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- <!-- 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 - Voxel Geometry - Textures</title>
- <style>
- html, body {
- height: 100%;
- margin: 0;
- }
- #c {
- width: 100%;
- height: 100%;
- display: block;
- }
- </style>
- </head>
- <body>
- <canvas id="c"></canvas>
- </body>
- <script type="importmap">
- {
- "imports": {
- "three": "../../build/three.module.js",
- "three/addons/": "../../examples/jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
- class VoxelWorld {
- constructor( options ) {
- this.cellSize = options.cellSize;
- this.tileSize = options.tileSize;
- this.tileTextureWidth = options.tileTextureWidth;
- this.tileTextureHeight = options.tileTextureHeight;
- const { cellSize } = this;
- this.cellSliceSize = cellSize * cellSize;
- this.cell = new Uint8Array( cellSize * cellSize * cellSize );
- }
- computeVoxelOffset( x, y, z ) {
- const { cellSize, cellSliceSize } = this;
- const voxelX = THREE.MathUtils.euclideanModulo( x, cellSize ) | 0;
- const voxelY = THREE.MathUtils.euclideanModulo( y, cellSize ) | 0;
- const voxelZ = THREE.MathUtils.euclideanModulo( z, cellSize ) | 0;
- return voxelY * cellSliceSize +
- voxelZ * cellSize +
- voxelX;
- }
- getCellForVoxel( x, y, z ) {
- const { cellSize } = this;
- const cellX = Math.floor( x / cellSize );
- const cellY = Math.floor( y / cellSize );
- const cellZ = Math.floor( z / cellSize );
- if ( cellX !== 0 || cellY !== 0 || cellZ !== 0 ) {
- return null;
- }
- return this.cell;
- }
- setVoxel( x, y, z, v ) {
- const cell = this.getCellForVoxel( x, y, z );
- if ( ! cell ) {
- return; // TODO: add a new cell?
- }
- const voxelOffset = this.computeVoxelOffset( x, y, z );
- cell[ voxelOffset ] = v;
- }
- getVoxel( x, y, z ) {
- const cell = this.getCellForVoxel( x, y, z );
- if ( ! cell ) {
- return 0;
- }
- const voxelOffset = this.computeVoxelOffset( x, y, z );
- return cell[ voxelOffset ];
- }
- generateGeometryDataForCell( cellX, cellY, cellZ ) {
- const { cellSize, tileSize, tileTextureWidth, tileTextureHeight } = this;
- const positions = [];
- const normals = [];
- const uvs = [];
- const indices = [];
- const startX = cellX * cellSize;
- const startY = cellY * cellSize;
- const startZ = cellZ * cellSize;
- for ( let y = 0; y < cellSize; ++ y ) {
- const voxelY = startY + y;
- for ( let z = 0; z < cellSize; ++ z ) {
- const voxelZ = startZ + z;
- for ( let x = 0; x < cellSize; ++ x ) {
- const voxelX = startX + x;
- const voxel = this.getVoxel( voxelX, voxelY, voxelZ );
- if ( voxel ) {
- // voxel 0 is sky (empty) so for UVs we start at 0
- const uvVoxel = voxel - 1;
- // There is a voxel here but do we need faces for it?
- for ( const { dir, corners, uvRow } of VoxelWorld.faces ) {
- const neighbor = this.getVoxel(
- voxelX + dir[ 0 ],
- voxelY + dir[ 1 ],
- voxelZ + dir[ 2 ] );
- if ( ! neighbor ) {
- // this voxel has no neighbor in this direction so we need a face.
- const ndx = positions.length / 3;
- for ( const { pos, uv } of corners ) {
- positions.push( pos[ 0 ] + x, pos[ 1 ] + y, pos[ 2 ] + z );
- normals.push( ...dir );
- uvs.push(
- ( uvVoxel + uv[ 0 ] ) * tileSize / tileTextureWidth,
- 1 - ( uvRow + 1 - uv[ 1 ] ) * tileSize / tileTextureHeight );
- }
- indices.push(
- ndx, ndx + 1, ndx + 2,
- ndx + 2, ndx + 1, ndx + 3,
- );
- }
- }
- }
- }
- }
- }
- return {
- positions,
- normals,
- uvs,
- indices,
- };
- }
- }
- VoxelWorld.faces = [
- { // left
- uvRow: 0,
- dir: [ - 1, 0, 0, ],
- corners: [
- { pos: [ 0, 1, 0 ], uv: [ 0, 1 ], },
- { pos: [ 0, 0, 0 ], uv: [ 0, 0 ], },
- { pos: [ 0, 1, 1 ], uv: [ 1, 1 ], },
- { pos: [ 0, 0, 1 ], uv: [ 1, 0 ], },
- ],
- },
- { // right
- uvRow: 0,
- dir: [ 1, 0, 0, ],
- corners: [
- { pos: [ 1, 1, 1 ], uv: [ 0, 1 ], },
- { pos: [ 1, 0, 1 ], uv: [ 0, 0 ], },
- { pos: [ 1, 1, 0 ], uv: [ 1, 1 ], },
- { pos: [ 1, 0, 0 ], uv: [ 1, 0 ], },
- ],
- },
- { // bottom
- uvRow: 1,
- dir: [ 0, - 1, 0, ],
- corners: [
- { pos: [ 1, 0, 1 ], uv: [ 1, 0 ], },
- { pos: [ 0, 0, 1 ], uv: [ 0, 0 ], },
- { pos: [ 1, 0, 0 ], uv: [ 1, 1 ], },
- { pos: [ 0, 0, 0 ], uv: [ 0, 1 ], },
