HlodSet

new

constructor(options: HlodOptions)

has

has(id: number): boolean

levelOf

levelOf(id: number): number

The level a region is at or arriving at, or HLOD_NONE. -1 for a region not in the set.

add

add(id: number, box: ArrayLike<number>, errors: ArrayLike<number>): void

Add a region: its box as min then max, and one geometric error per level, finest first and never shrinking. It arrives at no level and fades into the one the next select picks.

remove

remove(id: number): void

Remove a region; nothing if it is not there. The last region takes its slot.

select

select(eye: ArrayLike<number>, projectionScale: number, frustum: FrustumPlanes, occluder: BoxOccluder | null, dtSec: number, out: HlodDraws): number

Decide every region's level for this view and write what to draw into out, returning how many draws that is. projectionScale is projectionScaleOf(fov, height); occluder may be the renderer, asked after this frame's occluders are declared.