City-Lifeline-Cockpit/tools/city-massing/build-continuous-city-tileset.mjs

// One REPLACE hierarchy owns far/near coverage. No global independent-tileset handoff.
// Reuses immutable bounded source GLBs; no citywide fine geometry generation.
import assert from 'node:assert/strict'
import { readFileSync, writeFileSync, mkdirSync, existsSync } from 'node:fs'
import { resolve, join, relative } from 'node:path'

const root = resolve('tools/city-massing/city/cad-bim')
const output = join(root, process.argv[2] || 'city-continuous-v5')
assert.ok(!existsSync(join(output, 'tileset.json')), 'use a new deployment generation')
const batches = ['pilot', 'batch-urban8000-dedup', 'batch-urban8000b', 'batch-urban8000c',
    'batch-urban-final', 'batch-urban-tail', 'batch-unfitted-fallback'].map((name) => `lod-${name}-roofed2/streaming-v5`)
// Keep complete coarse coverage and add the surveyed near-estate detail as a
// separate spatial branch; the duplicate-ID guard below prevents overlap.
batches.push('lod-near-estate-pilot-v6/streaming-v14')
if (process.argv[3]) batches.push(process.argv[3])
const bounds = { min: [Infinity, Infinity, Infinity], max: [-Infinity, -Infinity, -Infinity] }
const ids = new Set(), children = [], sources = []
let transform
const sphere = (box) => [...box.slice(0, 3), Math.hypot(box[3], box[7], box[11])]
for (const source of batches) {
    const dir = join(root, source)
    const tree = JSON.parse(readFileSync(join(dir, 'tileset.json'), 'utf8'))
    const manifest = JSON.parse(readFileSync(join(dir, 'manifest.json'), 'utf8'))
    transform ||= tree.root.transform
    assert.deepEqual(tree.root.transform, transform)
    assert.equal(manifest.provenance.closedRoofCaps, true)
    for (const id of manifest.cells.flatMap((c) => c.buildingIds)) {
        assert.ok(!ids.has(id), `duplicate surveyed building ${id}`)
        ids.add(id)
    }
    function adapt(tile) {
        const clone = structuredClone(tile)
        if (tile.content?.uri) clone.content.uri = relative(output, join(dir, tile.content.uri)).replaceAll('\\', '/')
        if (tile.children?.length) {
            // Bounding spheres explicitly disable Cesium's childrenWithinParent box optimization.
            // Otherwise a child outside its narrow request volume can incorrectly cull its coarse parent.
            clone.boundingVolume = { sphere: sphere(tile.boundingVolume.box) }
            clone.geometricError = 1000000 // traversal sentinel, not a measured survey error
            clone.children = tile.children.map(adapt)
        }
        // Keep each coarse content request sphere. Only structural parents and fine GE0
        // tiles may omit it; this lets Cesium retire far coarse partitions by distance while
        // retaining local coarse coverage during fine refinement.
        if (tile.children?.length && !/-lod1\.glb$/.test(tile.content?.uri || '')) delete clone.viewerRequestVolume
        return clone
    }
    children.push(...tree.root.children.map(adapt))
    const box = tree.root.boundingVolume.box
    for (let axis = 0; axis < 3; axis++) {
        bounds.min[axis] = Math.min(bounds.min[axis], box[axis] - box[[3, 7, 11][axis]])
        bounds.max[axis] = Math.max(bounds.max[axis], box[axis] + box[[3, 7, 11][axis]])
    }
    sources.push({ source, count: manifest.count, files: manifest.files.length })
}
const center = bounds.min.map((v, i) => (v + bounds.max[i]) / 2)
const half = bounds.min.map((v, i) => (bounds.max[i] - v) / 2)
const box = [...center, half[0], 0, 0, 0, half[1], 0, 0, 0, half[2]]
mkdirSync(output, { recursive: true })
const anchor = join(root, batches[0], 'root-anchor.glb')
writeFileSync(join(output, 'root-anchor.glb'), readFileSync(anchor))
writeFileSync(join(output, 'tileset.json'), JSON.stringify({ asset: { version: '1.1', generator: 'Continuous surveyed city distance-first REPLACE' },
    geometricError: 1000000, root: { transform, boundingVolume: { box }, geometricError: 1000000,
        refine: 'REPLACE', content: { uri: 'root-anchor.glb' }, children } }, null, 2))
writeFileSync(join(output, 'manifest.json'), JSON.stringify({ buildings: ids.size, sources, boundsENU: bounds,
    policy: 'Continuous bounded LOD1; coarse and fine request spheres are retained for distance-based progressive loading. Fine GE0 uses half-diagonal +250m; coarse uses its source request sphere. Same REPLACE hierarchy; local coarse coverage remains during refinement.',
    closedRoofCaps: true, heightBasedLOD: false }, null, 2))
console.log(JSON.stringify({ output, buildings: ids.size, sources }))