系列文章目录

1. React 使用 three.js 加载 gltf 3D模型 | three.js 入门
2. React + three.js 3D模型骨骼绑定
3. React + three.js 3D模型面部表情控制

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示例项目(github)：https://github.com/couchette/simple-react-three-facial-expression-demo
示例项目(gitcode)：https://gitcode.com/qq_41456316/simple-react-three-facial-expression-demo

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前言

在本系列的上一篇文章中，我们已经探讨了如何在 React 中利用 three.js 来渲染 3D 模型，现在，我们将深入研究如何运用 three.js 控制这些模型的表情。让我们一同探索如何赋予你的 3D 模型更加生动和丰富的表情吧！

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一、实现步骤

1、创建项目配置环境

使用 create-reacte-app 创建项目

npx create-react-app simple-react-three-facial-expression-demo
cd simple-react-three-facial-expression-demo

安装three.js

npm i three

2. 创建组件

在src目录创建components文件夹，在components文件夹下面创建ThreeContainer.js文件。
首先创建组件，并获取return 元素的ref

import * as THREE from "three";
import { useRef, useEffect } from "react";

function ThreeContainer() {
  const containerRef = useRef(null);
  const isContainerRunning = useRef(false);
  return <div ref={containerRef} />;
}

export default ThreeContainer;

接着将three.js自动创建渲染元素添加到return组件中为子元素(可见container.appendChild(renderer.domElement);)，相关逻辑代码在useEffect中执行，完整代码内容如下

import * as THREE from "three";

import WebGPU from "three/addons/capabilities/WebGPU.js";
import WebGL from "three/addons/capabilities/WebGL.js";

import WebGPURenderer from "three/addons/renderers/webgpu/WebGPURenderer.js";

import Stats from "three/addons/libs/stats.module.js";

import { OrbitControls } from "three/addons/controls/OrbitControls.js";

import { GLTFLoader } from "three/addons/loaders/GLTFLoader.js";
import { KTX2Loader } from "three/addons/loaders/KTX2Loader.js";
import { MeshoptDecoder } from "three/addons/libs/meshopt_decoder.module.js";

import { GUI } from "three/addons/libs/lil-gui.module.min.js";
import { useRef, useEffect } from "react";

function ThreeContainer() {
  const containerRef = useRef(null);
  const isContainerRunning = useRef(false);

  useEffect(() => {
    if (!isContainerRunning.current && containerRef.current) {
      isContainerRunning.current = true;
      init();
    }

    async function init() {
      if (
        WebGPU.isAvailable() === false &&
        WebGL.isWebGL2Available() === false
      ) {
        containerRef.current.appendChild(WebGPU.getErrorMessage());

        throw new Error("No WebGPU or WebGL2 support");
      }

      let mixer;

      const clock = new THREE.Clock();

      const container = containerRef.current;

      const camera = new THREE.PerspectiveCamera(
        45,
        window.innerWidth / window.innerHeight,
        1,
        20
      );
      camera.position.set(-1.8, 0.8, 3);

      const scene = new THREE.Scene();
      scene.add(new THREE.HemisphereLight(0xffffff, 0x443333, 2));

      const renderer = new WebGPURenderer({ antialias: true });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.toneMapping = THREE.ACESFilmicToneMapping;
      renderer.setAnimationLoop(animate);

      container.appendChild(renderer.domElement);

      const ktx2Loader = await new KTX2Loader()
        .setTranscoderPath("/basis/")
        .detectSupportAsync(renderer);

      new GLTFLoader()
        .setKTX2Loader(ktx2Loader)
        .setMeshoptDecoder(MeshoptDecoder)
        .load("models/facecap.glb", (gltf) => {
          const mesh = gltf.scene.children[0];

          scene.add(mesh);

          mixer = new THREE.AnimationMixer(mesh);

          mixer.clipAction(gltf.animations[0]).play();

          // GUI

          const head = mesh.getObjectByName("mesh_2");
          const influences = head.morphTargetInfluences;

          //head.morphTargetInfluences = null;

          // WebGPURenderer: Unsupported texture format. 33776
          head.material.map = null;

          const gui = new GUI();
          gui.close();

          for (const [key, value] of Object.entries(
            head.morphTargetDictionary
          )) {
            gui
              .add(influences, value, 0, 1, 0.01)
              .name(key.replace("blendShape1.", ""))
              .listen();
          }
        });

      scene.background = new THREE.Color(0x666666);

      const controls = new OrbitControls(camera, renderer.domElement);
      controls.enableDamping = true;
      controls.minDistance = 2.5;
      controls.maxDistance = 5;
      controls.minAzimuthAngle = -Math.PI / 2;
      controls.maxAzimuthAngle = Math.PI / 2;
      controls.maxPolarAngle = Math.PI / 1.8;
      controls.target.set(0, 0.15, -0.2);

      const stats = new Stats();
      container.appendChild(stats.dom);

      function animate() {
        const delta = clock.getDelta();

        if (mixer) {
          mixer.update(delta);
        }

        renderer.render(scene, camera);

        controls.update();

        stats.update();
      }

      window.addEventListener("resize", () => {
        camera.aspect = window.innerWidth / window.innerHeight;
        camera.updateProjectionMatrix();

        renderer.setSize(window.innerWidth, window.innerHeight);
      });
    }
  }, []);
  return <div ref={containerRef} />;
}

export default ThreeContainer;

3. 使用组件

修改App.js的内容如下

import "./App.css";
import ThreeContainer from "./components/ThreeContainer";

function App() {
  return (
    <div>
      <ThreeContainer />
    </div>
  );
}

export default App;

4. 运行项目

运行项目npm start最终效果如下

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总结

通过本文的介绍，相信读者对于在 React 中实现 3D 模型表情控制有了初步的了解。如果你对此感兴趣，不妨动手尝试一下，可能会有意想不到的收获。同时，也欢迎大家多多探索，将 React 和 Three.js 的强大功能发挥到极致，为网页应用增添更多的乐趣和惊喜。