【发布时间】：2018-11-07 23:14:31
【问题描述】：
下面的代码应该生成一个立方体和一些点（属于一个圆环）。我只能看到立方体。我已经搜索了几个小时，但什么也没有。
// just a cube
cube = new THREE.Mesh(
new THREE.CubeGeometry(50, 50, 50),
new THREE.MeshNormalMaterial({ wireframe: true }));
// a mesh of the torus
function TorusMesh(R, r, nx, ny) {
var vertices = new Array(nx);
var normals = new Array(nx);
for (var i = 0; i < nx; i++) {
vertices[i] = new Array(ny);
normals[i] = new Array(ny);
var u = i / nx * 2 * Math.PI;
var cos_u = Math.cos(u);
var sin_u = Math.sin(u);
var cx = R * cos_u;
var cy = R * sin_u;
for (var j = 0; j < ny; j++) {
var v = j / ny * 2 * Math.PI;
var rcos_v = r * Math.cos(v);
var rsin_v = r * Math.sin(v);
vertices[i][j] = new THREE.Vector3(
cx + rcos_v * cos_u,
cy + rcos_v * sin_u,
rsin_v
);
normals[i][j] = new THREE.Vector3(
rcos_v * cos_u,
rcos_v * sin_u,
rsin_v
);
}
}
var faces = Array(4);
faces[0] = Array(2 * nx * ny);
faces[1] = Array(2 * nx * ny);
for (var i = 0; i < nx; i++) {
var ip1 = (i == nx - 1 ? 0 : i + 1);
for (var j = 0; j < ny; j++) {
var jp1 = (j == ny - 1 ? 0 : j + 1);
faces[0] = [
ip1 * ny + j,
i * ny + j,
i * ny + jp1,
[normals[ip1][j], normals[i][j], normals[i][jp1]]
];
faces[1] = [
ip1 * ny + j,
i * ny + jp1,
ip1 * ny + jp1,
[normals[ip1][j], normals[i][jp1], normals[ip1][jp1]]
];
var Pair = [faces[0], faces[1]];
}
}
return {
vertices: vertices,
normals: normals
//faces: TODO
}
}
// the vertices as a cloud of dots
var dotGeometry = new THREE.Geometry();
var vertices = TorusMesh(10, 3, 16, 8).vertices;
for (var j = 0; j < 8; j++) {
for (var i = 0; i < 15; i++) {
dotGeometry[j * 15 + i] = vertices[i][j]
}
}
var dotMaterial =
new THREE.PointsMaterial({
size: 5,
sizeAttenuation: false,
color: 0x000000
});
cloud = new THREE.Points(dotGeometry, dotMaterial);
console.log(cloud);
// three js scene
var aspect = window.innerWidth / window.innerHeight;
var camera = new THREE.PerspectiveCamera(150, aspect, 1, 10000);
var scene = new THREE.Scene();
camera.position.set(0, 0, 20);
scene.add(camera);
// dat.gui controls -------------------------------------------------
var dgcontrols = new function () {
this.rotationSpeed = 0.001;
this.zoom = 20;
}
var gui = new dat.GUI({ autoplace: false, width: 350 });
gui.add(dgcontrols, 'rotationSpeed').min(0).max(0.005).name("Rotation speed");
var controller_zoom = gui.add(dgcontrols, 'zoom').min(1).max(3000);
controller_zoom.onFinishChange(function (value) {
camera.position.z = value;
});
// the render() function
var renderer = new THREE.WebGLRenderer();
function render() {
renderer.render(scene, camera);
object.rotation.x += dgcontrols.rotationSpeed;
object.rotation.y += dgcontrols.rotationSpeed;
requestAnimFrame(render);
}
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
window.requestAnimFrame = (function () {
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
function (callback) {
window.setTimeout(callback, 1000 / 60);
};
})();
// add objects to the scene
var object = new THREE.Object3D();
scene.add(cloud);
scene.add(cube);
render()
requestAnimFrame(render);
canvas {
width: 100%;
height: 100%
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<script src="https://threejs.org/build/three.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.7.3/dat.gui.js"></script>【问题讨论】：
标签： javascript three.js