如何使用three.js创建一个球体？

Question

如何使用three.js创建一个球体？

3

我正在使用three.js制作一个球体，但输出结果只是一个黑屏，如下图所示。

我使用的代码是：

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>My first three.js app</title>
        <style>
            body { margin: 0; }
        </style>
    </head>
    <body>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r79/three.min.js"></script>
        <script>
            const scene = new THREE.Scene();
            const camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 );

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

            const geometry = new THREE.SphereGeometry( 15, 32, 16 );
            const material = new THREE.MeshBasicMaterial( { color: 0xffff00 } );
            const sphere = new THREE.Mesh( geometry, material );
            scene.add( sphere );

            camera.position.z = 5;

            function animate() {
                requestAnimationFrame( animate );

                sphere.rotation.x += 0.01;
                sphere.rotation.y += 0.01;

                renderer.render( scene, camera );
            };

            animate();
        </script>
    </body>
</html>

我无法解释为什么代码无法呈现球体。出了什么问题？

- Cambria

1个回答

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- Mugen87 · Accepted Answer

您的摄像机位于球体内部。像以下实时示例中那样，将其稍微远离原点：

const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
camera.position.z = 50;

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

const geometry = new THREE.SphereGeometry(15, 32, 16);
const material = new THREE.MeshBasicMaterial({
  color: 0xffff00
});
const sphere = new THREE.Mesh(geometry, material);
scene.add(sphere);

function animate() {
  requestAnimationFrame(animate);

  sphere.rotation.x += 0.01;
  sphere.rotation.y += 0.01;

  renderer.render(scene, camera);
};

animate();

body {
      margin: 0;
}

<script src="https://cdn.jsdelivr.net/npm/three@0.143/build/three.min.js"></script>