Spawner
Deciding what appears in a frame and where. Spacing, distributions, clusters and anchors, and the manifest that records what was requested against what was placed.
Spawner overview
What a population is made of, the four placement domains, and the spacing, grounding, collision and orientation contracts.
Spacing and collision
Centre and footprint spacing, grounding policy, collision modes and the attempt budget.
Distributions
Numeric and spatial distributions, and where each one is actually sampled.
Clusters and anchors
Cluster rules, relative anchors, inter-class distances and nested groups.
The spawn manifest
The per-frame record of what was requested, placed and refused, and why it is hashed.