webgl_modifier_tessellation
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 { TrackballControls } from "three/examples/jsm/controls/TrackballControls.js";
import { TessellateModifier } from "three/examples/jsm/modifiers/TessellateModifier.js";
import { FontLoader } from "three/examples/jsm/loaders/FontLoader.js";
import { TextGeometry } from "three/examples/jsm/geometries/TextGeometry.js";
/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
name: "webgl_modifier_tessellation",
useLoaders: [FontLoader],
info: [
[
{
tag: "a",
link: "https://threejs.org",
content: "three.js"
},
{
tag: "text",
content: "- modifier tessellation"
}
]
],
init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
let renderer, scene, camera, stats;
let controls;
let mesh, uniforms;
const WIDTH = window.innerWidth;
const HEIGHT = window.innerHeight;
const loader = new FontLoader();
loader.load("fonts/helvetiker_bold.typeface.json", function(font) {
init(font);
});
function init(font) {
camera = new THREE.PerspectiveCamera(40, WIDTH / HEIGHT, 1, 1e4);
camera.position.set(-100, 100, 200);
scene = new THREE.Scene();
scene.background = new THREE.Color(328965);
let geometry = new TextGeometry("THREE.JS", {
font,
size: 40,
depth: 5,
curveSegments: 3,
bevelThickness: 2,
bevelSize: 1,
bevelEnabled: true
});
geometry.center();
const tessellateModifier = new TessellateModifier(8, 6);
geometry = tessellateModifier.modify(geometry);
const numFaces = geometry.attributes.position.count / 3;
const colors = new Float32Array(numFaces * 3 * 3);
const displacement = new Float32Array(numFaces * 3 * 3);
const color = new THREE.Color();
for (let f = 0; f < numFaces; f++) {
const index = 9 * f;
const h = 0.2 * Math.random();
const s = 0.5 + 0.5 * Math.random();
const l = 0.5 + 0.5 * Math.random();
color.setHSL(h, s, l);
const d = 10 * (0.5 - Math.random());
for (let i = 0; i < 3; i++) {
colors[index + 3 * i] = color.r;
colors[index + 3 * i + 1] = color.g;
colors[index + 3 * i + 2] = color.b;
displacement[index + 3 * i] = d;
displacement[index + 3 * i + 1] = d;
displacement[index + 3 * i + 2] = d;
}
}
geometry.setAttribute("customColor", new THREE.BufferAttribute(colors, 3));
geometry.setAttribute("displacement", new THREE.BufferAttribute(displacement, 3));
uniforms = {
amplitude: { value: 0 }
};
const shaderMaterial = new THREE.ShaderMaterial({
uniforms,
vertexShader: `
uniform float amplitude;
attribute vec3 customColor;
attribute vec3 displacement;
varying vec3 vNormal;
varying vec3 vColor;
void main() {
vNormal = normal;
vColor = customColor;
vec3 newPosition = position + normal * amplitude * displacement;
gl_Position = projectionMatrix * modelViewMatrix * vec4( newPosition, 1.0 );
}
`,
fragmentShader: `
varying vec3 vNormal;
varying vec3 vColor;
void main() {
const float ambient = 0.4;
vec3 light = vec3( 1.0 );
light = normalize( light );
float directional = max( dot( vNormal, light ), 0.0 );
gl_FragColor = vec4( ( directional + ambient ) * vColor, 1.0 );
}
`
});
mesh = new THREE.Mesh(geometry, shaderMaterial);
scene.add(mesh);
renderer = new THREE.WebGLRenderer({ antialias: true, canvas });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(WIDTH, HEIGHT);
renderer.setAnimationLoop(animate);
controls = new TrackballControls(camera, renderer.domElement);
stats = new Stats(renderer);
window.addEventListener("resize", onWindowResize);
needToDispose(renderer, scene, controls);
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function animate() {
render();
stats.update();
}
function render() {
const time = Date.now() * 1e-3;
uniforms.amplitude.value = 1 + Math.sin(time * 0.5);
controls.update();
renderer.render(scene, camera);
}
}
};
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;