Places the instances of one group of layers (layers sharing a point set) inside one tile. Pure and deterministic: the result depends only on the arguments, so tiles stitch and can be generated in any order (or in a worker).
The group's layers, in priority order. layers[0].spacing sets the point spacing.
layers[0].spacing
Usually groupSeed(scatterSeed, groupName).
(scatterSeed, groupName)
Terrain height; points where it returns NaN are skipped.
One array per layer of INSTANCE_STRIDE floats per instance.
Places the instances of one group of layers (layers sharing a point set) inside one tile. Pure and deterministic: the result depends only on the arguments, so tiles stitch and can be generated in any order (or in a worker).