1.demo效果
如上图，该demo通过PDBLoader加载了PDB格式的模型，将分子结构模型呈现在页面中
2.实现要点
2.1 PDB模型放置路径
vue中加载文件时默认的路径为public下，所以需要加载的文件放在该路径下，同时在vue的data属性中创建变量publicPath，此变量的值是vue中的环境变量process.env.BASE_URL
data() {
return {
publicPath: process.env.BASE_URL
}
}
2.2 加载PDB模型
这我们通过PDBLoader导入模型，不过这里需要注意导入的路径，把我们创建的publicpath变量拼接到文件的路径上，在导入的回调函数中可以进行相关处理具体如下：
const loader = new PDBLoader()
loader.load(`${
THIS.publicPath}models/aspirin.pdb`, model => {
//对导入模型进行相关处理
...
})
2.3 处理分子顶点
// 获取分子位置分量数组
const atomsPositionArray = model.geometryAtoms.attributes.position.array
// 获取分子颜色分量数组
const colors = model.geometryAtoms.attributes.color.array
// 每三个分量确定一个顶点
for (let i = 0; i < atomsPositionArray.length; i += 3) {
const sphere = new THREE.SphereGeometry(0.2)
// 根据颜色分量确定顶点颜色
const material = new THREE.MeshPhongMaterial({
color: new THREE.Color(colors[i], colors[i + 1], colors[i + 2])
})
const mesh = new THREE.Mesh(sphere, material)
// 根据位置分量确定顶点颜色
mesh.position.set(
atomsPositionArray[i],
atomsPositionArray[i + 1],
atomsPositionArray[i + 2]
)
this.group.add(mesh)
}
2.4 处理分子连线
// 获取连线顶点位置分量数组
const bondsPositionArray = model.geometryBonds.attributes.position.array
// 每六个分量确定两个顶点，两个顶点建立一条连线
for (let i = 0; i < bondsPositionArray.length; i += 6) {
const onePoint = new THREE.Vector3(
bondsPositionArray[i],
bondsPositionArray[i + 1],
bondsPositionArray[i + 2]
)
const otherPoint = new THREE.Vector3(
bondsPositionArray[i + 3],
bondsPositionArray[i + 4],
bondsPositionArray[i + 5]
)
//使用两个顶点创建样条曲线
const path = new THREE.CatmullRomCurve3([onePoint, otherPoint])
//根据样条曲线路径创建管道几何体
const tube = new THREE.TubeGeometry(path, 1, 0.04)
const material = new THREE.MeshPhongMaterial({
color: 0xcccccc })
const mesh = new THREE.Mesh(tube, material)
this.group.add(mesh)
}
3.demo代码
<template>
<div>
<div id="container"></div>
</div>
</template>
<script>
import * as THREE from 'three'
import {
OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js'
import {
PDBLoader } from 'three/examples/jsm/loaders/PDBLoader.js'
export default {
data() {
return {
publicPath: process.env.BASE_URL,
group: null,
camera: null,
scene: null,
renderer: null,
controls: null
}
},
mounted() {
this.init()
},
methods: {
// 初始化
init() {
this.createScene() // 创建场景
this.loadPDB() // 加载PDB模型
this.createLight() // 创建光源
this.createCamera() // 创建相机
this.createRender() // 创建渲染器
this.createControls() // 创建控件对象
this.render() // 渲染
},
// 创建场景
createScene() {
this.scene = new THREE.Scene()
},
// 加载PDB模型
loadPDB() {
const THIS = this
const loader = new PDBLoader()
this.group = new THREE.Group()
loader.load(`${
THIS.publicPath}models/aspirin.pdb`, model => {
// 获取分子位置分量数组
const atomsPositionArray = model.geometryAtoms.attributes.position.array
// 获取分子颜色分量数组
const colors = model.geometryAtoms.attributes.color.array
// 每三个分量确定一个顶点
for (let i = 0; i < atomsPositionArray.length; i += 3) {
const sphere = new THREE.SphereGeometry(0.2)
// 根据颜色分量确定顶点颜色
const material = new THREE.MeshPhongMaterial({
color: new THREE.Color(colors[i], colors[i + 1], colors[i + 2])
})
const mesh = new THREE.Mesh(sphere, material)
// 根据位置分量确定顶点颜色
mesh.position.set(
atomsPositionArray[i],
atomsPositionArray[i + 1],
atomsPositionArray[i + 2]
)
this.group.add(mesh)
}
// 获取连线顶点位置分量数组
const bondsPositionArray = model.geometryBonds.attributes.position.array
// 每六个分量确定两个顶点，两个顶点建立一条连线
for (let i = 0; i < bondsPositionArray.length; i += 6) {
const onePoint = new THREE.Vector3(
bondsPositionArray[i],
bondsPositionArray[i + 1],
bondsPositionArray[i + 2]
)
const otherPoint = new THREE.Vector3(
bondsPositionArray[i + 3],
bondsPositionArray[i + 4],
bondsPositionArray[i + 5]
)
//使用两个顶点创建样条曲线
const path = new THREE.CatmullRomCurve3([onePoint, otherPoint])
//根据样条曲线路径创建管道几何体
const tube = new THREE.TubeGeometry(path, 1, 0.04)
const material = new THREE.MeshPhongMaterial({
color: 0xcccccc })
const mesh = new THREE.Mesh(tube, material)
this.group.add(mesh)
}
this.scene.add(this.group)
})
},
// 创建光源
createLight() {
// 环境光
const ambientLight = new THREE.AmbientLight(0xffffff, 0.1) // 创建环境光
this.scene.add(ambientLight) // 将环境光添加到场景
const spotLight = new THREE.SpotLight(0xffffff) // 创建聚光灯
spotLight.position.set(50, 50, 50)
spotLight.castShadow = true
this.scene.add(spotLight)
},
// 创建相机
createCamera() {
const element = document.getElementById('container')
const width = element.clientWidth // 窗口宽度
const height = element.clientHeight // 窗口高度
const k = width / height // 窗口宽高比
// PerspectiveCamera( fov, aspect, near, far )
this.camera = new THREE.PerspectiveCamera(35, k, 0.1, 1000)
this.camera.position.set(8, 8, 8) // 设置相机位置
this.camera.lookAt(new THREE.Vector3(0, 0, 0)) // 设置相机方向
this.scene.add(this.camera)
},
// 创建渲染器
createRender() {
const element = document.getElementById('container')
this.renderer = new THREE.WebGLRenderer({
antialias: true, alpha: true })
this.renderer.setSize(element.clientWidth, element.clientHeight) // 设置渲染区域尺寸
this.renderer.shadowMap.enabled = true // 显示阴影
this.renderer.shadowMap.type = THREE.PCFSoftShadowMap
this.renderer.setClearColor(0x3f3f3f, 1) // 设置背景颜色
element.appendChild(this.renderer.domElement)
},
render() {
if (this.group) {
this.group.rotation.y += 0.006
this.group.rotation.x += 0.006
}
this.renderer.render(this.scene, this.camera)
requestAnimationFrame(this.render)
},
// 创建控件对象
createControls() {
this.controls = new OrbitControls(this.camera, this.renderer.domElement)
}
}
}
</script>
<style>
#container {
position: absolute;
width: 100%;
height: 100%;
}
</style>