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概述
如有不明白的可以加QQ：2354528292；wx: aichitudousien
更多教学视频请访问：https://space.bilibili.com/236087412
源码获取： https://item.taobao.com/item.htm?spm=a21dvs.23580594.0.0.3c3a645eIMTaft&ft=t&id=714967503431
经过上一次使用three.js做了个demo，这次使用maptalks+three+vue来继续开发一个demo玩玩
先看视频效果：
[video(video-bvzzjqdd-1615007935063)(type-csdn)(url-https://live.csdn.net/v/embed/156451)(image-https://vedu.csdnimg.cn/92e455d21899461ba223cc19b3530db5/snapshots/47b9fea390504faa91d59a2836f73dde-00002.jpg)(title-maptalks+three 智慧城市)]
搭建开发环境
使用的开发框架是vue-cli3.0, webgl使用three.js，地图使用maptalks，开发工具为vscode
搭建完成后的目录为
搭建maptalks+three场景
和上一个项目初始化场景一样，先创建一个ZThree的类，然后写入一个初始化方法initMapTalks
initMapTalks(option) {
let config = {
center: [113.31915199756622, 23.109087176037534],
zoom: 17,
pitch: 70,
bearing: 180,
centerCross: true,
doubleClickZoom: false,
baseLayer: new maptalks.TileLayer('tile', {
urlTemplate: 'https://{s}.basemaps.cartocdn.com/dark_all/{z}/{x}/{y}.png',
subdomains: ['a', 'b', 'c', 'd']
})
};
option = Object.assign(config, option);
let map = new maptalks.Map(this.id, option);
let threeLayer = new ThreeLayer('t', {
forceRenderOnMoving: true,
forceRenderOnRotating: true
});
threeLayer.addTo(map);
ThreeLayer.prototype.coordinateToXYZ = function (coordinate, height = 0) {
let z = this.distanceToVector3(height, height).x;
let v = this.coordinateToVector3(coordinate, z)
return [v.x, v.y, v.z];
}
return threeLayer;
}
- 实例化类
app = new ZThree("screen");
创建灯光
灯光代码和上次项目的代码一样，在博客中的智慧城市第一篇文章中查找
app.initLight();
此时我们看到的是已经成功创建好了地图
加载建筑模型
- 创建加载模型方法 loadBuilding
export function loadBuilding(threeLayer) {
let features = buildingGeoJosn.features;
let polygons = features.map(f => {
let height = Number(f.properties.height);
let polygon = maptalks.GeoJSON.toGeometry(f);
polygon.setProperties({
height,
});
return polygon;
});
let material = new THREE.ShaderMaterial({
uniforms: bulidingShader.uniforms,
vertexShader: bulidingShader.vs,
fragmentShader: bulidingShader.fs,
side: THREE.DoubleSide,
transparent: true,
})
let mesh = threeLayer.toExtrudePolygons(polygons, {
interactive: false
}, material);
let meshs = [];
let bufferGeometry = mesh.getObject3d().geometry;
let geometry = new THREE.Geometry().fromBufferGeometry(bufferGeometry);
let {
vertices,
faces,
faceVertexUvs
} = geometry;
for (let i = 0, len = faces.length; i < len; i++) {
let {
a,
b,
c
} = faces[i];
let p1 = vertices[a],
p2 = vertices[b],
p3 = vertices[c];
//top face
if (p1.z > 0 && p2.z > 0 && p3.z > 0) {
let uvs = faceVertexUvs[0][i];
for (let j = 0, len1 = uvs.length; j < len1; j++) {
uvs[j].x = 0;
uvs[j].y = 0;
}
}
}
mesh.getObject3d().geometry = new THREE.BufferGeometry().fromGeometry(geometry);
bufferGeometry.dispose();
geometry.dispose();
meshs.push(mesh);
threeLayer.addMesh(meshs);
}
- 在场景中调用此方法数据
loadBuilding(threeLayer);
数据可从此地址获得 https://www.openstreetmap.org/
此时我们可以看到的效果是，用的数据量小的做开发，后期数据自己替换即可
建筑贴图：
加载流光道路
流光道路使用MeshLineMaterial来实现，因为three.js的线条材质是没有宽度的，所以此处我们需要导入一个新的库THREE.MeshLine，当然可以使用管道tube来实现也是可以的，使用管道来实现请查看博客中的流光特效文章
export function loaderRoad(threeLayer, SpriteLine) {
let texture = new THREE.TextureLoader().load('texture/road.png');
texture.anisotropy = 16;
texture.wrapS = THREE.RepeatWrapping;
texture.wrapT = THREE.RepeatWrapping;
let camera = threeLayer.getCamera();
let material = new MeshLineMaterial({
map: texture,
useMap: true,
lineWidth: 13,
sizeAttenuation: false,
transparent: true,
near: camera.near,
far: camera.far
});
let features = roadGeoJosn.features;
let meshs = []
features.forEach(item => {
if (item.geometry.type === 'LineString' && item.properties?.highway === 'primary') {
let line = maptalks.GeoJSON.toGeometry(item);
let mesh = new SpriteLine(line, {
altitude: 0
}, material, threeLayer);
meshs.push(mesh);
}
})
threeLayer.addMesh(meshs);
}
数据来源和建筑的是一个地址，添加好后在场景中引入即可，流光动画只要偏移贴图的uv就好了
此时的效果
道路流光的贴图
加载水系
水系使用Ocean来制作，具体的可以在github上搜索Ocean来看案例
export function loaderWater(threeLayer) {
let polygons = maptalks.GeoJSON.toGeometry(waterGeoJosn);
let oceans = polygons.map(p => {
let ocean = new Ocean(p, {
waterNormals: 'texture/waternormals.jpg'
}, threeLayer)
return ocean;
