webgl_texture3d
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 { OrbitControls } from "three/examples/jsm/controls/OrbitControls.js";
import { NRRDLoader } from "three/examples/jsm/loaders/NRRDLoader.js";
import { VolumeRenderShader1 } from "three/examples/jsm/shaders/VolumeShader.js";
/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
name: "webgl_texture3d",
useLoaders: [NRRDLoader],
info: [
[
{
tag: "a",
link: "https://threejs.org",
content: "three.js"
},
{
tag: "text",
content: "- Float volume render test (mip / isosurface)"
}
]
],
init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
let renderer, scene, camera, controls, material, volconfig, cmtextures;
init();
function init() {
scene = new THREE.Scene();
renderer = new THREE.WebGLRenderer({ canvas });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
const h = 512;
const aspect = window.innerWidth / window.innerHeight;
camera = new THREE.OrthographicCamera(
-512 * aspect / 2,
h * aspect / 2,
h / 2,
-512 / 2,
1,
1e3
);
camera.position.set(-64, -64, 128);
camera.up.set(0, 0, 1);
controls = new OrbitControls(camera, renderer.domElement);
controls.addEventListener("change", render);
controls.target.set(64, 64, 128);
controls.minZoom = 0.5;
controls.maxZoom = 4;
controls.enablePan = false;
controls.update();
volconfig = {
clim1: 0,
clim2: 1,
renderstyle: "iso",
isothreshold: 0.15,
colormap: "viridis"
};
const gui = new GUI();
gui.add(volconfig, "clim1", 0, 1, 0.01).onChange(updateUniforms);
gui.add(volconfig, "clim2", 0, 1, 0.01).onChange(updateUniforms);
gui.add(volconfig, "colormap", { gray: "gray", viridis: "viridis" }).onChange(updateUniforms);
gui.add(volconfig, "renderstyle", { mip: "mip", iso: "iso" }).onChange(updateUniforms);
gui.add(volconfig, "isothreshold", 0, 1, 0.01).onChange(updateUniforms);
new NRRDLoader().load("models/nrrd/stent.nrrd", function(volume) {
const texture = new THREE.Data3DTexture(
volume.data,
volume.xLength,
volume.yLength,
volume.zLength
);
texture.format = THREE.RedFormat;
texture.type = THREE.FloatType;
texture.minFilter = texture.magFilter = THREE.LinearFilter;
texture.unpackAlignment = 1;
texture.needsUpdate = true;
cmtextures = {
viridis: new THREE.TextureLoader().load("textures/cm_viridis.png", render),
gray: new THREE.TextureLoader().load("textures/cm_gray.png", render)
};
const shader = VolumeRenderShader1;
const uniforms = THREE.UniformsUtils.clone(shader.uniforms);
uniforms["u_data"].value = texture;
uniforms["u_size"].value.set(volume.xLength, volume.yLength, volume.zLength);
uniforms["u_clim"].value.set(volconfig.clim1, volconfig.clim2);
uniforms["u_renderstyle"].value = volconfig.renderstyle == "mip" ? 0 : 1;
uniforms["u_renderthreshold"].value = volconfig.isothreshold;
uniforms["u_cmdata"].value = cmtextures[volconfig.colormap];
material = new THREE.ShaderMaterial({
uniforms,
vertexShader: shader.vertexShader,
fragmentShader: shader.fragmentShader,
side: THREE.BackSide
// The volume shader uses the backface as its "reference point"
});
const geometry = new THREE.BoxGeometry(volume.xLength, volume.yLength, volume.zLength);
geometry.translate(
volume.xLength / 2 - 0.5,
volume.yLength / 2 - 0.5,
volume.zLength / 2 - 0.5
);
const mesh = new THREE.Mesh(geometry, material);
scene.add(mesh);
render();
});
window.addEventListener("resize", onWindowResize);
needToDispose(renderer, scene, controls);
}
function updateUniforms() {
material.uniforms["u_clim"].value.set(volconfig.clim1, volconfig.clim2);
material.uniforms["u_renderstyle"].value = volconfig.renderstyle == "mip" ? 0 : 1;
material.uniforms["u_renderthreshold"].value = volconfig.isothreshold;
material.uniforms["u_cmdata"].value = cmtextures[volconfig.colormap];
render();
}
function onWindowResize() {
renderer.setSize(window.innerWidth, window.innerHeight);
const aspect = window.innerWidth / window.innerHeight;
const frustumHeight = camera.top - camera.bottom;
camera.left = -frustumHeight * aspect / 2;
camera.right = frustumHeight * aspect / 2;
camera.updateProjectionMatrix();
render();
}
function render() {
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;