For efficient Enlighten lighting, it's important to find a balance between lighting accuracy and cost. See the beginner tutorials for more information.

Bounce resolution

For actors with Contribute Lightmap and Contribute Probe lighting mode, you can change the Enlighten Quality. This determines the resolution of Enlighten bounce.

High provides a good balance between accuracy and cost for a human scale interior. This is the default for static meshes.

Choose Medium for open exterior areas. This is the default for Landscape, and the default for all meshes when World Partition is enabled.

Choose Low or Background for distant or unimportant objects.

When you select Use Default, the actor uses the Enlighten Quality from its static mesh asset. If the static mesh asset is also set to Use Default, the actor uses the Default Quality set in the level properties.

To use a different resolution for part of a Landscape actor, use the Landscape tool Manage Mode (Unreal Engine Documentation) to move components into a different level, then change the Enlighten Quality of the Landscape Streaming Proxy actor.

Lightmap resolution

For actors with Contribute Lightmap lighting mode, the size of a lightmap pixel determines the resolution of indirect lighting.

If you specify a smaller lightmap pixel size for an actor, Enlighten produces more lightmap pixels for each chart. Each Enlighten Quality preset also determines the lightmap pixel size.

Probe resolution

For actors with Probe or Contribute Probe lighting mode, the minimum spacing between probes determines the resolution of indirect lighting.

To set the maximum resolution of the probe grid for the entire world, change the Adaptive Probe Grid Spacing in the world properties.

You can control the resolution at which probes are automatically placed. Use the Adaptive Probe Resolution in the level properties to set the default probe resolution for the level.

You can also set the Adaptive Probe Resolution for:

a static actor which is lit using probes
an Adaptive Probe Volume actor

When the Adaptive Probe Resolution property for an actor is Use Default, it uses the default probe resolution for the level.

Resolution grid

When World Partition is enabled, the world is divided into a grid and you can specify the lighting resolution for each grid cell. The Enlighten Quality or Probe Resolution value of each cell is applied to actors within the cell which have Enlighten Quality or Adaptive Probe Resolution set to Use Default.

To change the size of the grid cells, use Enlighten Resolution Cell Size in the world properties. All existing cell resolution values are cleared when the cell size is modified.

With an actor selected, use the Set Cell Quality or Set Cell Probe Resolution menus to assign a lighting resolution for the cell that contains the selected actor.

The Computed Quality and Computed Probe Resolution properties show the source of the lighting resolution value:

World: The resolution was not specified for the actor, or its containing cell.
Cell: The resolution was not specified for the actor, but was specified for its containing cell.
Actor: The resolution was specified for the actor.

You can view and edit the lighting resolution in the World Partition window. Switch to the Enlighten Quality or Enlighten Probe Resolution mode and zoom in until the "Zoom In" text is no longer shown at the bottom left. Cells which have been assigned a lighting resolution value are visible.

Drag a box, right-click and choose Set Quality From Selection or Set Probe Resolution From Selection to assign a lighting resolution for all cells intersected by the selection. To clear the resolution value of the cells, choose Use Default.