incredibuild monitor window opens instead. 

   A notification shows that the Enlighten precompute is running.

   

   You can still use the editor while the precompute runs.

2. When the precompute is finished, the result is applied automatically after 10 seconds. Alternatively, click Apply Now.
   

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• 3. Understand lightmap efficiency