我必须生成大量可以单独拖动的对象。此外，这些物体仅限于平面形状（例如矩形或圆形）。 起初，我使用简单的 CircleGeometries，将其放置在另一个几何图形（平面）内。拖动它们也很容易，但正如预期的那样，大约 200000 个它们的性能非常差。 然后我决定使用点/粒子系统。平面内的定位工作得很好，但我无法设法使粒子系统的各个点可拖动。我在 Threejs 文档中找到了交互式粒子示例，但仍然不知道如何将它们与拖动控件结合起来。 这是我用于创建粒子系统并用这些点填充平面的代码：
//Create a plane geometrie, that is later filled with points
var geometry2 = new THREE.CircleGeometry(30,32);
var material2 = new THREE.MeshBasicMaterial( {color: 0x666666, side: THREE.DoubleSide, wireframe:true} );
var mat1 = new THREE.MeshBasicMaterial( {color: 0x00ff00, wireframe:false} );
var plane1 = new THREE.Mesh(geometry2, material2);
geometries.push(plane1); //push to object for draggable elements
scene.add(plane1);
var positionsX;
positionsX = inGeometry.inGeometry(plane1.geometry, 200000); // get positions for points inside plane1
var geometry = new THREE.Geometry();
for (var i = 0; i < positionsX.length; i++) {
geometry.vertices.push(positionsX[i]); //add positions to vertices
}
console.log(geometry);
//Create Particle system
var material = new THREE.PointsMaterial({ size:0.02, color: 0xffffff });
particleSystem = new THREE.Points(geometry, material);
scene.add(particleSystem);
console.log(particleSystem);
var dragGeo = new DragControls(geometries, camera, container); //dragging
有人可以帮忙吗？ 谢谢
只是一个如何拖动点的粗略示例：
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 1, 1000);
camera.position.set(1.25, 7, 7);
camera.lookAt(scene.position);
var renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
var geometry = new THREE.PlaneBufferGeometry(10, 10, 10, 10);
geometry.rotateX(-Math.PI * 0.5);
var plane = new THREE.Mesh(geometry, new THREE.MeshBasicMaterial({
wireframe: true,
color: "red"
}));
scene.add(plane);
var points = new THREE.Points(geometry, new THREE.PointsMaterial({
size: 0.25,
color: "yellow"
}));
scene.add(points);
var raycaster = new THREE.Raycaster();
raycaster.params.Points.threshold = 0.25;
var mouse = new THREE.Vector2();
var intersects = null;
var plane = new THREE.Plane();
var planeNormal = new THREE.Vector3();
var currentIndex = null;
var planePoint = new THREE.Vector3();
var dragging = false;
window.addEventListener("mousedown", mouseDown, false);
window.addEventListener("mousemove", mouseMove, false);
window.addEventListener("mouseup", mouseUp, false);
function mouseDown(event) {
setRaycaster(event);
getIndex();
dragging = true;
}
function mouseMove(event) {
if (dragging && currentIndex !== null) {
setRaycaster(event);
raycaster.ray.intersectPlane(plane, planePoint);
geometry.attributes.position.setXYZ(currentIndex, planePoint.x, planePoint.y, planePoint.z);
geometry.attributes.position.needsUpdate = true;
}
}
function mouseUp(event) {
dragging = false;
currentIndex = null;
}
function getIndex() {
intersects = raycaster.intersectObject(points);
if (intersects.length === 0) {
currentIndex = null;
return;
}
currentIndex = intersects[0].index;
setPlane(intersects[0].point);
}
function setPlane(point) {
planeNormal.subVectors(camera.position, point).normalize();
plane.setFromNormalAndCoplanarPoint(planeNormal, point);
}
function setRaycaster(event) {
getMouse(event);
raycaster.setFromCamera(mouse, camera);
}
function getMouse(event) {
mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
}
render();
function render() {
requestAnimationFrame(render);
renderer.render(scene, camera);
}body {
overflow: hidden;
margin: 0;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/91/three.min.js"></script>