- ],
- },
- { // top
- uvRow: 2,
- dir: [ 0, 1, 0, ],
- corners: [
- { pos: [ 0, 1, 1 ], uv: [ 1, 1 ], },
- { pos: [ 1, 1, 1 ], uv: [ 0, 1 ], },
- { pos: [ 0, 1, 0 ], uv: [ 1, 0 ], },
- { pos: [ 1, 1, 0 ], uv: [ 0, 0 ], },
- ],
- },
- { // back
- uvRow: 0,
- dir: [ 0, 0, - 1, ],
- corners: [
- { pos: [ 1, 0, 0 ], uv: [ 0, 0 ], },
- { pos: [ 0, 0, 0 ], uv: [ 1, 0 ], },
- { pos: [ 1, 1, 0 ], uv: [ 0, 1 ], },
- { pos: [ 0, 1, 0 ], uv: [ 1, 1 ], },
- ],
- },
- { // front
- uvRow: 0,
- dir: [ 0, 0, 1, ],
- corners: [
- { pos: [ 0, 0, 1 ], uv: [ 0, 0 ], },
- { pos: [ 1, 0, 1 ], uv: [ 1, 0 ], },
- { pos: [ 0, 1, 1 ], uv: [ 0, 1 ], },
- { pos: [ 1, 1, 1 ], uv: [ 1, 1 ], },
- ],
- },
- ];
- function main() {
- const canvas = document.querySelector( '#c' );
- const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
- const cellSize = 32;
- const fov = 75;
- const aspect = 2; // the canvas default
- const near = 0.1;
- const far = 1000;
- const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
- camera.position.set( - cellSize * .3, cellSize * .8, - cellSize * .3 );
- const controls = new OrbitControls( camera, canvas );
- controls.target.set( cellSize / 2, cellSize / 3, cellSize / 2 );
- controls.update();
- const scene = new THREE.Scene();
- scene.background = new THREE.Color( 'lightblue' );
- function addLight( x, y, z ) {
- const color = 0xFFFFFF;
- const intensity = 3;
- const light = new THREE.DirectionalLight( color, intensity );
- light.position.set( x, y, z );
- scene.add( light );
- }
- addLight( - 1, 2, 4 );
- addLight( 1, - 1, - 2 );
- const loader = new THREE.TextureLoader();
- const texture = loader.load( 'resources/images/minecraft/flourish-cc-by-nc-sa.png', render );
- texture.magFilter = THREE.NearestFilter;
- texture.minFilter = THREE.NearestFilter;
- texture.colorSpace = THREE.SRGBColorSpace;
- const tileSize = 16;
- const tileTextureWidth = 256;
- const tileTextureHeight = 64;
- const world = new VoxelWorld( {
- cellSize,
- tileSize,
- tileTextureWidth,
- tileTextureHeight,
- } );
- for ( let y = 0; y < cellSize; ++ y ) {
- for ( let z = 0; z < cellSize; ++ z ) {
- for ( let x = 0; x < cellSize; ++ x ) {
- const height = ( Math.sin( x / cellSize * Math.PI * 2 ) + Math.sin( z / cellSize * Math.PI * 3 ) ) * ( cellSize / 6 ) + ( cellSize / 2 );
- if ( y < height ) {
- world.setVoxel( x, y, z, randInt( 1, 17 ) );
- }
- }
- }
- }
- function randInt( min, max ) {
- return Math.floor( Math.random() * ( max - min ) + min );
- }
- const { positions, normals, uvs, indices } = world.generateGeometryDataForCell( 0, 0, 0 );
- const geometry = new THREE.BufferGeometry();
- const material = new THREE.MeshLambertMaterial( {
- map: texture,
- side: THREE.DoubleSide,
- alphaTest: 0.1,
- transparent: true,
- } );
- const positionNumComponents = 3;
- const normalNumComponents = 3;
- const uvNumComponents = 2;
- geometry.setAttribute(
- 'position',
- new THREE.BufferAttribute( new Float32Array( positions ), positionNumComponents ) );
- geometry.setAttribute(
- 'normal',
- new THREE.BufferAttribute( new Float32Array( normals ), normalNumComponents ) );
- geometry.setAttribute(
- 'uv',
- new THREE.BufferAttribute( new Float32Array( uvs ), uvNumComponents ) );
- geometry.setIndex( indices );
- const mesh = new THREE.Mesh( geometry, material );
- scene.add( mesh );
- 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;
- }
- let renderRequested = false;
- function render() {
- renderRequested = undefined;
- if ( resizeRendererToDisplaySize( renderer ) ) {
- const canvas = renderer.domElement;
- camera.aspect = canvas.clientWidth / canvas.clientHeight;
- camera.updateProjectionMatrix();
- }
- controls.update();
- renderer.render( scene, camera );
- }
- render();
- function requestRenderIfNotRequested() {
- if ( ! renderRequested ) {
- renderRequested = true;
- requestAnimationFrame( render );
- }
- }
- controls.addEventListener( 'change', requestRenderIfNotRequested );
- window.addEventListener( 'resize', requestRenderIfNotRequested );
- }
- main();
- </script>
- </html>
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