Interface SpatialIndexPluginOptions<G>

Cell size for the spatial hash grid (default: 64)

Phases to register rebuild systems in (default: ['fixedUpdate', 'postUpdate']).

When both phases are registered, the postUpdate rebuild is automatically skipped on cycles where:

1. The fixedUpdate rebuild already ran this cycle, AND
2. No entity hierarchy exists.

In flat-hierarchy scenes transform-propagation copies localTransform → worldTransform unchanged, so the postUpdate grid would duplicate the fixedUpdate one. The skip is automatic and re-engages once any parent relationship is set, or whenever fixedUpdate doesn't run that cycle (sub-fixed-DT frames).

Edge case: if you write to worldTransform directly between phases without using transform-propagation or entity hierarchy, the auto-skip will leave your writes unindexed. Set phases: ['postUpdate'] explicitly to bypass the auto-skip.

Priority for rebuild systems (default: 2000, before collision)

System group name (default: 'spatialIndex')