Можно использовать ThreeCSG / ThreeBSP для вычитания геометрии.
Создание ThreeBSP
объектов, образующих геометрию куба:
var geometry_Y = new THREE.BoxBufferGeometry( 1.5, 1.5, 0.99 );
var geometry_A = new THREE.BoxBufferGeometry( 0.7, 0.7, 0.7 );
geometry_A.translate( 0.5, 0.5, 0 );
var bsp_A = new ThreeBSP(geometry_A);
var bsp_Y = new ThreeBSP(geometry_Y);
Вычтите геометрию и создайте Mesh
:
var bsp_YsubA = bsp_Y.subtract(bsp_A);
var bsp_mesh = bsp_YsubA.toMesh();
bsp_mesh.material = new THREE.MeshLambertMaterial( { color: 0x00ff00 } );
scene.add( bsp_mesh );
См. Пример:
(function onLoad() {
var container, camera, scene, renderer, controls;
init();
animate();
function init() {
container = document.getElementById('container');
renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.shadowMap.enabled = true;
container.appendChild(renderer.domElement);
scene = new THREE.Scene();
scene.background = new THREE.Color(0xffffff);
camera = new THREE.PerspectiveCamera(70, window.innerWidth / window.innerHeight, 1, 10000);
camera.position.set(3, 1, -1);
scene.add(camera);
window.onresize = function() {
renderer.setSize(window.innerWidth, window.innerHeight);
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
}
var ambientLight = new THREE.AmbientLight(0x404040);
scene.add(ambientLight);
var directionalLight = new THREE.DirectionalLight( 0xffffff, 0.5 );
directionalLight.position.x = 4;
directionalLight.position.y = 1;
directionalLight.position.z = -2;
scene.add( directionalLight );
controls = new THREE.OrbitControls(camera, renderer.domElement);
addGridHelper();
createModel();
}
function createModel() {
var geometry_Y = new THREE.BoxBufferGeometry( 1.5, 1.5, 0.99 );
var geometry_A = new THREE.BoxBufferGeometry( 0.7, 0.7, 0.7 );
geometry_A.translate( 0.5, 0.5, 0 );
var bsp_A = new ThreeBSP(geometry_A);
var bsp_Y = new ThreeBSP(geometry_Y);
var bsp_YsubA = bsp_Y.subtract(bsp_A);
var bsp_mesh = bsp_YsubA.toMesh();
bsp_mesh.material = new THREE.MeshLambertMaterial( { color: 0x00ff00 } );
scene.add( bsp_mesh );
}
function addGridHelper() {
var helper = new THREE.GridHelper(10, 10);
helper.material.opacity = 0.25;
helper.material.transparent = true;
scene.add(helper);
var axis = new THREE.AxesHelper(100);
scene.add(axis);
}
function animate() {
requestAnimationFrame(animate);
render();
}
function render() {
renderer.render(scene, camera);
}
})();
<!--script src="https://threejs.org/build/three.js"></!--script-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/110/three.min.js"></script>
<script src="https://threejs.org/examples/js/controls/OrbitControls.js"></script>
<script src="https://rawgit.com/Wilt/ThreeCSG/develop/ThreeCSG.js"></script>
<div id="container"></div>
См. Также
Неожиданный результат при использовании ThreeCSG
После использования метода threeBSP созданный сферы не являются гладкими