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Mapbox custom layer which renders multiple models in a THREE.js scene
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import * as THREE from 'three' | |
import { GLTF, GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader' | |
import { setPosition } from '@/components/Mapbox/utils' | |
import MapboxGL, { LngLatLike, MercatorCoordinate } from 'mapbox-gl' | |
import { LayerConfig, ModelTransform } from './types' | |
import { FeatureCollection } from 'geojson' | |
import { Object3D } from 'three' | |
function transform(layerConfig: LayerConfig, modelConfig: { position: LngLatLike; altitude: number }, center: mapboxgl.MercatorCoordinate): THREE.Matrix4 { | |
const { modelScale, modelRotate } = layerConfig | |
const { position, altitude } = modelConfig | |
const rotationX = new THREE.Matrix4().makeRotationAxis(new THREE.Vector3(1, 0, 0), modelRotate[0]) | |
const rotationY = new THREE.Matrix4().makeRotationAxis(new THREE.Vector3(0, 1, 0), modelRotate[1]) | |
const rotationZ = new THREE.Matrix4().makeRotationAxis(new THREE.Vector3(0, 0, 1), modelRotate[2]) | |
const coord = MercatorCoordinate.fromLngLat(position, altitude) | |
const scale = coord.meterInMercatorCoordinateUnits() * (modelScale as number) | |
return new THREE.Matrix4() | |
.makeTranslation(coord.x - center.x, coord.y - center.y, coord.z! - center.z!) | |
.scale(new THREE.Vector3(scale, -scale, scale)) | |
.multiply(rotationX) | |
.multiply(rotationY) | |
.multiply(rotationZ) | |
} | |
class CustomLayer implements MapboxGL.CustomLayerInterface { | |
type = 'custom' as const | |
renderingMode = '3d' as const | |
id: string | |
options: LayerConfig = { | |
path: '', | |
modelRotate: [Math.PI / 2, 0, 0], | |
modelScale: 1 | |
} | |
map!: MapboxGL.Map | |
center!: MapboxGL.MercatorCoordinate | |
camera!: THREE.Camera | |
cameraTransform!: THREE.Matrix4 | |
scene!: THREE.Scene | |
renderer!: THREE.WebGLRenderer | |
model: Promise<GLTF> | |
constructor(id: string, options: LayerConfig) { | |
this.id = id | |
this.options = { ...this.options, ...options } | |
this.model = new Promise<GLTF>((resolve, reject) => { | |
const loader = new GLTFLoader() | |
loader.load( | |
options.path, | |
(gltf: GLTF) => { | |
resolve(gltf) | |
}, | |
() => { | |
// progress is being made; bytes loaded = xhr.loaded / xhr.total | |
}, | |
e => { | |
const xhr = e.target as XMLHttpRequest | |
const message = `Unable to load ${options.path}: ${xhr.status} ${xhr.statusText}` | |
// console.error(message); // tslint:disable-line | |
reject(message) | |
} | |
) | |
}) | |
} | |
createScene() { | |
const scene = new THREE.Scene() | |
const hemiLight = new THREE.HemisphereLight(0xffffff, 0x444444) | |
hemiLight.position.set(0, 20, 0) | |
scene.add(hemiLight) | |
const dirLight = new THREE.DirectionalLight(0xffffff) | |
dirLight.position.set(-3, 10, -10) | |
dirLight.castShadow = true | |
dirLight.shadow.camera.top = 2 | |
dirLight.shadow.camera.bottom = -2 | |
dirLight.shadow.camera.left = -2 | |
dirLight.shadow.camera.right = 2 | |
dirLight.shadow.camera.near = 0.1 | |
dirLight.shadow.camera.far = 40 | |
scene.add(dirLight) | |
if (this.options.hasAxis) { | |
const axesHelper = new THREE.AxesHelper(5) | |
this.scene.add(axesHelper) | |
} | |
return scene | |
} | |
onAdd(map: MapboxGL.Map, gl: WebGLRenderingContext) { | |
this.center = MercatorCoordinate.fromLngLat(map.getCenter(), 0) | |
this.camera = new THREE.Camera() | |
const { x, y, z } = this.center | |
this.cameraTransform = new THREE.Matrix4().makeTranslation(x, y, z || 0) | |
this.scene = this.createScene() | |
this.map = map | |
this.renderer = new THREE.WebGLRenderer({ | |
canvas: map.getCanvas(), | |
context: gl, | |
antialias: true | |
}) | |
this.renderer.autoClear = false | |
} | |
render(gl: WebGLRenderingContext, matrix: number[]) { | |
this.camera.projectionMatrix = new THREE.Matrix4().fromArray(matrix).multiply(this.cameraTransform) | |
// const l = setPosition(this.modelTransform) | |
// this.camera.projectionMatrix = new THREE.Matrix4().fromArray(matrix).multiply(l) | |
this.renderer.resetState() | |
this.renderer.render(this.scene, this.camera) | |
this.map.triggerRepaint() | |
} | |
async addFeatures(geojson: FeatureCollection, callback: (objects: Object3D[], scene: THREE.Scene) => void | undefined) { | |
const model = await this.model | |
this.scene = this.createScene() | |
const objects = geojson.features.map(f => { | |
const { geometry } = f | |
if (geometry.type !== 'Point') { | |
throw new Error(`Sprite layers must have Point geometries; got ${f.geometry.type}`) | |
} | |
const { coordinates } = geometry | |
const object = model.scene.clone() | |
object.applyMatrix4( | |
transform( | |
this.options, | |
{ | |
position: { | |
lng: coordinates[0], | |
lat: coordinates[1] | |
}, | |
altitude: 0 | |
}, | |
this.center | |
) | |
) | |
return object | |
}) | |
if (typeof callback === 'function') { | |
callback(objects, this.scene) | |
} else { | |
for (const o of objects) { | |
this.scene.add(o) | |
} | |
} | |
} | |
} |
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How to use the js?