click点击添加物体,shirft+click点击删除物体
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<title>three.js webgl - interactive - voxel painter</title>
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a {
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<div id="info">
<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - voxel painter - webgl<br>
<strong>click</strong>: add voxel, <strong>shift + click</strong>: remove voxel
</div>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.6.3/dist/es-module-shims.js"></script>
<script type="importmap">
{
"imports": {
"three": "../build/three.module.js",
"three/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
let camera, scene, renderer;
let plane;
let pointer, raycaster, isShiftDown = false;
let rollOverMesh, rollOverMaterial;
let cubeGeo, cubeMaterial;
// objects数组用来存放地平面和所有的小方块
const objects = [];
init();
render();
function init() {
camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 10000);
camera.position.set(500, 800, 1300);
camera.lookAt(0, 0, 0);
scene = new THREE.Scene();
scene.background = new THREE.Color(0xf0f0f0);
// roll-over helpers
const rollOverGeo = new THREE.BoxGeometry(50, 50, 50);
rollOverMaterial = new THREE.MeshBasicMaterial({ color: 0xff0000, opacity: 0.5, transparent: true });
rollOverMesh = new THREE.Mesh(rollOverGeo, rollOverMaterial);
scene.add(rollOverMesh);
// cubes
cubeGeo = new THREE.BoxGeometry(50, 50, 50);
cubeMaterial = new THREE.MeshLambertMaterial({ color: 0xfeb74c, map: new THREE.TextureLoader().load('textures/square-outline-textured.png') });
// grid
const gridHelper = new THREE.GridHelper(1000, 20);
scene.add(gridHelper);
//
raycaster = new THREE.Raycaster();
pointer = new THREE.Vector2();
const geometry = new THREE.PlaneGeometry(1000, 1000);
geometry.rotateX(- Math.PI / 2);
plane = new THREE.Mesh(geometry, new THREE.MeshBasicMaterial({ visible: false }));
scene.add(plane);
objects.push(plane);
// lights
const ambientLight = new THREE.AmbientLight(0x606060);
scene.add(ambientLight);
const directionalLight = new THREE.DirectionalLight(0xffffff);
directionalLight.position.set(1, 0.75, 0.5).normalize();
scene.add(directionalLight);
renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
document.addEventListener('pointermove', onPointerMove);
document.addEventListener('pointerdown', onPointerDown);
document.addEventListener('keydown', onDocumentKeyDown);
document.addEventListener('keyup', onDocumentKeyUp);
//
window.addEventListener('resize', onWindowResize);
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
render();
}
function onPointerMove(event) {
pointer.set((event.clientX / window.innerWidth) * 2 - 1, - (event.clientY / window.innerHeight) * 2 + 1);
raycaster.setFromCamera(pointer, camera);
const intersects = raycaster.intersectObjects(objects, false);
if (intersects.length > 0) {
// eslint-disable-next-line computed-property-spacing
const intersect = intersects[0];
rollOverMesh.position.copy(intersect.point).add(intersect.face.normal);
rollOverMesh.position.divideScalar(50).floor().multiplyScalar(50).addScalar(25);
render();
}
}
function onPointerDown(event) {
pointer.set((event.clientX / window.innerWidth) * 2 - 1, - (event.clientY / window.innerHeight) * 2 + 1);
raycaster.setFromCamera(pointer, camera);
const intersects = raycaster.intersectObjects(objects, false);
if (intersects.length > 0) {
const intersect = intersects[0];
// delete cube
if (isShiftDown) {
if (intersect.object !== plane) {
//除了从场景中删除小方块,还要从物体数组中删除小方块
scene.remove(intersect.object);
objects.splice(objects.indexOf(intersect.object), 1);
}
// create cube
} else {
const voxel = new THREE.Mesh(cubeGeo, cubeMaterial);
voxel.position.copy(intersect.point).add(intersect.face.normal);
voxel.position.divideScalar(50).floor().multiplyScalar(50).addScalar(25);
scene.add(voxel);
objects.push(voxel);
}
render();
}
}
function onDocumentKeyDown(event) {
switch (event.keyCode) {
case 16: isShiftDown = true; break;
}
}
function onDocumentKeyUp(event) {
switch (event.keyCode) {
case 16: isShiftDown = false; break;
}
}
function render() {
renderer.render(scene, camera);
}
</script>
</body>
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