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.
270 lines
6.7 KiB
270 lines
6.7 KiB
<!DOCTYPE html>
|
|
<html lang="en">
|
|
<head>
|
|
<title>three.js webgl - geometry - terrain</title>
|
|
<meta charset="utf-8">
|
|
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
|
|
<link type="text/css" rel="stylesheet" href="main.css">
|
|
<style>
|
|
body {
|
|
background-color: #bfd1e5;
|
|
color: #61443e;
|
|
}
|
|
a {
|
|
color: #a06851;
|
|
}
|
|
</style>
|
|
</head>
|
|
<body>
|
|
|
|
<div id="container"></div>
|
|
<div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - webgl terrain raycasting demo</div>
|
|
|
|
<!-- 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",
|
|
"three/addons/": "./jsm/"
|
|
}
|
|
}
|
|
</script>
|
|
|
|
<script type="module">
|
|
|
|
import * as THREE from 'three';
|
|
|
|
import Stats from 'three/addons/libs/stats.module.js';
|
|
|
|
import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
|
|
import { ImprovedNoise } from 'three/addons/math/ImprovedNoise.js';
|
|
|
|
let container, stats;
|
|
|
|
let camera, controls, scene, renderer;
|
|
|
|
let mesh, texture;
|
|
|
|
const worldWidth = 256, worldDepth = 256,
|
|
worldHalfWidth = worldWidth / 2, worldHalfDepth = worldDepth / 2;
|
|
|
|
let helper;
|
|
|
|
const raycaster = new THREE.Raycaster();
|
|
const pointer = new THREE.Vector2();
|
|
|
|
init();
|
|
animate();
|
|
|
|
function init() {
|
|
|
|
container = document.getElementById( 'container' );
|
|
container.innerHTML = '';
|
|
|
|
renderer = new THREE.WebGLRenderer( { antialias: true } );
|
|
renderer.setPixelRatio( window.devicePixelRatio );
|
|
renderer.setSize( window.innerWidth, window.innerHeight );
|
|
container.appendChild( renderer.domElement );
|
|
|
|
scene = new THREE.Scene();
|
|
scene.background = new THREE.Color( 0xbfd1e5 );
|
|
|
|
camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 10, 20000 );
|
|
|
|
controls = new OrbitControls( camera, renderer.domElement );
|
|
controls.minDistance = 1000;
|
|
controls.maxDistance = 10000;
|
|
controls.maxPolarAngle = Math.PI / 2;
|
|
|
|
//
|
|
|
|
const data = generateHeight( worldWidth, worldDepth );
|
|
|
|
controls.target.y = data[ worldHalfWidth + worldHalfDepth * worldWidth ] + 500;
|
|
camera.position.y = controls.target.y + 2000;
|
|
camera.position.x = 2000;
|
|
controls.update();
|
|
|
|
const geometry = new THREE.PlaneGeometry( 7500, 7500, worldWidth - 1, worldDepth - 1 );
|
|
geometry.rotateX( - Math.PI / 2 );
|
|
|
|
const vertices = geometry.attributes.position.array;
|
|
|
|
for ( let i = 0, j = 0, l = vertices.length; i < l; i ++, j += 3 ) {
|
|
|
|
vertices[ j + 1 ] = data[ i ] * 10;
|
|
|
|
}
|
|
|
|
//
|
|
|
|
texture = new THREE.CanvasTexture( generateTexture( data, worldWidth, worldDepth ) );
|
|
texture.wrapS = THREE.ClampToEdgeWrapping;
|
|
texture.wrapT = THREE.ClampToEdgeWrapping;
|
|
|
|
mesh = new THREE.Mesh( geometry, new THREE.MeshBasicMaterial( { map: texture } ) );
|
|
scene.add( mesh );
|
|
|
|
const geometryHelper = new THREE.ConeGeometry( 20, 100, 3 );
|
|
geometryHelper.translate( 0, 50, 0 );
|
|
geometryHelper.rotateX( Math.PI / 2 );
|
|
helper = new THREE.Mesh( geometryHelper, new THREE.MeshNormalMaterial() );
|
|
scene.add( helper );
|
|
|
|
container.addEventListener( 'pointermove', onPointerMove );
|
|
|
|
stats = new Stats();
|
|
container.appendChild( stats.dom );
|
|
|
|
//
|
|
|
|
window.addEventListener( 'resize', onWindowResize );
|
|
|
|
}
