Babylonjs学习笔记(一)——搭建基础场景

React + typescript + umi + Babylonjs 搭建基础场景

yarn add --save babylonjs babylonjs-loaders

1、封装基础场景

import { Engine, Scene } from "babylonjs";
import { useEffect,useRef,FC } from "react";
import "./index.less"

type PropsType = {
  antalias:any;
  engineOptions?:any;
  adaptToDeviceRatio?:any;
  sceneOptions?:any;
  onRender:(scene:Scene)=>void;
  onSceneReady:any;
  [key:string]:any;
}

const BaseScene:FC=(props)=>{
  const {antalias,engineOptions,adaptToDeviceRatio,sceneOptions,onRender,onSceneReady,...rests} = props

  // 获取canvas画布
  const canvasRef = useRef(null);

  useEffect(()=>{

    const {current:canvas} = canvasRef
    if(!canvas)return

    
    // 创建babylonjs 引擎
    const engine = new Engine(canvas,antalias,engineOptions  ,adaptToDeviceRatio);
    // 创建场景
    const scene = new Scene(engine,sceneOptions)
    
    // 搭建场景
    if(scene.isReady()){
      onSceneReady(scene)
    }else{
      scene.onReadyObservable.addOnce((scene)=>onSceneReady(scene))
    }

    // 帧渲染
    engine.runRenderLoop(()=>{
      if(typeof onRender === 'function') onRender?.(scene);
      scene?.render();
    })
    
    const resize=()=>{
      scene.getEngine().resize()
    }
    // 监听画布大小
    if(window){
      window.addEventListener('resize',resize)
    }
    // 销毁
    return ()=>{
      scene.getEngine().dispose()
      if(window){
        window.removeEventListener('resize',resize)
      }
    }
  },[antalias,engineOptions,adaptToDeviceRatio,sceneOptions,onRender,onSceneReady])
  
  return 
}
export default BaseScene

2、封装应用场景

import {  ArcRotateCamera, HemisphericLight, MeshBuilder, Scene,  Vector3 } from "babylonjs";
import 'babylonjs-loaders'
import BaseScene from "./BaseScene";


let box:any;
const onSceneReady=async (scene:Scene)=>{
  
  // 创建相机
  const camera = new ArcRotateCamera('camera',0,0.8,100,Vector3.Zero(),scene)

  // 设置相机目标
  camera.setTarget(Vector3.Zero());

  // 获取画布
  const canvas = scene.getEngine().getRenderingCanvas();

  // 添加控制器
  camera.attachControl(canvas,true);

  // 框架行为
  camera.useFramingBehavior =true;

  // 添加灯光
  const light = new HemisphericLight('light',new Vector3(0,1,0),scene)

  // 设置强度
  light.intensity = 0.7;

  // 创建box
  box = MeshBuilder.CreateBox('box',{size:2},scene)
  box.position.y= 1;

  // 相机目标
  camera.setTarget(box)

  MeshBuilder.CreateGround('ground',{width:6,height:6},scene)
}




const onRender=(scene:Scene)=>{
  if(box !== undefined){
    const deltTime = scene.getEngine().getDeltaTime();

    const rpm = 10;
    box.rotation.y += (rpm / 60) * Math.PI * 2 * (deltTime / 1000);
  }
}

export default ()=>
    

3、应用场景

import BaseScene from '@/components/Robot';
import { PageContainer } from '@ant-design/pro-components';
import styles from './index.less';

const HomePage: React.FC = () => {
  return (
    
      

       
      
    
  );
};

export default HomePage;

4、演示