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bvh_batchedMesh.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>bvh_batchedMesh</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
</head>
<style>
body {
margin: 0;
overflow: hidden;
}
</style>
<body>
<script type="importmap">
{
"imports": {
"three": "https://cdnjs.cloudflare.com/ajax/libs/three.js/0.166.1/three.module.js",
"three/addons/": "./jsm/",
"three-mesh-bvh": "./bvh_core/src/index.js",
"bvh-gensdf" : "./bvh_gensdf/"
}
}
</script>
<script type="module">
import Stats from 'three/addons/stats.module.js';
import * as dat from 'three/addons/lil-gui.module.min.js';
import * as THREE from 'three';
import {
acceleratedRaycast, computeBoundsTree, disposeBoundsTree,
computeBatchedBoundsTree, disposeBatchedBoundsTree,
CENTER, SAH, AVERAGE,
} from 'three-mesh-bvh';
THREE.Mesh.prototype.raycast = acceleratedRaycast;
THREE.BufferGeometry.prototype.computeBoundsTree = computeBoundsTree;
THREE.BufferGeometry.prototype.disposeBoundsTree = disposeBoundsTree;
THREE.BatchedMesh.prototype.raycast = acceleratedRaycast;
THREE.BatchedMesh.prototype.computeBoundsTree = computeBatchedBoundsTree;
THREE.BatchedMesh.prototype.disposeBoundsTree = disposeBatchedBoundsTree;
const bgColor = 0xcfd8dc;
const meshColor = 0x263238;
const lineColor = 0xd81b60;
let renderer, scene, stats, camera;
let material, containerObj, batchedMesh;
const rayCasterObjects = [];
// Create ray casters in the scene
const raycaster = new THREE.Raycaster();
const sphere = new THREE.SphereGeometry( 0.25, 20, 20 );
const cylinder = new THREE.CylinderGeometry( 0.01, 0.01 );
const pointDist = 25;
const dolly = new THREE.Object3D();
// Delta timer
let lastFrameTime = null;
let deltaTime = 0;
const params = {
raycasters: {
count: 150,
speed: 1,
near: 0,
far: pointDist
},
mesh: {
splitStrategy: CENTER,
useBoundsTree: true,
speed: 1,
}
};
init();
updateFromOptions();
render();
function init() {
// renderer setup
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.setClearColor( bgColor, 1 );
document.body.appendChild( renderer.domElement );
// scene setup
scene = new THREE.Scene();
scene.fog = new THREE.Fog( bgColor, 40, 100 );
const light = new THREE.DirectionalLight( 0xffffff, 1.5 );
light.position.set( 1, 1, 1 );
scene.add( light );
scene.add( new THREE.AmbientLight( 0xffffff, 1.2 ) );
containerObj = new THREE.Object3D();
material = new THREE.MeshPhongMaterial( { color: meshColor } );
containerObj.scale.multiplyScalar( 10 );
containerObj.rotation.x = 10.989999999999943;
containerObj.rotation.y = 10.989999999999943;
scene.add( containerObj );
createBatchedMesh();
// camera setup
camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 50 );
camera.position.z = 40;
camera.far = 100;
camera.updateProjectionMatrix();
// stats setup
stats = new Stats();
document.body.appendChild( stats.dom );
// Run
const gui = new dat.GUI();
const rcFolder = gui.addFolder( 'Raycasters' );
rcFolder.add( params.raycasters, 'count' ).min( 1 ).max( 1000 ).step( 1 ).onChange( () => updateFromOptions() );
rcFolder.add( params.raycasters, 'speed' ).min( 0 ).max( 20 );
rcFolder.add( params.raycasters, 'near' ).min( 0 ).max( pointDist ).onChange( () => updateFromOptions() );
rcFolder.add( params.raycasters, 'far' ).min( 0 ).max( pointDist ).onChange( () => updateFromOptions() );
rcFolder.open();
const meshFolder = gui.addFolder( 'Mesh' );
meshFolder.add( params.mesh, 'useBoundsTree' ).onChange( () => updateFromOptions() );
meshFolder.add( params.mesh, 'splitStrategy', { 'CENTER': CENTER, 'SAH': SAH, 'AVERAGE': AVERAGE } ).onChange( () => updateFromOptions() );
meshFolder.add( params.mesh, 'speed' ).min( 0 ).max( 20 );
meshFolder.open();
window.addEventListener( 'resize', function () {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}, false );
}
function createBatchedMesh() {
const sphereGeometry = new THREE.BoxGeometry( .2, .2, .2);
let maxVertices = 0;
let maxIndexes = 0;
const gridSize = 6; // Lưới 3x3x3
const margin = .3 ; // Khoảng cách giữa các sphere
// Tính toán tổng số đỉnh và chỉ số
for (let i = 0; i < gridSize * gridSize * gridSize; i++) {
maxVertices += sphereGeometry.attributes.position.count;
maxIndexes += sphereGeometry.index.count;
}
// Tạo BatchedMesh
