webgl_raycaster_texture
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_raycaster_texture",
useLoaders: [],
info: [
[
{
tag: "a",
link: "https://threejs.org",
content: "three.js"
},
{
tag: "text",
content: "raycaster - texture"
}
]
],
init: ({
window,
canvas: rendererCanvas,
GUI,
Stats,
needToDispose,
useFrame,
withCDNPrefix
}) => {
const WRAPPING = {
RepeatWrapping: THREE.RepeatWrapping,
ClampToEdgeWrapping: THREE.ClampToEdgeWrapping,
MirroredRepeatWrapping: THREE.MirroredRepeatWrapping
};
const params = {
wrapS: THREE.RepeatWrapping,
wrapT: THREE.RepeatWrapping,
offsetX: 0,
offsetY: 0,
repeatX: 1,
repeatY: 1,
rotation: 0
};
function CanvasTexture(parentTexture) {
this._canvas = document.createElement("canvas");
this._canvas.width = this._canvas.height = 1024;
this._context2D = this._canvas.getContext("2d");
if (parentTexture) {
this._parentTexture.push(parentTexture);
parentTexture.image = this._canvas;
}
const that = this;
this._background = document.createElement("img");
this._background.addEventListener("load", function() {
that._canvas.width = that._background.naturalWidth;
that._canvas.height = that._background.naturalHeight;
that._crossRadius = Math.ceil(Math.min(that._canvas.width, that._canvas.height / 30));
that._crossMax = Math.ceil(0.70710678 * that._crossRadius);
that._crossMin = Math.ceil(that._crossMax / 10);
that._crossThickness = Math.ceil(that._crossMax / 10);
that._draw();
});
this._background.crossOrigin = "";
this._background.src = withCDNPrefix("textures/uv_grid_opengl.jpg");
this._draw();
}
CanvasTexture.prototype = {
constructor: CanvasTexture,
_canvas: null,
_context2D: null,
_xCross: 0,
_yCross: 0,
_crossRadius: 57,
_crossMax: 40,
_crossMin: 4,
_crossThickness: 4,
_parentTexture: [],
addParent: function(parentTexture) {
if (this._parentTexture.indexOf(parentTexture) === -1) {
this._parentTexture.push(parentTexture);
parentTexture.image = this._canvas;
}
},
setCrossPosition: function(x, y) {
this._xCross = x * this._canvas.width;
this._yCross = y * this._canvas.height;
this._draw();
},
_draw: function() {
if (!this._context2D) return;
this._context2D.clearRect(0, 0, this._canvas.width, this._canvas.height);
this._context2D.drawImage(this._background, 0, 0);
this._context2D.lineWidth = this._crossThickness * 3;
this._context2D.strokeStyle = "#FFFF00";
this._context2D.beginPath();
this._context2D.moveTo(
this._xCross - this._crossMax - 2,
this._yCross - this._crossMax - 2
);
this._context2D.lineTo(this._xCross - this._crossMin, this._yCross - this._crossMin);
this._context2D.moveTo(this._xCross + this._crossMin, this._yCross + this._crossMin);
this._context2D.lineTo(
this._xCross + this._crossMax + 2,
this._yCross + this._crossMax + 2
);
this._context2D.moveTo(
this._xCross - this._crossMax - 2,
this._yCross + this._crossMax + 2
);
this._context2D.lineTo(this._xCross - this._crossMin, this._yCross + this._crossMin);
this._context2D.moveTo(this._xCross + this._crossMin, this._yCross - this._crossMin);
this._context2D.lineTo(
this._xCross + this._crossMax + 2,
this._yCross - this._crossMax - 2
);
this._context2D.stroke();
for (let i = 0; i < this._parentTexture.length; i++) {
this._parentTexture[i].needsUpdate = true;
}
}
};
const width = window.innerWidth;
const height = window.innerHeight;
let canvas;
let planeTexture, cubeTexture, circleTexture;
let camera, scene, renderer;
const raycaster = new THREE.Raycaster();
const mouse = new THREE.Vector2();
const onClickPosition = new THREE.Vector2();
init();
function init() {
scene = new THREE.Scene();
scene.background = new THREE.Color(15658734);
camera = new THREE.PerspectiveCamera(45, width / height, 1, 1e3);
camera.position.x = -30;
camera.position.y = 40;
camera.position.z = 50;
