You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
202 lines
5.6 KiB
202 lines
5.6 KiB
3 years ago
|
<!-- Licensed under a BSD license. See license.html for license -->
|
||
|
|
<!DOCTYPE html>
|
||
|
|
<html>
|
||
|
|
<head>
|
||
|
|
<meta charset="utf-8">
|
||
|
|
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
|
||
|
|
<title>Three.js - Picking - RayCaster</title>
|
||
|
|
<style>
|
||
|
|
html, body {
|
||
|
|
height: 100%;
|
||
|
|
margin: 0;
|
||
|
|
}
|
||
|
|
#c {
|
||
|
|
width: 100%;
|
||
|
|
height: 100%;
|
||
|
|
display: block;
|
||
|
|
}
|
||
|
|
</style>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<canvas id="c"></canvas>
|
||
|
|
</body>
|
||
|
|
<!-- Import maps polyfill -->
|
||
|
|
<!-- Remove this when import maps will be widely supported -->
|
||
|
|
<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
|
||
|
|
|
||
|
|
<script type="importmap">
|
||
|
|
{
|
||
|
|
"imports": {
|
||
|
|
"three": "../../build/three.module.js"
|
||
|
|
}
|
||
|
|
}
|
||
|
|
</script>
|
||
|
|
|
||
|
|
<script type="module">
|
||
|
|
import * as THREE from 'three';
|
||
|
|
|
||
|
|
function main() {
|
||
|
|
const canvas = document.querySelector('#c');
|
||
|
|
const renderer = new THREE.WebGLRenderer({canvas});
|
||
|
|
|
||
|
|
const fov = 60;
|
||
|
|
const aspect = 2; // the canvas default
|
||
|
|
const near = 0.1;
|
||
|
|
const far = 200;
|
||
|
|
const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
|
||
|
|
camera.position.z = 30;
|
||
|
|
|
||
|
|
const scene = new THREE.Scene();
|
||
|
|
scene.background = new THREE.Color('white');
|
||
|
|
|
||
|
|
// put the camera on a pole (parent it to an object)
|
||
|
|
// so we can spin the pole to move the camera around the scene
|
||
|
|
const cameraPole = new THREE.Object3D();
|
||
|
|
scene.add(cameraPole);
|
||
|
|
cameraPole.add(camera);
|
||
|
|
|
||
|
|
{
|
||
|
|
const color = 0xFFFFFF;
|
||
|
|
const intensity = 1;
|
||
|
|
const light = new THREE.DirectionalLight(color, intensity);
|
||
|
|
light.position.set(-1, 2, 4);
|
||
|
|
camera.add(light);
|
||
|
|
}
|
||
|
|
|
||
|
|
const boxWidth = 1;
|
||
|
|
const boxHeight = 1;
|
||
|
|
const boxDepth = 1;
|
||
|
|
const geometry = new THREE.BoxGeometry(boxWidth, boxHeight, boxDepth);
|
||
|
|
|
||
|
|
function rand(min, max) {
|
||
|
|
if (max === undefined) {
|
||
|
|
max = min;
|
||
|
|
min = 0;
|
||
|
|
}
|
||
|
|
return min + (max - min) * Math.random();
|
||
|
|
}
|
||
|
|
|
||
|
|
function randomColor() {
|
||
|
|
return `hsl(${rand(360) | 0}, ${rand(50, 100) | 0}%, 50%)`;
|
||
|
|
}
|
||
|
|
|
||
|
|
const numObjects = 100;
|
||
|
|
for (let i = 0; i < numObjects; ++i) {
|
||
|
|
const material = new THREE.MeshPhongMaterial({
|
||
|
|
color: randomColor(),
|
||
|
|
});
|
||
|
|
|
||
|
|
const cube = new THREE.Mesh(geometry, material);
|
||
|
|
scene.add(cube);
|
||
|
|
|
||
|
|
cube.position.set(rand(-20, 20), rand(-20, 20), rand(-20, 20));
|
||
|
|
cube.rotation.set(rand(Math.PI), rand(Math.PI), 0);
|
||
|
|
cube.scale.set(rand(3, 6), rand(3, 6), rand(3, 6));
|
||
|
|
}
|
||
|
|
|
||
|
|
function resizeRendererToDisplaySize(renderer) {
|
||
|
|
const canvas = renderer.domElement;
|
||
|
|
const width = canvas.clientWidth;
|
||
|
|
const height = canvas.clientHeight;
|
||
|
|
const needResize = canvas.width !== width || canvas.height !== height;
|
||
|
|
if (needResize) {
|
||
|
|
renderer.setSize(width, height, false);
|
||
|
|
}
|
||
|
|
return needResize;
|
||
|
|
}
|
||
|
|
|
||
|
|
