//https://github.com/mrdoob/three.js/blob/master/examples/webgl_interactive_buffergeometry.html
AB.loadCSS ( '/uploads/threeport/main.css' );
// use JS to make HTML elements too:
AB.newDiv ( "container" );
// template is blank
// define your own Three.js World here
import * as THREE from '/api/threemodule/libs/three.module.js';
import Stats from '/uploads/threeport/stats.module.js';
let container, stats;
let camera, scene, renderer;
let raycaster, pointer;
let mesh, line;
init();
animate();
function init() {
container = document.getElementById( 'container' );
//
camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 1, 3500 );
camera.position.z = 2750;
scene = new THREE.Scene();
scene.background = new THREE.Color( 0x050505 );
scene.fog = new THREE.Fog( 0x050505, 2000, 3500 );
//
scene.add( new THREE.AmbientLight( 0x444444 ) );
const light1 = new THREE.DirectionalLight( 0xffffff, 0.5 );
light1.position.set( 1, 1, 1 );
scene.add( light1 );
const light2 = new THREE.DirectionalLight( 0xffffff, 1.5 );
light2.position.set( 0, - 1, 0 );
scene.add( light2 );
//
const triangles = 5000;
let geometry = new THREE.BufferGeometry();
const positions = new Float32Array( triangles * 3 * 3 );
const normals = new Float32Array( triangles * 3 * 3 );
const colors = new Float32Array( triangles * 3 * 3 );
const color = new THREE.Color();
const n = 800, n2 = n / 2; // triangles spread in the cube
const d = 120, d2 = d / 2; // individual triangle size
const pA = new THREE.Vector3();
const pB = new THREE.Vector3();
const pC = new THREE.Vector3();
const cb = new THREE.Vector3();
const ab = new THREE.Vector3();
for ( let i = 0; i < positions.length; i += 9 ) {
// positions
const x = Math.random() * n - n2;
const y = Math.random() * n - n2;
const z = Math.random() * n - n2;
const ax = x + Math.random() * d - d2;
const ay = y + Math.random() * d - d2;
const az = z + Math.random() * d - d2;
const bx = x + Math.random() * d - d2;
const by = y + Math.random() * d - d2;
const bz = z + Math.random() * d - d2;
const cx = x + Math.random() * d - d2;
const cy = y + Math.random() * d - d2;
const cz = z + Math.random() * d - d2;
positions[ i ] = ax;
positions[ i + 1 ] = ay;
positions[ i + 2 ] = az;
positions[ i + 3 ] = bx;
positions[ i + 4 ] = by;
positions[ i + 5 ] = bz;
positions[ i + 6 ] = cx;
positions[ i + 7 ] = cy;
positions[ i + 8 ] = cz;
// flat face normals
pA.set( ax, ay, az );
pB.set( bx, by, bz );
pC.set( cx, cy, cz );
cb.subVectors( pC, pB );
ab.subVectors( pA, pB );
cb.cross( ab );
cb.normalize();
const nx = cb.x;
const ny = cb.y;
const nz = cb.z;
normals[ i ] = nx;
normals[ i + 1 ] = ny;
normals[ i + 2 ] = nz;
normals[ i + 3 ] = nx;
normals[ i + 4 ] = ny;
normals[ i + 5 ] = nz;
normals[ i + 6 ] = nx;
normals[ i + 7 ] = ny;
normals[ i + 8 ] = nz;
// colors
const vx = ( x / n ) + 0.5;
const vy = ( y / n ) + 0.5;
const vz = ( z / n ) + 0.5;
color.setRGB( vx, vy, vz );
colors[ i ] = color.r;
colors[ i + 1 ] = color.g;
colors[ i + 2 ] = color.b;
colors[ i + 3 ] = color.r;
colors[ i + 4 ] = color.g;
colors[ i + 5 ] = color.b;
colors[ i + 6 ] = color.r;
colors[ i + 7 ] = color.g;
colors[ i + 8 ] = color.b;
}
geometry.setAttribute( 'position', new THREE.BufferAttribute( positions, 3 ) );
geometry.setAttribute( 'normal', new THREE.BufferAttribute( normals, 3 ) );
geometry.setAttribute( 'color', new THREE.BufferAttribute( colors, 3 ) );
geometry.computeBoundingSphere();
let material = new THREE.MeshPhongMaterial( {
color: 0xaaaaaa, specular: 0xffffff, shininess: 250,
side: THREE.DoubleSide, vertexColors: true
} );
mesh = new THREE.Mesh( geometry, material );
scene.add( mesh );
//
raycaster = new THREE.Raycaster();
pointer = new THREE.Vector2();
geometry = new THREE.BufferGeometry();
geometry.setAttribute( 'position', new THREE.BufferAttribute( new Float32Array( 4 * 3 ), 3 ) );
material = new THREE.LineBasicMaterial( { color: 0xffffff, transparent: true } );
line = new THREE.Line( geometry, material );
scene.add( line );
//
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
//
stats = new Stats();
container.appendChild( stats.dom );
//
window.addEventListener( 'resize', onWindowResize );
document.addEventListener( 'pointermove', onPointerMove );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function onPointerMove( event ) {
pointer.x = ( event.clientX / window.innerWidth ) * 2 - 1;
pointer.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
}
//
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
const time = Date.now() * 0.001;
mesh.rotation.x = time * 0.15;
mesh.rotation.y = time * 0.25;
raycaster.setFromCamera( pointer, camera );
const intersects = raycaster.intersectObject( mesh );
if ( intersects.length > 0 ) {
const intersect = intersects[ 0 ];
const face = intersect.face;
const linePosition = line.geometry.attributes.position;
const meshPosition = mesh.geometry.attributes.position;
linePosition.copyAt( 0, meshPosition, face.a );
linePosition.copyAt( 1, meshPosition, face.b );
linePosition.copyAt( 2, meshPosition, face.c );
linePosition.copyAt( 3, meshPosition, face.a );
mesh.updateMatrix();
line.geometry.applyMatrix4( mesh.matrix );
line.visible = true;
} else {
line.visible = false;
}
renderer.render( scene, camera );
}