City-Lifeline-Cockpit/tools/city-massing/prepare-modules.mjs

// Split long source blocks into stepped facade modules without changing street orientation.
import { readFileSync, writeFileSync } from 'node:fs'
import { Cartesian3, Cartographic, Matrix4, Math as CM } from 'cesium'
const file = 'tools/city-massing/district/plan.json',
    p = JSON.parse(readFileSync(file))
const transform = Matrix4.fromArray(p.transform)
const toGeo = (q) => {
    const c = Cartographic.fromCartesian(Matrix4.multiplyByPoint(transform, new Cartesian3(...q), new Cartesian3()))
    return { lon: CM.toDegrees(c.longitude), lat: CM.toDegrees(c.latitude) }
}
const modules = [],
    samples = []
for (const b of p.buildings) {
    const n = b.archetype === 'midrise' ? 1 : Math.max(1, Math.ceil(b.width / (b.archetype === 'house' ? 16 : 28)))
    for (let part = 0; part < n; part++) {
        const width = b.width / n,
            depth = b.depth,
            localOffset = -b.width / 2 + width * (part + 0.5),
            u = [Math.cos(b.heading), Math.sin(b.heading)],
            v = [-u[1], u[0]]
        const center = [b.centerENU[0] + u[0] * localOffset, b.centerENU[1] + u[1] * localOffset, 0]
        const footprint = [
            [-width / 2, -depth / 2],
            [width / 2, -depth / 2],
            [width / 2, depth / 2],
            [-width / 2, depth / 2],
        ].map(([x, y]) => [center[0] + u[0] * x + v[0] * y, center[1] + u[1] * x + v[1] * y, 0])
        const id = b.id + '-part' + part
        const points = []
        const cols = Math.ceil(width / 5),
            rows = Math.ceil(depth / 5)
        for (let y = 0; y <= rows; y++)
            for (let x = 0; x <= cols; x++) {
                let dx = -width / 2 + (width * x) / cols,
                    dy = -depth / 2 + (depth * y) / rows
                points.push(toGeo([center[0] + u[0] * dx + v[0] * dy, center[1] + u[1] * dx + v[1] * dy, 0]))
            }
        const sampleIndices = points.map((a) => {
            samples.push({ ...a, building: id })
            return samples.length - 1
        })
        modules.push({
            id,
            sourceId: b.id,
            source: b.source,
            width,
            depth,
            heading: b.heading,
            centerENU: center,
            footprintENU: footprint,
            center: toGeo(center),
            archetype: b.archetype,
            floors: b.floors,
            part,
            sampleIndices,
        })
    }
}
p.modules = modules
p.samples = samples
writeFileSync(file, JSON.stringify(p, null, 2))
console.log({ sourceBuildings: p.buildings.length, modules: modules.length, samples: samples.length })