|
|
|
|
function onWindowResize() {
|
|
|
|
camera.aspect = window.innerWidth / window.innerHeight;
|
|
camera.updateProjectionMatrix();
|
|
|
|
renderer.setSize( window.innerWidth, window.innerHeight );
|
|
|
|
}
|
|
|
|
function generateHeight( width, height ) {
|
|
|
|
const size = width * height, data = new Uint8Array( size ),
|
|
perlin = new ImprovedNoise(), z = Math.random() * 100;
|
|
|
|
let quality = 1;
|
|
|
|
for ( let j = 0; j < 4; j ++ ) {
|
|
|
|
for ( let i = 0; i < size; i ++ ) {
|
|
|
|
const x = i % width, y = ~ ~ ( i / width );
|
|
data[ i ] += Math.abs( perlin.noise( x / quality, y / quality, z ) * quality * 1.75 );
|
|
|
|
}
|
|
|
|
quality *= 5;
|
|
|
|
}
|
|
|
|
return data;
|
|
|
|
}
|
|
|
|
function generateTexture( data, width, height ) {
|
|
|
|
// bake lighting into texture
|
|
|
|
let context, image, imageData, shade;
|
|
|
|
const vector3 = new THREE.Vector3( 0, 0, 0 );
|
|
|
|
const sun = new THREE.Vector3( 1, 1, 1 );
|
|
sun.normalize();
|
|
|
|
const canvas = document.createElement( 'canvas' );
|
|
canvas.width = width;
|
|
canvas.height = height;
|
|
|
|
context = canvas.getContext( '2d' );
|
|
context.fillStyle = '#000';
|
|
context.fillRect( 0, 0, width, height );
|
|
|
|
image = context.getImageData( 0, 0, canvas.width, canvas.height );
|
|
imageData = image.data;
|
|
|
|
for ( let i = 0, j = 0, l = imageData.length; i < l; i += 4, j ++ ) {
|
|
|
|
vector3.x = data[ j - 2 ] - data[ j + 2 ];
|
|
vector3.y = 2;
|
|
vector3.z = data[ j - width * 2 ] - data[ j + width * 2 ];
|
|
vector3.normalize();
|
|
|
|
shade = vector3.dot( sun );
|
|
|
|
imageData[ i ] = ( 96 + shade * 128 ) * ( 0.5 + data[ j ] * 0.007 );
|
|
imageData[ i + 1 ] = ( 32 + shade * 96 ) * ( 0.5 + data[ j ] * 0.007 );
|
|
imageData[ i + 2 ] = ( shade * 96 ) * ( 0.5 + data[ j ] * 0.007 );
|
|
|
|
}
|
|
|
|
context.putImageData( image, 0, 0 );
|
|
|
|
// Scaled 4x
|
|
|
|
const canvasScaled = document.createElement( 'canvas' );
|
|
canvasScaled.width = width * 4;
|
|
canvasScaled.height = height * 4;
|
|
|
|
context = canvasScaled.getContext( '2d' );
|
|
context.scale( 4, 4 );
|
|
context.drawImage( canvas, 0, 0 );
|
|
|
|
image = context.getImageData( 0, 0, canvasScaled.width, canvasScaled.height );
|
|
imageData = image.data;
|
|
|
|
for ( let i = 0, l = imageData.length; i < l; i += 4 ) {
|
|
|
|
const v = ~ ~ ( Math.random() * 5 );
|
|
|
|
imageData[ i ] += v;
|
|
imageData[ i + 1 ] += v;
|
|
imageData[ i + 2 ] += v;
|
|
|
|
}
|
|
|
|
context.putImageData( image, 0, 0 );
|
|
|
|
return canvasScaled;
|
|
|
|
}
|
|
|
|
//
|
|
|
|
function animate() {
|
|
|
|
requestAnimationFrame( animate );
|
|
|
|
render();
|
|
stats.update();
|
|
|
|
}
|
|
|
|
function render() {
|
|
|
|
renderer.render( scene, camera );
|
|
|
|
}
|
|
|
|
function onPointerMove( event ) {
|
|
|
|
pointer.x = ( event.clientX / renderer.domElement.clientWidth ) * 2 - 1;
|
|
pointer.y = - ( event.clientY / renderer.domElement.clientHeight ) * 2 + 1;
|
|
raycaster.setFromCamera( pointer, camera );
|
|
|
|
// See if the ray from the camera into the world hits one of our meshes
|
|
const intersects = raycaster.intersectObject( mesh );
|
|
|
|
// Toggle rotation bool for meshes that we clicked
|
|
if ( intersects.length > 0 ) {
|
|
|
|
helper.position.set( 0, 0, 0 );
|
|
helper.lookAt( intersects[ 0 ].face.normal );
|
|
|
|
helper.position.copy( intersects[ 0 ].point );
|
|
|
|
}
|
|
|
|
}
|
|
|
|
</script>
|
|
|
|
</body>
|
|
</html>
|
|
|