Threejs里执行对象的多个动画

news2025/1/13 13:26:27

承接上文，本文讲述如何在Threejs里播放对象的多个动画，这也是研究了很久才解决的…

一导出模型

在Blender里按照File->Export，选择glTF2.0

然后在弹框的右上角选择导出为glTF Embedded (.gltf)

这样就把模型导出来了，该模型里包含了2个动画。

二 Threejs样例

Threejs的安装本文不会描述，可以参考官方文档，比较简单。

main.js内容如下，

import * as THREE from 'three';

import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader';
import { DRACOLoader } from 'three/examples/jsm/loaders/DRACOLoader';
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import { GUI } from 'lil-gui'



const scene = new THREE.Scene();
scene.background = new THREE.Color(0xffffff );
const camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1e-5, 1e10 );
camera.position.set(0, 15, 30);



var ambient = new THREE.AmbientLight(0xffffff);
scene.add(ambient);

const renderer = new THREE.WebGLRenderer({ antialias: true, logarithmicDepthBuffer: true });
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.setPixelRatio(window.devicePixelRatio);
renderer.outputColorSpace = THREE.SRGBColorSpace;

document.body.appendChild( renderer.domElement );

const loader = new GLTFLoader();

const dracoLoader = new DRACOLoader();
loader.setDRACOLoader(dracoLoader);


let modelReady = false;
let gltfscene;
let horsevisible = false;
let mixer;


let actions;


loader.load(
    '/models/33.gltf',
    function (gltf) {
        gltfscene = gltf.scene;
        scene.add(gltfscene);

        console.log(gltf.animations);

        mixer = new THREE.AnimationMixer(gltf.scene);

        let Action1 = mixer.clipAction( gltf.animations[0] );
        let Action2 = mixer.clipAction( gltf.animations[1] );

        actions = [Action1, Action2];

        modelReady = true;
    },
    function(xhr) {
        console.log((xhr.loaded / xhr.total * 100) + '% loaded');
    },
    function (error) {
        console.log('An error happened.');
    }
)


const obj = {
    myFunction: function () {
        if (horsevisible == false)
        {
            actions[0].clampWhenFinished = true;
            actions[0].setLoop(THREE.LoopOnce);
            actions[0].play();
            actions[1].stop(); // 非常关键
        }
        else
        {
            actions[1].clampWhenFinished = true;
            actions[1].setLoop(THREE.LoopOnce);
            actions[1].play();
            actions[0].stop(); // 非常关键
        }

        horsevisible = !horsevisible;
    }
}
const gui = new GUI()
gui.add(obj, 'myFunction'); // 按钮


const grid = new THREE.GridHelper( 2000, 20, 0x000000, 0x000000 );
grid.material.opacity = 0.3;
grid.material.transparent = true;
scene.add( grid );

const controls = new OrbitControls(camera, renderer.domElement);
controls.update();


const clock = new THREE.Clock();

function animate() {
    requestAnimationFrame( animate );
    if (modelReady)
    {
        mixer.update(clock.getDelta());
    }

    controls.update();

    renderer.render( scene, camera );
}

animate();