從3個給定點定位3d平面

Question

給定3個動態點，定向平面使其與所有3個點相交的最佳方法是什麼？

我使用three.js所

Answer 1

要獲得矢量的方向進行定向的平面，計算的任何叉積三角形的兩面

所以，如果你的點是A，b，C

side1 = subVectors (a, b); 
side2 = subVectors (a, c); 
planeNormal = crossVectors (side1, side2); 

Answer 2

創建幾何。爲每個點添加一個頂點，並創建一個面。例如：你改變幾何

var geometry = new THREE.Geometry(); 
geometry.vertices.push(new THREE.Vector3(0,0,0)); 
geometry.vertices.push(new THREE.Vector3(1,1,0)); 
geometry.vertices.push(new THREE.Vector3(1,-1,0)); 
geometry.faces.push(new THREE.Face3(0, 1, 2)); 
geometry.dynamic = true; 
var shapeMesh = new THREE.Mesh(geometry, material); 
scene.add(shapeMesh); 

每次，一定要讓three.js所知道：

geometry.verticesNeedUpdate = true; 
geometry.elementsNeedUpdate = true;