});
threeLayer.addMesh(oceans);
}
水系的贴图
此时我们看到的效果是
加载大厦模型
模型在网上随便找了一个，勉强能用
加载模型代码
export async function loaderModel(app, threeLayer, position) {
let model = await app.loaderModel(
"model/",
'building'
);
let material = new THREE.ShaderMaterial({
uniforms: modelShader.uniforms,
vertexShader: modelShader.vs,
fragmentShader: modelShader.fs,
side: THREE.DoubleSide,
transparent: true,
})
model.traverse(obj => {
obj.material = material;
obj.scale.set(1.5, 1.5, 1.5);
})
model.position.set(...position);
model.rotateX(Math.PI / 2)
threeLayer.addMesh(model);
return model;
}
模型下载地址：https://download.csdn.net/download/qq_39503511/15611779
加载成功后看到的效果：
加载飞行线条
飞行线条也和上期代码中的开发方式一样的，通过三个点生成贝塞尔曲线，在添加贴图偏移就好了
export function loaderCurve(app, threeLayer, geojson = curve) {
let points = geojson.features.map(item => {
let coordinates = item.geometry.coordinates;
return [new THREE.Vector3(...threeLayer.coordinateToXYZ(coordinates)), new THREE.Vector3(...threeLayer.coordinateToXYZ([-73.98565649986267, 40.74843959459197], 258))]
})
let meshs = []
points.forEach((point, index) => {
let c = point[0].clone().add(point[1].clone()).divideScalar(2);
c.z += 4
let curve = new THREE.QuadraticBezierCurve3(point[0], c, point[1])
let points = curve.getPoints(80)
let line = new THREE.CatmullRomCurve3(points)
let tube = app.loaderTube(
line,
index % 2 === 0 ? tubeRedMaterial : tubeGreenMaterial
);
meshs.push(tube);
})
threeLayer.addMesh(meshs);
}
此时我们看到的效果是
创建圆锥体
export function loaderCone(threeLayer, geojson = cone) {
let points = geojson.features.map(item => {
let coordinates = item.geometry.coordinates;
return threeLayer.coordinateToXYZ(coordinates, 100)
})
let geometry = new THREE.ConeGeometry(0.2, 0.4, 4);
let meshs = []
points.forEach(item => {
let material = new THREE.MeshBasicMaterial({
color: `rgb${rgb()}`,
transparent: true,
opacity: 8,
side: THREE.DoubleSide,
depthWrite: false
});
let cone = new THREE.Mesh(geometry, material);
cone.rotateX(-Math.PI / 2);
cone.position.set(...item);
meshs.push(cone);
});
threeLayer.addMesh(meshs);
return meshs;
}
rgb函数是一个获取随机rbg颜色函数
export function rgb() { //rgb颜色随机
let r = Math.floor(Math.random() * 256);
let g = Math.floor(Math.random() * 256);
let b = Math.floor(Math.random() * 256);
let rgb = '(' + r + ',' + g + ',' + b + ')';
return rgb;
}
此时我们看到场景中的效果是
创建文本
最后再来创建一些基础的文本，使用精灵来创建
export function loaderText(app, threeLayer, geojson = text) {
geojson.features.forEach(item => {
let coordinates = item.geometry.coordinates;
let position = threeLayer.coordinateToXYZ(coordinates, 200);
let name = item.properties.name;
let element = `
<div class="sprite-canvas">
<span class="sprite-layer">${name}</span>
</div>`;
app.addHtmlCanvas({
parent: app.scene,
position,
element
})
})
}
addHtmlCanvas方法在上期已经贴出代码，通过html来生成canvas，然后在map使用就好
此时的效果：
最后我们给整个场景添加一个高光的后期处理就ok了
export function loaderBloom(threeLayer) {
const params = {
exposure: 1,
bloomStrength: 1.5,
bloomThreshold: 0,
bloomRadius: 0,
debug: false
};
const renderer = threeLayer.getThreeRenderer();
const size = threeLayer.getMap().getSize();
threeLayer.composer = new EffectComposer(renderer);
threeLayer.composer.setSize(size.width, size.height);
const scene = threeLayer.getScene(),
camera = threeLayer.getCamera();
threeLayer.renderPass = new RenderPass(scene, camera);
threeLayer.composer.addPass(threeLayer.renderPass);
const bloomPass = threeLayer.bloomPass = new UnrealBloomPass(new THREE.Vector2(size.width, size.height));
bloomPass.renderToScreen = true;
bloomPass.threshold = params.bloomThreshold;
bloomPass.strength = params.bloomStrength;
bloomPass.radius = params.bloomRadius;
threeLayer.composer.addPass(bloomPass);
threeLayer.bloomEnable = true;
threeLayer.getRenderer().renderScene = function () {
const layer = this.layer;
layer._callbackBaseObjectAnimation();
this._syncCamera();
const renderer = this.context,
camera = this.camera,
scene = this.scene;
if (
layer.bloomEnable &&
layer.composer &&
layer.composer.passes.length > 1
) {
layer.composer.render(0);
renderer.clearDepth();
camera.layers.set(0);
renderer.render(scene, camera);
}
this.completeRender();
};
}
ok, 此时我们的整个场景就比之前亮了，我们在替换一下数据就成视频中的效果了
