Three.js - PlaneGeometry from Math.Plane

Three.js - PlaneGeometry from Math.Plane

本文关键字：Math Plane from PlaneGeometry js Three      更新时间：2023-09-26

我试图通过Three.js中的一组点绘制一个最小二乘平面。我有一个定义如下的平面：

var plane = new THREE.Plane();
plane.setFromNormalAndCoplanarPoint(normal, point).normalize();

我的理解是，我需要使用该平面来创建一个几何体，以便创建一个网格添加到场景中进行显示：

var dispPlane = new THREE.Mesh(planeGeometry, planeMaterial);
scene.add(dispPlane);

我一直在尝试应用这个答案来获得几何图形。这就是我想到的：

plane.setFromNormalAndCoplanarPoint(dir, centroid).normalize();
planeGeometry.vertices.push(plane.normal);
planeGeometry.vertices.push(plane.orthoPoint(plane.normal));
planeGeometry.vertices.push(plane.orthoPoint(planeGeometry.vertices[1]));
planeGeometry.faces.push(new THREE.Face3(0, 1, 2));
planeGeometry.computeFaceNormals();
planeGeometry.computeVertexNormals();

但飞机根本没有显示，也没有错误表明我可能出了什么问题。

所以我的问题是，我怎样才能把Math.Plane对象用作网格的几何体呢？

这种方法应该创建平面的网格可视化。然而，我不确定这对最小二乘拟合有多适用。

 // Create plane
var dir = new THREE.Vector3(0,1,0);
var centroid = new THREE.Vector3(0,200,0);
var plane = new THREE.Plane();
plane.setFromNormalAndCoplanarPoint(dir, centroid).normalize();
// Create a basic rectangle geometry
var planeGeometry = new THREE.PlaneGeometry(100, 100);
// Align the geometry to the plane
var coplanarPoint = plane.coplanarPoint();
var focalPoint = new THREE.Vector3().copy(coplanarPoint).add(plane.normal);
planeGeometry.lookAt(focalPoint);
planeGeometry.translate(coplanarPoint.x, coplanarPoint.y, coplanarPoint.z);
// Create mesh with the geometry
var planeMaterial = new THREE.MeshLambertMaterial({color: 0xffff00, side: THREE.DoubleSide});
var dispPlane = new THREE.Mesh(planeGeometry, planeMaterial);
scene.add(dispPlane);

var material = ...;
var plane = new THREE.Plane(...);
// Align to plane
var geometry = new THREE.PlaneGeometry(100, 100);
var mesh = new THREE.Mesh(geometry, material);
mesh.translate(plane.coplanarPoint());
mesh.quaternion.setFromUnitVectors(new THREE.Vector3(0,0,1), plane.normal);

请注意，Plane.coplanarPoint()只是返回-normal*constant，因此使用Plane.projectPoint()来确定"接近"任意点的中心可能是更好的选择。

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