在我使用Openlayer实例创建基础图层和图块层之前，在openlayer中可以选择使用z-index属性来保护索引以在基础图层上显示图块层，但在Mapbox GL中找不到任何z-index属性避免将一层隐藏在另一层后面。
我使用卫星地图作为基础层和一个矢量层，但是覆盖矢量层的卫星基础层和矢量层正在被隐藏。
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<title>Add a 3D model</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.53.1/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.53.1/mapbox-gl.css' rel='stylesheet' />
<style>
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
<script src='https://unpkg.com/[email protected]/build/three.min.js'></script>
<script src="https://unpkg.com/[email protected]/examples/js/loaders/GLTFLoader.js"></script>
<div id='map'></div>
<script>
mapboxgl.accessToken = 'pk.eyJ1IjoibWFwYm94IiwiYSI6ImNpejY4M29iazA2Z2gycXA4N2pmbDZmangifQ.-g_vE53SD2WrJ6tFX7QHmA';
var map = window.map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/satellite-v9',
zoom: 17.5,
center: [148.9819, -35.3981],
pitch: 60
});
// parameters to ensure the model is georeferenced correctly on the map
var modelOrigin = [148.98190, -35.39847];
var modelAltitude = 0;
var modelRotate = [Math.PI / 2, 0, 0];
var modelScale = 5.41843220338983e-8;
// transformation parameters to position, rotate and scale the 3D model onto the map
var modelTransform = {
translateX: mapboxgl.MercatorCoordinate.fromLngLat(modelOrigin, modelAltitude).x,
translateY: mapboxgl.MercatorCoordinate.fromLngLat(modelOrigin, modelAltitude).y,
translateZ: mapboxgl.MercatorCoordinate.fromLngLat(modelOrigin, modelAltitude).z,
rotateX: modelRotate[0],
rotateY: modelRotate[1],
rotateZ: modelRotate[2],
scale: modelScale
};
var THREE = window.THREE;
// configuration of the custom layer for a 3D model per the CustomLayerInterface
var customLayer = {
id: '3d-model',
type: 'custom',
renderingMode: '3d',
onAdd: function(map, gl) {
this.camera = new THREE.Camera();
this.scene = new THREE.Scene();
// create two three.js lights to illuminate the model
var directionalLight = new THREE.DirectionalLight(0xffffff);
directionalLight.position.set(0, -70, 100).normalize();
this.scene.add(directionalLight);
var directionalLight2 = new THREE.DirectionalLight(0xffffff);
directionalLight2.position.set(0, 70, 100).normalize();
this.scene.add(directionalLight2);
// use the three.js GLTF loader to add the 3D model to the three.js scene
var loader = new THREE.GLTFLoader();
loader.load('https://docs.mapbox.com/mapbox-gl-js/assets/34M_17/34M_17.gltf', (function (gltf) {
this.scene.add(gltf.scene);
}).bind(this));
this.map = map;
// use the Mapbox GL JS map canvas for three.js
this.renderer = new THREE.WebGLRenderer({
canvas: map.getCanvas(),
context: gl
});
this.renderer.autoClear = false;
},
render: function(gl, matrix) {
var rotationX = new THREE.Matrix4().makeRotationAxis(new THREE.Vector3(1, 0, 0), modelTransform.rotateX);
var rotationY = new THREE.Matrix4().makeRotationAxis(new THREE.Vector3(0, 1, 0), modelTransform.rotateY);
var rotationZ = new THREE.Matrix4().makeRotationAxis(new THREE.Vector3(0, 0, 1), modelTransform.rotateZ);
var m = new THREE.Matrix4().fromArray(matrix);
var l = new THREE.Matrix4().makeTranslation(modelTransform.translateX, modelTransform.translateY, modelTransform.translateZ)
.scale(new THREE.Vector3(modelTransform.scale, -modelTransform.scale, modelTransform.scale))
.multiply(rotationX)
.multiply(rotationY)
.multiply(rotationZ);
this.camera.projectionMatrix.elements = matrix;
this.camera.projectionMatrix = m.multiply(l);
this.renderer.state.reset();
this.renderer.render(this.scene, this.camera);
this.map.triggerRepaint();
}
};
map.on('style.load', function() {
map.addLayer(customLayer);
});
</script>
</body>
</html>
Mapbox GL JS实际上没有基础层的任何概念，只有层。 addLayer的顺序会影响它们的绘制顺序，或者你可以使用addLayer(layer, before)在另一个图层之前添加图层。