webgl_buffergeometry_instancing_interleaved
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";
/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
name: "webgl_buffergeometry_instancing_interleaved",
useLoaders: [],
info: [
[
{
tag: "a",
link: "https://threejs.org",
content: "three.js"
},
{
tag: "text",
content: "- indexed instancing (single box), interleaved buffers"
}
]
],
init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
let stats;
let camera, scene, renderer, mesh;
const instances = 5e3;
let lastTime = 0;
const moveQ = new THREE.Quaternion(0.5, 0.5, 0.5, 0).normalize();
const tmpQ = new THREE.Quaternion();
const tmpM = new THREE.Matrix4();
const currentM = new THREE.Matrix4();
init();
function init() {
camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 1e3);
scene = new THREE.Scene();
scene.background = new THREE.Color(1052688);
const geometry = new THREE.InstancedBufferGeometry();
const vertexBuffer = new THREE.InterleavedBuffer(
new Float32Array([
// Front
-1,
1,
1,
0,
0,
0,
0,
0,
1,
1,
1,
0,
1,
0,
0,
0,
-1,
-1,
1,
0,
0,
1,
0,
0,
1,
-1,
1,
0,
1,
1,
0,
0,
// Back
1,
1,
-1,
0,
1,
0,
0,
0,
-1,
1,
-1,
0,
0,
0,
0,
0,
1,
-1,
-1,
0,
1,
1,
0,
0,
-1,
-1,
-1,
0,
0,
1,
0,
0,
// Left
-1,
1,
-1,
0,
1,
1,
0,
0,
-1,
1,
1,
0,
1,
0,
0,
0,
-1,
-1,
-1,
0,
0,
1,
0,
0,
-1,
-1,
1,
0,
0,
0,
0,
0,
// Right
1,
1,
1,
0,
1,
0,
0,
0,
1,
1,
-1,
0,
1,
1,
0,
0,
1,
-1,
1,
0,
0,
0,
0,
0,
1,
-1,
-1,
0,
0,
1,
0,
0,
// Top
-1,
1,
1,
0,
0,
0,
0,
0,
1,
1,
1,
0,
1,
0,
0,
0,
-1,
1,
-1,
0,
0,
1,
0,
0,
1,
1,
-1,
0,
1,
1,
0,
0,
// Bottom
1,
-1,
1,
0,
1,
0,
0,
0,
-1,
-1,
1,
0,
0,
0,
0,
0,
1,
-1,
-1,
0,
1,
1,
0,
0,
-1,
-1,
-1,
0,
0,
1,
0,
0
]),
8
);
const positions = new THREE.InterleavedBufferAttribute(vertexBuffer, 3, 0);
geometry.setAttribute("position", positions);
const uvs = new THREE.InterleavedBufferAttribute(vertexBuffer, 2, 4);
geometry.setAttribute("uv", uvs);
const indices = new Uint16Array([
0,
2,
1,
2,
3,
1,
4,
6,
5,
6,
7,
5,
8,
10,
9,
10,
11,
9,
12,
14,
13,
14,
15,
13,
16,
17,
18,
18,
17,
19,
20,
21,
22,
22,
21,
23
]);
geometry.setIndex(new THREE.BufferAttribute(indices, 1));
const material = new THREE.MeshBasicMaterial();
material.map = new THREE.TextureLoader().load("textures/crate.gif");
material.map.colorSpace = THREE.SRGBColorSpace;
material.map.flipY = false;
const matrix = new THREE.Matrix4();
const offset = new THREE.Vector3();
const orientation = new THREE.Quaternion();
const scale = new THREE.Vector3(1, 1, 1);
let x, y, z, w;
mesh = new THREE.InstancedMesh(geometry, material, instances);
for (let i = 0; i < instances; i++) {
x = Math.random() * 100 - 50;
y = Math.random() * 100 - 50;
z = Math.random() * 100 - 50;
offset.set(x, y, z).normalize();
offset.multiplyScalar(5);
offset.set(x + offset.x, y + offset.y, z + offset.z);
x = Math.random() * 2 - 1;
y = Math.random() * 2 - 1;
z = Math.random() * 2 - 1;
w = Math.random() * 2 - 1;
orientation.set(x, y, z, w).normalize();
matrix.compose(offset, orientation, scale);
mesh.setMatrixAt(i, matrix);
}
scene.add(mesh);
renderer = new THREE.WebGLRenderer({ canvas });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.setAnimationLoop(animate);
stats = new Stats(renderer);
window.addEventListener("resize", onWindowResize);
needToDispose(renderer, scene);
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function animate() {
const time = Date.now();
mesh.rotation.y = time * 5e-5;
const delta = (time - lastTime) / 5e3;
tmpQ.set(moveQ.x * delta, moveQ.y * delta, moveQ.z * delta, 1).normalize();
tmpM.makeRotationFromQuaternion(tmpQ);
for (let i = 0, il = instances; i < il; i++) {
mesh.getMatrixAt(i, currentM);
currentM.multiply(tmpM);
mesh.setMatrixAt(i, currentM);
}
mesh.instanceMatrix.needsUpdate = true;
mesh.computeBoundingSphere();
lastTime = time;
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;