webgl_postprocessing_masking
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 { EffectComposer } from "three/examples/jsm/postprocessing/EffectComposer.js";
import { TexturePass } from "three/examples/jsm/postprocessing/TexturePass.js";
import { ClearPass } from "three/examples/jsm/postprocessing/ClearPass.js";
import { ClearMaskPass, MaskPass } from "three/examples/jsm/postprocessing/MaskPass.js";
import { OutputPass } from "three/examples/jsm/postprocessing/OutputPass.js";
/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
name: "webgl_postprocessing_masking",
useLoaders: [],
info: [
[
{
tag: "a",
link: "https://threejs.org",
content: "three.js"
},
{
tag: "text",
content: "- webgl masking postprocessing example"
}
]
],
init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
let camera, composer, renderer;
let box, torus;
init();
function init() {
camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 1e3);
camera.position.z = 10;
const scene1 = new THREE.Scene();
const scene2 = new THREE.Scene();
box = new THREE.Mesh(new THREE.BoxGeometry(4, 4, 4));
scene1.add(box);
torus = new THREE.Mesh(new THREE.TorusGeometry(3, 1, 16, 32));
scene2.add(torus);
renderer = new THREE.WebGLRenderer({ canvas });
renderer.setClearColor(14737632);
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.setAnimationLoop(animate);
renderer.autoClear = false;
const clearPass = new ClearPass();
const clearMaskPass = new ClearMaskPass();
const maskPass1 = new MaskPass(scene1, camera);
const maskPass2 = new MaskPass(scene2, camera);
const texture1 = new THREE.TextureLoader().load(
"textures/758px-Canestra_di_frutta_(Caravaggio).jpg"
);
texture1.colorSpace = THREE.SRGBColorSpace;
texture1.minFilter = THREE.LinearFilter;
const texture2 = new THREE.TextureLoader().load("textures/2294472375_24a3b8ef46_o.jpg");
texture2.colorSpace = THREE.SRGBColorSpace;
const texturePass1 = new TexturePass(texture1);
const texturePass2 = new TexturePass(texture2);
const outputPass = new OutputPass();
const parameters = {
stencilBuffer: true
};
const renderTarget = new THREE.WebGLRenderTarget(
window.innerWidth,
window.innerHeight,
parameters
);
composer = new EffectComposer(renderer, renderTarget);
composer.addPass(clearPass);
composer.addPass(maskPass1);
composer.addPass(texturePass1);
composer.addPass(clearMaskPass);
composer.addPass(maskPass2);
composer.addPass(texturePass2);
composer.addPass(clearMaskPass);
composer.addPass(outputPass);
window.addEventListener("resize", onWindowResize);
needToDispose(renderer, scene1, scene2, composer);
}
function onWindowResize() {
const width = window.innerWidth;
const height = window.innerHeight;
camera.aspect = width / height;
camera.updateProjectionMatrix();
renderer.setSize(width, height);
composer.setSize(width, height);
}
function animate() {
const time = Date.now() * 1e-3 + 6e3;
box.position.x = Math.cos(time / 1.5) * 2;
box.position.y = Math.sin(time) * 2;
box.rotation.x = time;
box.rotation.y = time / 2;
torus.position.x = Math.cos(time) * 2;
torus.position.y = Math.sin(time / 1.5) * 2;
torus.rotation.x = time;
torus.rotation.y = time / 2;
renderer.clear();
composer.render(time);
}
}
};
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;