const batchedMesh = new THREE.BatchedMesh(gridSize * gridSize * gridSize, maxVertices, maxIndexes, material);
// Lặp qua từng sphere và sắp xếp chúng vào grid 3D với margin
let index = 0;
for (let x = 0; x < gridSize; x++) {
for (let y = 0; y < gridSize; y++) {
for (let z = 0; z < gridSize; z++) {
// Thêm hình học cho sphere
const sphereGeometryId = batchedMesh.addGeometry(sphereGeometry);
batchedMesh.addInstance(sphereGeometryId);
// Đặt vị trí của dolly cho từng sphere trong lưới 3D với khoảng cách giữa các sphere
dolly.position.set(
x * margin - (gridSize - 1) * margin / 2, // Điều chỉnh để tâm lưới nằm ở (0, 0, 0)
y * margin - (gridSize - 1) * margin / 2,
z * margin - (gridSize - 1) * margin / 2
);
dolly.updateMatrix();
// Đặt ma trận biến đổi cho sphere hiện tại
batchedMesh.setMatrixAt(index, dolly.matrix);
index++;
}
}
}
// Thêm batchedMesh vào container
containerObj.add(batchedMesh);
}
function addRaycaster() {
// Objects
const obj = new THREE.Object3D();
const material = new THREE.MeshBasicMaterial( { color: lineColor } );
const origMesh = new THREE.Mesh( sphere, material );
const hitMesh = new THREE.Mesh( sphere, material );
hitMesh.scale.multiplyScalar( 0.25 );
origMesh.scale.multiplyScalar( 0.5 );
const cylinderMesh = new THREE.Mesh( cylinder, new THREE.MeshBasicMaterial( { color: lineColor, transparent: true, opacity: 0.5 } ) );
// Init the rotation root
obj.add( cylinderMesh );
obj.add( origMesh );
obj.add( hitMesh );
scene.add( obj );
// set transforms
origMesh.position.set( pointDist, 0, 0 );
obj.rotation.x = Math.random() * 10;
obj.rotation.y = Math.random() * 10;
obj.rotation.z = Math.random() * 10;
// reusable vectors
const origVec = new THREE.Vector3();
const dirVec = new THREE.Vector3();
const xDir = ( Math.random() - 0.5 );
const yDir = ( Math.random() - 0.5 );
const zDir = ( Math.random() - 0.5 );
rayCasterObjects.push( {
update: () => {
obj.rotation.x += xDir * 0.0001 * params.raycasters.speed * deltaTime;
obj.rotation.y += yDir * 0.0001 * params.raycasters.speed * deltaTime;
obj.rotation.z += zDir * 0.0001 * params.raycasters.speed * deltaTime;
origMesh.updateMatrixWorld();
origVec.setFromMatrixPosition( origMesh.matrixWorld );
dirVec.copy( origVec ).multiplyScalar( - 1 ).normalize();
raycaster.set( origVec, dirVec );
raycaster.firstHitOnly = true;
const res = raycaster.intersectObject( containerObj, true );
const length = res.length ? res[ 0 ].distance : pointDist;
hitMesh.position.set( pointDist - length, 0, 0 );
const lineLength = res.length ? length - raycaster.near : length - raycaster.near - ( pointDist - raycaster.far );
cylinderMesh.position.set( pointDist - raycaster.near - ( lineLength / 2 ), 0, 0 );
cylinderMesh.scale.set( 1, lineLength, 1 );
cylinderMesh.rotation.z = Math.PI / 2;
},
remove: () => {
scene.remove( obj );
}
} );
}
function updateFromOptions() {
raycaster.near = params.raycasters.near;
raycaster.far = params.raycasters.far;
// Update raycaster count
while ( rayCasterObjects.length > params.raycasters.count ) {
rayCasterObjects.pop().remove();
}
while ( rayCasterObjects.length < params.raycasters.count ) {
addRaycaster();
}
if ( ! batchedMesh ) {
return;
}
// Update whether or not to use the bounds tree
if (
! params.mesh.useBoundsTree && batchedMesh.boundsTrees ||
batchedMesh.boundsTrees && params.mesh.splitStrategy !== batchedMesh.boundsTrees.splitStrategy
) {
batchedMesh.disposeBoundsTree();
batchedMesh.boundsTrees = null;
}
if ( params.mesh.useBoundsTree && ! batchedMesh.boundsTrees ) {
console.time( 'computing bounds tree' );
batchedMesh.computeBoundsTree( - 1, {
maxLeafTris: 5,
strategy: parseFloat( params.mesh.splitStrategy ),
} );
batchedMesh.boundsTrees.splitStrategy = params.mesh.splitStrategy;
console.timeEnd( 'computing bounds tree' );
}
}
function render() {
stats.begin();
const currTime = window.performance.now();
lastFrameTime = lastFrameTime || currTime;
deltaTime = currTime - lastFrameTime;
containerObj.rotation.x += 0.0001 * params.mesh.speed * deltaTime;
containerObj.rotation.y += 0.0001 * params.mesh.speed * deltaTime;
containerObj.updateMatrixWorld();
rayCasterObjects.forEach( f => f.update() );
renderer.render( scene, camera );
lastFrameTime = currTime;
stats.end();
requestAnimationFrame( render );
}
</script>
</body>
</html>