The Pixel Viewer allows you to see what clusters in the scene contribute to a pixel or probe.

Note that despite the slightly confusing name, the "Pixel Viewer" is applicable to both lightmap pixels and probeset probes.

However, the Pixel Viewer tab that allows you to display runtime buckets and precomp buckets separately only applies to pixel selection, as the runtime/precomp bucket distinction does not exist for probesets.

It also allows you to see the bucket that a pixel or probe belongs to, and what other pixels/probes are in that bucket. Buckets are a collection of pixels/probes that see the same clusters and are compressed together. If the Enlighten quality parameters are very agressive, the lighting for a pixel or probe will be dependent on what bucket it belongs to.

To select a pixel in your scene, enable Pixel Viewer (in the Rendering tab), then right click on a mesh and choose Select pixel. The selected pixel will flash in white and other pixels in the same bucket will flash in pink.

To select a probe in your scene, enable Pixel Viewer and ProbeSets, then left-click on a probe in your mesh. The selected probe will flash in white and other probes in the same bucket will flash in pink.

When a specific pixel or probe is selected, the Input form factors renderer mode will be affected by the current selection.

Various rendering modes can be further enabled in the "Input form factors" tab and work as follows.

False colour	Colours each cluster the pixel or probe can see in a pseudo-random colour.
Lighting	Shows the input lighting of each cluster that the pixel or probe can see.
Form factor	Shows how much each cluster contributes to the selected pixel or probe.
Filter cut level	Filters the clusters to only show clusters on a specified depth in the hierarchical tree of clusters.

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