webgl_geometry_terrain
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 { FirstPersonControls } from "three/examples/jsm/controls/FirstPersonControls.js";
import { ImprovedNoise } from "three/examples/jsm/math/ImprovedNoise.js";
/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
name: "webgl_geometry_terrain",
useLoaders: [],
needArrowControls: true,
info: [
[
{ tag: "a", link: "https://threejs.org", content: "three.js" },
{ tag: "text", content: "- webgl terrain + fog demo" }
],
[{ tag: "text", content: "(left click: forward, right click: backward)" }]
],
init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
let stats;
let camera, controls, scene, renderer;
let mesh, texture;
const worldWidth = 256, worldDepth = 256;
const clock = new THREE.Clock();
init();
function init() {
camera = new THREE.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 1, 1e4);
scene = new THREE.Scene();
scene.background = new THREE.Color(15716789);
scene.fog = new THREE.FogExp2(15716789, 25e-4);
const data = generateHeight(worldWidth, worldDepth);
camera.position.set(100, 800, -800);
camera.lookAt(-100, 810, -800);
const geometry = new THREE.PlaneGeometry(7500, 7500, worldWidth - 1, worldDepth - 1);
geometry.rotateX(-Math.PI / 2);
const vertices = geometry.attributes.position.array;
for (let i = 0, j = 0, l = vertices.length; i < l; i++, j += 3) {
vertices[j + 1] = data[i] * 10;
}
texture = new THREE.CanvasTexture(generateTexture(data, worldWidth, worldDepth));
texture.wrapS = THREE.ClampToEdgeWrapping;
texture.wrapT = THREE.ClampToEdgeWrapping;
texture.colorSpace = THREE.SRGBColorSpace;
mesh = new THREE.Mesh(geometry, new THREE.MeshBasicMaterial({ map: texture }));
scene.add(mesh);
renderer = new THREE.WebGLRenderer({ canvas });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.setAnimationLoop(animate);
controls = new FirstPersonControls(camera, renderer.domElement);
controls.movementSpeed = 150;
controls.lookSpeed = 0.1;
stats = new Stats(renderer);
window.addEventListener("resize", onWindowResize);
needToDispose(controls, renderer, scene);
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
controls.handleResize();
}
function generateHeight(width, height) {
let seed = Math.PI / 4;
Math.random = function() {
const x = Math.sin(seed++) * 1e4;
return x - Math.floor(x);
};
const size = width * height, data = new Uint8Array(size);
const perlin = new ImprovedNoise(), z = Math.random() * 100;
let quality = 1;
for (let j = 0; j < 4; j++) {
for (let i = 0; i < size; i++) {
const x = i % width, y = ~~(i / width);
data[i] += Math.abs(perlin.noise(x / quality, y / quality, z) * quality * 1.75);
}
quality *= 5;
}
return data;
}
function generateTexture(data, width, height) {
let context, image, imageData, shade;
const vector3 = new THREE.Vector3(0, 0, 0);
const sun = new THREE.Vector3(1, 1, 1);
sun.normalize();
const canvas2 = document.createElement("canvas");
canvas2.width = width;
canvas2.height = height;
context = canvas2.getContext("2d");
context.fillStyle = "#000";
context.fillRect(0, 0, width, height);
image = context.getImageData(0, 0, canvas2.width, canvas2.height);
imageData = image.data;
for (let i = 0, j = 0, l = imageData.length; i < l; i += 4, j++) {
vector3.x = data[j - 2] - data[j + 2];
vector3.y = 2;
vector3.z = data[j - width * 2] - data[j + width * 2];
vector3.normalize();
shade = vector3.dot(sun);
imageData[i] = (96 + shade * 128) * (0.5 + data[j] * 7e-3);
imageData[i + 1] = (32 + shade * 96) * (0.5 + data[j] * 7e-3);
imageData[i + 2] = shade * 96 * (0.5 + data[j] * 7e-3);
}
context.putImageData(image, 0, 0);
const canvasScaled = document.createElement("canvas");
canvasScaled.width = width * 4;
canvasScaled.height = height * 4;
context = canvasScaled.getContext("2d");
context.scale(4, 4);
context.drawImage(canvas2, 0, 0);
image = context.getImageData(0, 0, canvasScaled.width, canvasScaled.height);
imageData = image.data;
for (let i = 0, l = imageData.length; i < l; i += 4) {
const v = ~~(Math.random() * 5);
imageData[i] += v;
imageData[i + 1] += v;
imageData[i + 2] += v;
}
context.putImageData(image, 0, 0);
return canvasScaled;
}
function animate() {
render();
stats.update();
}
function render() {
controls.update(clock.getDelta());
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;