class PickHelper {
|
||
|
|
constructor() {
|
||
|
|
this.raycaster = new THREE.Raycaster();
|
||
|
|
this.pickedObject = null;
|
||
|
|
this.pickedObjectSavedColor = 0;
|
||
|
|
}
|
||
|
|
pick(normalizedPosition, scene, camera, time) {
|
||
|
|
// restore the color if there is a picked object
|
||
|
|
if (this.pickedObject) {
|
||
|
|
this.pickedObject.material.emissive.setHex(this.pickedObjectSavedColor);
|
||
|
|
this.pickedObject = undefined;
|
||
|
|
}
|
||
|
|
|
||
|
|
// cast a ray through the frustum
|
||
|
|
this.raycaster.setFromCamera(normalizedPosition, camera);
|
||
|
|
// get the list of objects the ray intersected
|
||
|
|
const intersectedObjects = this.raycaster.intersectObjects(scene.children);
|
||
|
|
if (intersectedObjects.length) {
|
||
|
|
// pick the first object. It's the closest one
|
||
|
|
this.pickedObject = intersectedObjects[0].object;
|
||
|
|
// save its color
|
||
|
|
this.pickedObjectSavedColor = this.pickedObject.material.emissive.getHex();
|
||
|
|
// set its emissive color to flashing red/yellow
|
||
|
|
this.pickedObject.material.emissive.setHex((time * 8) % 2 > 1 ? 0xFFFF00 : 0xFF0000);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
const pickPosition = {x: 0, y: 0};
|
||
|
|
const pickHelper = new PickHelper();
|
||
|
|
clearPickPosition();
|
||
|
|
|
||
|
|
function render(time) {
|
||
|
|
time *= 0.001; // convert to seconds;
|
||
|
|
|
||
|
|
if (resizeRendererToDisplaySize(renderer)) {
|
||
|
|
const canvas = renderer.domElement;
|
||
|
|
camera.aspect = canvas.clientWidth / canvas.clientHeight;
|
||
|
|
camera.updateProjectionMatrix();
|
||
|
|
}
|
||
|
|
|
||
|
|
cameraPole.rotation.y = time * .1;
|
||
|
|
|
||
|
|
pickHelper.pick(pickPosition, scene, camera, time);
|
||
|
|
|
||
|
|
renderer.render(scene, camera);
|
||
|
|
|
||
|
|
requestAnimationFrame(render);
|
||
|
|
}
|
||
|
|
requestAnimationFrame(render);
|
||
|
|
|
||
|
|
function getCanvasRelativePosition(event) {
|
||
|
|
const rect = canvas.getBoundingClientRect();
|
||
|
|
return {
|
||
|
|
x: (event.clientX - rect.left) * canvas.width / rect.width,
|
||
|
|
y: (event.clientY - rect.top ) * canvas.height / rect.height,
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
function setPickPosition(event) {
|
||
|
|
const pos = getCanvasRelativePosition(event);
|
||
|
|
pickPosition.x = (pos.x / canvas.width ) * 2 - 1;
|
||
|
|
pickPosition.y = (pos.y / canvas.height) * -2 + 1; // note we flip Y
|
||
|
|
}
|
||
|
|
|
||
|
|
function clearPickPosition() {
|
||
|
|
// unlike the mouse which always has a position
|
||
|
|
// if the user stops touching the screen we want
|
||
|
|
// to stop picking. For now we just pick a value
|
||
|
|
// unlikely to pick something
|
||
|
|
pickPosition.x = -100000;
|
||
|
|
pickPosition.y = -100000;
|
||
|
|
}
|
||
|
|
window.addEventListener('mousemove', setPickPosition);
|
||
|
|
window.addEventListener('mouseout', clearPickPosition);
|
||
|
|
window.addEventListener('mouseleave', clearPickPosition);
|
||
|
|
|
||
|
|
window.addEventListener('touchstart', (event) => {
|
||
|
|
// prevent the window from scrolling
|
||
|
|
event.preventDefault();
|
||
|
|
setPickPosition(event.touches[0]);
|
||
|
|
}, {passive: false});
|
||
|
|
|
||
|
|
window.addEventListener('touchmove', (event) => {
|
||
|
|
setPickPosition(event.touches[0]);
|
||
|
|
});
|
||
|
|
|
||
|
|
window.addEventListener('touchend', clearPickPosition);
|
||
|
|
}
|
||
|
|
|
||
|
|
main();
|
||
|
|
</script>
|
||
|
|
</html>
|
||
|
|
|