camera.lookAt(scene.position);
renderer = new THREE.WebGLRenderer({ canvas: rendererCanvas });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(width, height);
renderer.setAnimationLoop(animate);
cubeTexture = new THREE.Texture(
void 0,
THREE.UVMapping,
THREE.RepeatWrapping,
THREE.RepeatWrapping
);
cubeTexture.colorSpace = THREE.SRGBColorSpace;
canvas = new CanvasTexture(cubeTexture);
const cubeMaterial = new THREE.MeshBasicMaterial({ map: cubeTexture });
const cubeGeometry = new THREE.BoxGeometry(20, 20, 20);
let uvs = cubeGeometry.attributes.uv.array;
for (let i = 0; i < uvs.length; i++) {
uvs[i] *= 2;
}
const cube = new THREE.Mesh(cubeGeometry, cubeMaterial);
cube.position.x = 4;
cube.position.y = -5;
cube.position.z = 0;
scene.add(cube);
planeTexture = new THREE.Texture(
void 0,
THREE.UVMapping,
THREE.MirroredRepeatWrapping,
THREE.MirroredRepeatWrapping
);
planeTexture.colorSpace = THREE.SRGBColorSpace;
canvas.addParent(planeTexture);
const planeMaterial = new THREE.MeshBasicMaterial({ map: planeTexture });
const planeGeometry = new THREE.PlaneGeometry(25, 25, 1, 1);
uvs = planeGeometry.attributes.uv.array;
for (let i = 0; i < uvs.length; i++) {
uvs[i] *= 2;
}
const plane = new THREE.Mesh(planeGeometry, planeMaterial);
plane.position.x = -16;
plane.position.y = -5;
plane.position.z = 0;
scene.add(plane);
circleTexture = new THREE.Texture(
void 0,
THREE.UVMapping,
THREE.RepeatWrapping,
THREE.RepeatWrapping
);
circleTexture.colorSpace = THREE.SRGBColorSpace;
canvas.addParent(circleTexture);
const circleMaterial = new THREE.MeshBasicMaterial({ map: circleTexture });
const circleGeometry = new THREE.CircleGeometry(25, 40, 0, Math.PI * 2);
uvs = circleGeometry.attributes.uv.array;
for (let i = 0; i < uvs.length; i++) {
uvs[i] = (uvs[i] - 0.25) * 2;
}
const circle = new THREE.Mesh(circleGeometry, circleMaterial);
circle.position.x = 24;
circle.position.y = -5;
circle.position.z = 0;
scene.add(circle);
window.addEventListener("resize", onWindowResize);
rendererCanvas.addEventListener("pointermove", onMouseMove);
const gui = new GUI();
gui.title("Circle Texture Settings");
gui.add(params, "wrapS", WRAPPING).onChange(setwrapS);
gui.add(params, "wrapT", WRAPPING).onChange(setwrapT);
gui.add(params, "offsetX", 0, 5);
gui.add(params, "offsetY", 0, 5);
gui.add(params, "repeatX", 0, 5);
gui.add(params, "repeatY", 0, 5);
gui.add(params, "rotation", 0, 2 * Math.PI);
gui.open();
needToDispose(renderer, scene);
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function onMouseMove(evt) {
evt.preventDefault();
const array = getMousePosition(rendererCanvas, evt.clientX, evt.clientY);
onClickPosition.fromArray(array);
const intersects = getIntersects(onClickPosition, scene.children);
if (intersects.length > 0 && intersects[0].uv) {
const uv = intersects[0].uv;
intersects[0].object.material.map.transformUv(uv);
canvas.setCrossPosition(uv.x, uv.y);
}
}
function getMousePosition(dom, x, y) {
const rect = dom.getBoundingClientRect();
return [(x - rect.left) / rect.width, (y - rect.top) / rect.height];
}
function getIntersects(point, objects) {
mouse.set(point.x * 2 - 1, -(point.y * 2) + 1);
raycaster.setFromCamera(mouse, camera);
return raycaster.intersectObjects(objects, false);
}
function animate() {
circleTexture.offset.x = params.offsetX;
circleTexture.offset.y = params.offsetY;
circleTexture.repeat.x = params.repeatX;
circleTexture.repeat.y = params.repeatY;
circleTexture.rotation = params.rotation;
renderer.render(scene, camera);
}
function setwrapS(value) {
circleTexture.wrapS = value;
circleTexture.needsUpdate = true;
}
function setwrapT(value) {
circleTexture.wrapT = value;
circleTexture.needsUpdate = true;
}
}
};
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;