Enlighten が入力光の保存と転送できる解像度を制御します。
Typically this resolution can be slightly lower than the resolution of the realtime lightmap without significantly reducing the final quality, although this depends on the kinds of lighting environments you wish to use. Small, bright light sources will require a higher clusterResolution for Enlighten to capture them accurately.
Cluster resolution is multiplied by the realtime lightmap resolution. A high value means a higher cluster resolution. A value of 1 matches each texel in the realtime lightmap with one input cluster.
Using a very small cluster resolution results in light being smeared across the output texels. Larger values do not significantly increase quality (as they have to be averaged for the final output texel), but can cause unnecessary increases in time and memory footprint.