在Three.js中绕任意轴旋转对象，就像绕着地球的月亮一样。

Question

我已经尝试过很多解决问题的方法，但是对象
仍然绕着自己的轴线旋转，没有任何平移。

Answer 1

您可能想将对象添加为另一个对象的子对象，然后旋转该对象...

var renderer = new THREE.WebGLRenderer();
var w = 300;
var h = 200;
renderer.setSize( w,h );
document.body.appendChild( renderer.domElement );

var scene = new THREE.Scene();
  	var camera = new THREE.PerspectiveCamera(
	45,		// Field of view
	w/h,	// Aspect ratio
	0.1,		// Near
	10000		// Far
);
camera.position.set( 15, 10, 15 );
camera.lookAt( scene.position );
controls = new THREE.OrbitControls(camera, renderer.domElement);

var light = new THREE.PointLight( 0x808080 );
light.position.set( 20, 20, 20 );
scene.add( light );
var light1 = new THREE.AmbientLight( 0x101010 );
light1.position.set( 20, 20, 20 );
scene.add( light1 );
var light2 = new THREE.PointLight( 0x808080 );
light2.position.set( -20, 20, -20 );
scene.add( light2 );
var light3 = new THREE.PointLight( 0x808080 );
light3.position.set( -20, -20, -20 );
scene.add( light3 );
var mkBody=(rad,color)=>{   
var sphereGeom = new THREE.SphereGeometry(rad,16,16);
var material = new THREE.MeshLambertMaterial( { color: color } );
var mesh = new THREE.Mesh( sphereGeom, material );
return mesh;
}
var sun = mkBody(2,0xffee00)
scene.add( sun )
sun.material.emissive.set(0x808000)
var b1 = mkBody(0.7,0x80ffff)
b1.position.set(6,0,0)
sun.add( b1 )
var b2 = mkBody(0.2,0xeeeeee)
b2.position.set(1.1,0,0)
b1.add( b2 )
sun.onBeforeRender = function(){
    this.rotation.y+=0.01
}
b1.onBeforeRender = function(){
    this.rotation.y+=0.1
}
renderer.setClearColor( 0x404040, 1);

(function animate() {
    requestAnimationFrame(animate);
    controls.update();
    renderer.render(scene, camera);
})();

<script src="https://threejs.org/build/three.min.js"></script>
<script src="https://cdn.rawgit.com/mrdoob/three.js/master/examples/js/controls/OrbitControls.js"></script>

另一种选择是变换几何本身...

var renderer = new THREE.WebGLRenderer();
var w = 300;
var h = 200;
renderer.setSize( w,h );
document.body.appendChild( renderer.domElement );

var scene = new THREE.Scene();
  	var camera = new THREE.PerspectiveCamera(
	45,		// Field of view
	w/h,	// Aspect ratio
	0.1,		// Near
	10000		// Far
);
camera.position.set( 15, 10, 15 );
camera.lookAt( scene.position );
controls = new THREE.OrbitControls(camera, renderer.domElement);

var light = new THREE.PointLight( 0x808080 );
light.position.set( 20, 20, 20 );
scene.add( light );
var light1 = new THREE.AmbientLight( 0x101010 );
light1.position.set( 20, 20, 20 );
scene.add( light1 );
var light2 = new THREE.PointLight( 0x808080 );
light2.position.set( -20, 20, -20 );
scene.add( light2 );
var light3 = new THREE.PointLight( 0x808080 );
light3.position.set( -20, -20, -20 );
scene.add( light3 );
var mkBody=(rad,color)=>{   
    var sphereGeom = new THREE.SphereGeometry(rad,16,16);
    var material = new THREE.MeshLambertMaterial( { color: color } );
    var mesh = new THREE.Mesh( sphereGeom, material );
    return mesh;
}
var sun = mkBody(2,0xffee00)
scene.add( sun )
sun.material.emissive.set(0x808000)
var b1 = mkBody(0.7,0x80ffff)
b1.position.set(6,0,0)
sun.add( b1 )
b1.updateMatrixWorld();
b1.geometry.applyMatrix(b1.matrixWorld); //Transform the actual geometry...
scene.add(b1); //Now reparent it to the scene
b1.position.set(0,0,0); //And reset its position...

sun.onBeforeRender = function(){
    this.rotation.y+=0.01
}
b1.onBeforeRender = function(){
    this.rotation.y+=0.1
}
renderer.setClearColor( 0x404040, 1);

(function animate() {
    requestAnimationFrame(animate);
    controls.update();
    renderer.render(scene, camera);
})();

<script src="https://threejs.org/build/three.min.js"></script>
<script src="https://cdn.rawgit.com/mrdoob/three.js/master/examples/js/controls/OrbitControls.js"></script>