用threejs创建一个立方体，用ECHART绘制一个仪表盘，并贴在立方体表面上

好的，下面是用three.js创建一个立方体并用ECharts绘制一个仪表盘的基本步骤：

1. 引入three.js和ECharts的库文件。

<script src="https://cdn.staticfile.org/three.js/r128/three.min.js"></script>
<script src="https://cdn.staticfile.org/echarts/5.1.2/echarts.min.js"></script>

2. 创建一个three.js场景和相机。

var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth/window.innerHeight, 0.1, 1000 );
camera.position.z = 5;

3. 创建一个立方体，并将其添加到场景中。

var geometry = new THREE.BoxGeometry( 2, 2, 2 );
var material = new THREE.MeshBasicMaterial( {color: 0xffffff} );
var cube = new THREE.Mesh( geometry, material );
scene.add( cube );

4. 创建一个ECharts图表，并将其渲染到一个Canvas元素上。

var option = {
    // ECharts图表的配置参数
};
var chart = echarts.init(document.createElement('canvas'));
chart.setOption(option);

5. 将Canvas元素转换成three.js的纹理，并将其应用到立方体的表面上。

var texture = new THREE.CanvasTexture(chart.getDom());
var material = new THREE.MeshBasicMaterial({ map: texture });
cube.material = material;

6. 渲染场景。

function animate() {
    requestAnimationFrame( animate );
    cube.rotation.x += 0.01;
    cube.rotation.y += 0.01;
    renderer.render( scene, camera );
}
animate();

完整代码如下：

var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth/window.innerHeight, 0.1, 1000 );
camera.position.z = 5;

var geometry = new THREE.BoxGeometry( 2, 2, 2 );
var material = new THREE.MeshBasicMaterial( {color: 0xffffff} );
var cube = new THREE.Mesh( geometry, material );
scene.add( cube );

var option = {
    // ECharts图表的配置参数
};
var chart = echarts.init(document.createElement('canvas'));
chart.setOption(option);

var texture = new THREE.CanvasTexture(chart.getDom());
var material = new THREE.MeshBasicMaterial({ map: texture });
cube.material = material;

var renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );

function animate() {
    requestAnimationFrame( animate );
    cube.rotation.x += 0.01;
    cube.rotation.y += 0.01;
    renderer.render( scene, camera );
}
animate();

希望这个例子对您有所帮助！如果您有任何其他问题，请随时问我。