webgl_instancing_raycast
对应 three.js 示例地址 。
仅需关注 init 函数的内容，其他部分都是示例小程序所使用的描述配置。
js
import * as THREE from "three";
import { OrbitControls } from "three/examples/jsm/controls/OrbitControls.js";
/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
name: "webgl_instancing_raycast",
useLoaders: [],
info: [],
init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
let camera, scene, renderer, controls, stats, gui;
let mesh;
const amount = 20;
const raycaster = new THREE.Raycaster();
const mouse = new THREE.Vector2(1, 1);
const color = new THREE.Color();
const white = new THREE.Color().setHex(16777215);
init();
function init() {
const count = Math.pow(amount, 3);
camera = new THREE.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 0.1, 100);
camera.position.set(amount, amount, amount);
camera.lookAt(0, 0, 0);
scene = new THREE.Scene();
const light = new THREE.HemisphereLight(16777215, 8947848, 3);
light.position.set(0, 1, 0);
scene.add(light);
const geometry = new THREE.IcosahedronGeometry(0.5, 3);
const material = new THREE.MeshPhongMaterial({ color: 16777215 });
mesh = new THREE.InstancedMesh(geometry, material, count);
let i = 0;
const offset = (amount - 1) / 2;
const matrix = new THREE.Matrix4();
for (let x = 0; x < amount; x++) {
for (let y = 0; y < amount; y++) {
for (let z = 0; z < amount; z++) {
matrix.setPosition(offset - x, offset - y, offset - z);
mesh.setMatrixAt(i, matrix);
mesh.setColorAt(i, color);
i++;
}
}
}
scene.add(mesh);
gui = new GUI();
gui.add(mesh, "count", 0, count);
renderer = new THREE.WebGLRenderer({ antialias: true, canvas });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.setAnimationLoop(animate);
controls = new OrbitControls(camera, renderer.domElement);
controls.enableDamping = true;
controls.enableZoom = false;
controls.enablePan = false;
stats = new Stats(renderer);
window.addEventListener("resize", onWindowResize);
canvas.addEventListener("pointermove", onMouseMove);
needToDispose(renderer, scene, controls);
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function onMouseMove(event) {
event.preventDefault();
mouse.x = event.clientX / window.innerWidth * 2 - 1;
mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
}
function animate() {
controls.update();
raycaster.setFromCamera(mouse, camera);
const intersection = raycaster.intersectObject(mesh);
if (intersection.length > 0) {
const instanceId = intersection[0].instanceId;
mesh.getColorAt(instanceId, color);
if (color.equals(white)) {
mesh.setColorAt(instanceId, color.setHex(Math.random() * 16777215));
mesh.instanceColor.needsUpdate = true;
}
}
renderer.render(scene, camera);
stats.update();
}
}
};
export {
exampleInfo as default
};ts
import { Loader, TypedArray } from 'three';
/**
* 官网示例的多端使用封装把版本
* */
export interface OfficialExampleInfo extends MiniProgramMeta {
/*** 示例名称（保持和官网一致）*/
name: string;
/** main */
init: (context: LoadContext) => void;
}
export interface LoadContext {
//为了减少官方代码的改动，实际上等同于 canvas
window: EventTarget & { innerWidth: number; innerHeight: number; devicePixelRatio: number };
/** HTMLCanvasElement */
canvas: any;
/** https://www.npmjs.com/package/lil-gui */
GUI: any;
/**
* https://www.npmjs.com/package/stats.js
* 也可以使用其他受支持的版本
* */
Stats: any;
/** 收集需要 dispose 的对象（官方示例没有处理这部分）*/
needToDispose: (...objs: any[]) => void | ((fromFn: () => any[]) => void);
/**基于 raq 的通用封装 */
useFrame(animateFunc: (/** ms */ delta: number) => void): { cancel: () => void };
/** 显示加载模态框 */
requestLoading(text?: string): Promise<void>;
/** 隐藏加载模态框*/
cancelLoading(): void;
/** 保存文件的通用封装*/
saveFile(
fileName: string,
data: ArrayBuffer | TypedArray | DataView | string
): Promise<string | null>;
/** 示例使用 DracoDecoder 时的资源路径 */
DecoderPath: {
GLTF: string;
STANDARD: string;
};
/** 为资源路径拼上 CDN 前缀 */
withCDNPrefix(path: string): string;
/**
* 在小程序中应使用 import { VideoTexture } from '@minisheep/three-platform-adapter/override/jsm/textures/VideoTexture.js';
* 正常情况（web） 可直接使用 THREE.VideoTexture
* */
getVideoTexture(videoOptions: VideoOptions): Promise<[{ isVideoTexture: true }, video: any]>;
/**
* 在小程序中应使用 import { CameraTexture } from '@minisheep/three-platform-adapter/override/jsm/textures/CameraTexture.js';
* 正常情况（web） 可参考示例 webgl_materials_video_webcam
* */
getCameraTexture(): { isVideoTexture: true };
/** 用于动态修改 info 中的占位符*/
bindInfoText(template: `$${string}$`, initValue?: string): { value: string };
/** 分屏控件对应的事件回调 */
onSlideStart(handle: () => void): void;
/** 分屏控件对应的事件回调 */
onSlideEnd(handle: () => void): void;
/** 分屏控件对应的事件回调 */
onSlideChange(handle: (offset: number, boxSize: number) => void): void;
}
export type VideoOptions = {
src: string;
/** 相当于 HTMLVideoElement 的 naturalWidth (小程序中获取不到)*/
width: number;
/** 相当于 HTMLVideoElement 的 naturalHeight (小程序中获取不到)*/
height: number;
loop?: boolean;
autoplay?: boolean;
muted?: boolean;
};
/** 示例小程序中使用的一些配置 */
export interface MiniProgramMeta {
/** 用于统计加载相关信息 */
useLoaders: Loader[];
/** 通用 info */
info: TagItem[][];
/** 特殊 info */
infoPanel?: {
left?: [string, string][];
right?: [string, string][];
};
/** 分屏控件配置 */
needSlider?: {
/** 方向 */
direction?: 'horizontal' | 'vertical';
/** 初始偏移 0-100 */
initPosition?: number;
};
/** 操作摇杆控件 */
needArrowControls?: boolean;
/** 默认需要的画布类型 */
canvasType?: '2d' | 'webgl' | 'webgl2';
/** 为保持效果一致所需要的画布样式 */
canvasStyle?: {
bgColor?: string;
width?: number | string;
height?: number | string;
};
/** 部分示例需要在加载前进行一些提示 */
initAfterConfirm?: {
/**
* 提示类型
* @default 'default'
* */
type?: 'warning' | 'default';
text: string[];
};
}
export interface BaseTag<T extends string> {
tag: T;
content: string;
}
export interface ATag extends BaseTag<'a'> {
link: string;
}
export type TextTag = BaseTag<'text'>;
export type TagItem = TextTag | ATag;