当我尝试将样条线挤出到场景的原点时，我感到头疼。这就是我想做的：
我正在创建一个样条线
let centerX = 0
let centerY = 0
let radius = 200
let coils = 50
let rotation = 2 * Math.PI
let thetaMax = coils * Math.PI
let awayStep = radius / thetaMax
let chord = 5
let vertices = []
for (let theta = chord / awayStep; theta <= thetaMax;) {
let away = awayStep * theta
let around = theta + rotation
let x = centerX + Math.cos(around) * away
let y = centerY + Math.sin(around) * away
theta += chord / away
let vec3 = new THREE.Vector3(x, y, 0)
vertices.push(vec3)
}
let axisPoints = []
data.forEach((d, i) => {
axisPoints.push(new THREE.Vector3(vertices[i].z, vertices[i].y / 2, vertices[i].x / 2))
})
let axis = new THREE.CatmullRomCurve3(axisPoints)
let geometry = new THREE.BufferGeometry().setFromPoints(axis.getPoints(axisPoints.length))
let material = new THREE.LineBasicMaterial({
color: 0x481e34,
transparent: true,
opacity: 0.2
})
let splineObject = new THREE.Line(geometry, material)
scene.add(splineObject)
And I want to extrude a "mesh"/"face" along this spline which is going right to the scene's origin (0) exactly like this :
我已经尝试了很多东西，但我无法弄清楚:( 任何帮助将不胜感激！
Thanks!
作为一个选项，您可以使用样条线的坐标修改开放式圆柱缓冲区几何图形的坐标数组：
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 1, 1000);
camera.position.set(0, 5, 10);
var renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
var controls = new THREE.OrbitControls(camera, renderer.domElement);
scene.add(new THREE.GridHelper(10, 10, "white"));
var divisions = 100;
var points = [
new THREE.Vector3(-5, 5, 0),
new THREE.Vector3(-2, 2, 3),
new THREE.Vector3(1, 3, 2),
new THREE.Vector3(3, 5, -3),
new THREE.Vector3(-3, 4, -2)
];
var curve = new THREE.CatmullRomCurve3(points);
curve.closed = true;
var upperPoints = curve.getPoints(divisions);
var lowerPoints = upperPoints.map(p => {
return new THREE.Vector3(p.x, 0, p.z)
});
var upperGeom = new THREE.BufferGeometry().setFromPoints(upperPoints);
var lowerGeom = new THREE.BufferGeometry().setFromPoints(lowerPoints);
var cylGeom = new THREE.CylinderBufferGeometry(1, 1, 1, divisions, 1, true); // create an open-ended cylinder
cylGeom.attributes.position.array.set(upperGeom.attributes.position.array, 0); // set coordinates for upper points
cylGeom.attributes.position.array.set(lowerGeom.attributes.position.array, (divisions + 1) * 3); // set coordinates of lower points
cylGeom.computeVertexNormals();
var result = new THREE.Mesh(cylGeom, new THREE.MeshBasicMaterial({
color: 0xaaaaaa,
wireframe: true
}));
scene.add(result);
var upperLine = new THREE.Line(upperGeom, new THREE.LineBasicMaterial({
color: "aqua"
}));
scene.add(upperLine);
var lowerLine = new THREE.Line(lowerGeom, new THREE.LineBasicMaterial({
color: "yellow"
}));
scene.add(lowerLine);
renderer.setAnimationLoop(() => {
renderer.render(scene, camera);
});body {
overflow: hidden;
margin: 0;
}<script src="https://threejs.org/build/three.min.js"></script>
<script src="https://threejs.org/examples/js/controls/OrbitControls.js"></script>根据您的需要，您可以修改任何图元的点。