Lightmap (and lighting) configuration mode, controls how lightmaps interact with lighting and what kind of information they store.
| NonDirectional | Light intensity (no directional information), encoded as 1 lightmap. |
| CombinedDirectional | Directional information for direct light is combined with directional information for indirect light, encoded as 2 lightmaps. |
| SeparateDirectional | Directional information for direct light is stored separately from directional information for indirect light, encoded as 4 lightmaps. |