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348 lines
6.9 KiB
HTML
348 lines
6.9 KiB
HTML
2 months ago
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<!-- Licensed under a BSD license. See license.html for license -->
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>Three.js - Voxel Geometry - Culled Faces</title>
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<style>
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html, body {
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height: 100%;
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margin: 0;
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}
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#c {
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width: 100%;
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height: 100%;
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display: block;
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}
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</style>
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</head>
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<body>
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<canvas id="c"></canvas>
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</body>
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<script type="importmap">
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{
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"imports": {
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"three": "../../build/three.module.js",
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"three/addons/": "../../examples/jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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class VoxelWorld {
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constructor( cellSize ) {
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this.cellSize = cellSize;
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this.cellSliceSize = cellSize * cellSize;
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this.cell = new Uint8Array( cellSize * cellSize * cellSize );
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}
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computeVoxelOffset( x, y, z ) {
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const { cellSize, cellSliceSize } = this;
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const voxelX = THREE.MathUtils.euclideanModulo( x, cellSize ) | 0;
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const voxelY = THREE.MathUtils.euclideanModulo( y, cellSize ) | 0;
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const voxelZ = THREE.MathUtils.euclideanModulo( z, cellSize ) | 0;
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return voxelY * cellSliceSize +
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voxelZ * cellSize +
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voxelX;
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}
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getCellForVoxel( x, y, z ) {
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const { cellSize } = this;
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const cellX = Math.floor( x / cellSize );
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const cellY = Math.floor( y / cellSize );
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const cellZ = Math.floor( z / cellSize );
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if ( cellX !== 0 || cellY !== 0 || cellZ !== 0 ) {
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return null;
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}
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return this.cell;
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}
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setVoxel( x, y, z, v ) {
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const cell = this.getCellForVoxel( x, y, z );
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if ( ! cell ) {
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return; // TODO: add a new cell?
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}
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const voxelOffset = this.computeVoxelOffset( x, y, z );
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cell[ voxelOffset ] = v;
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}
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getVoxel( x, y, z ) {
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const cell = this.getCellForVoxel( x, y, z );
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if ( ! cell ) {
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return 0;
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}
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const voxelOffset = this.computeVoxelOffset( x, y, z );
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return cell[ voxelOffset ];
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}
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generateGeometryDataForCell( cellX, cellY, cellZ ) {
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const { cellSize } = this;
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const positions = [];
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const normals = [];
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const indices = [];
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const startX = cellX * cellSize;
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const startY = cellY * cellSize;
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const startZ = cellZ * cellSize;
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for ( let y = 0; y < cellSize; ++ y ) {
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const voxelY = startY + y;
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for ( let z = 0; z < cellSize; ++ z ) {
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const voxelZ = startZ + z;
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for ( let x = 0; x < cellSize; ++ x ) {
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const voxelX = startX + x;
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const voxel = this.getVoxel( voxelX, voxelY, voxelZ );
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if ( voxel ) {
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// There is a voxel here but do we need faces for it?
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for ( const { dir, corners } of VoxelWorld.faces ) {
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const neighbor = this.getVoxel(
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voxelX + dir[ 0 ],
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voxelY + dir[ 1 ],
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voxelZ + dir[ 2 ] );
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if ( ! neighbor ) {
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// this voxel has no neighbor in this direction so we need a face.
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const ndx = positions.length / 3;
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for ( const pos of corners ) {
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positions.push( pos[ 0 ] + x, pos[ 1 ] + y, pos[ 2 ] + z );
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normals.push( ...dir );
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}
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indices.push(
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ndx, ndx + 1, ndx + 2,
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ndx + 2, ndx + 1, ndx + 3,
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);
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}
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}
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}
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}
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}
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}
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return {
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positions,
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normals,
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indices,
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};
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}
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}
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VoxelWorld.faces = [
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{ // left
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dir: [ - 1, 0, 0, ],
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corners: [
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[ 0, 1, 0 ],
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[ 0, 0, 0 ],
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[ 0, 1, 1 ],
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[ 0, 0, 1 ],
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],
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},
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{ // right
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dir: [ 1, 0, 0, ],
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corners: [
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[ 1, 1, 1 ],
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[ 1, 0, 1 ],
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[ 1, 1, 0 ],
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[ 1, 0, 0 ],
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],
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},
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{ // bottom
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dir: [ 0, - 1, 0, ],
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corners: [
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[ 1, 0, 1 ],
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[ 0, 0, 1 ],
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[ 1, 0, 0 ],
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[ 0, 0, 0 ],
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],
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},
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{ // top
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dir: [ 0, 1, 0, ],
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corners: [
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[ 0, 1, 1 ],
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[ 1, 1, 1 ],
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[ 0, 1, 0 ],
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[ 1, 1, 0 ],
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],
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},
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{ // back
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dir: [ 0, 0, - 1, ],
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corners: [
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[ 1, 0, 0 ],
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[ 0, 0, 0 ],
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[ 1, 1, 0 ],
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[ 0, 1, 0 ],
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],
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},
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{ // front
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dir: [ 0, 0, 1, ],
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corners: [
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[ 0, 0, 1 ],
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[ 1, 0, 1 ],
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[ 0, 1, 1 ],
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[ 1, 1, 1 ],
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],
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},
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];
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function main() {
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const canvas = document.querySelector( '#c' );
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const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
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const cellSize = 32;
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const fov = 75;
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const aspect = 2; // the canvas default
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const near = 0.1;
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const far = 1000;
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const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
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camera.position.set( - cellSize * .3, cellSize * .8, - cellSize * .3 );
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const controls = new OrbitControls( camera, canvas );
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controls.target.set( cellSize / 2, cellSize / 3, cellSize / 2 );
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controls.update();
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const scene = new THREE.Scene();
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scene.background = new THREE.Color( 'lightblue' );
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function addLight( x, y, z ) {
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const color = 0xFFFFFF;
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const intensity = 3;
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const light = new THREE.DirectionalLight( color, intensity );
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light.position.set( x, y, z );
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scene.add( light );
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}
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addLight( - 1, 2, 4 );
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addLight( 1, - 1, - 2 );
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const world = new VoxelWorld( cellSize );
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for ( let y = 0; y < cellSize; ++ y ) {
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for ( let z = 0; z < cellSize; ++ z ) {
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for ( let x = 0; x < cellSize; ++ x ) {
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const height = ( Math.sin( x / cellSize * Math.PI * 2 ) + Math.sin( z / cellSize * Math.PI * 3 ) ) * ( cellSize / 6 ) + ( cellSize / 2 );
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if ( y < height ) {
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world.setVoxel( x, y, z, 1 );
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}
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}
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}
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}
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const { positions, normals, indices } = world.generateGeometryDataForCell( 0, 0, 0 );
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const geometry = new THREE.BufferGeometry();
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const material = new THREE.MeshLambertMaterial( { color: 'green' } );
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const positionNumComponents = 3;
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const normalNumComponents = 3;
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geometry.setAttribute(
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'position',
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new THREE.BufferAttribute( new Float32Array( positions ), positionNumComponents ) );
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geometry.setAttribute(
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'normal',
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new THREE.BufferAttribute( new Float32Array( normals ), normalNumComponents ) );
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geometry.setIndex( indices );
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const mesh = new THREE.Mesh( geometry, material );
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scene.add( mesh );
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function resizeRendererToDisplaySize( renderer ) {
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const canvas = renderer.domElement;
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const width = canvas.clientWidth;
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const height = canvas.clientHeight;
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const needResize = canvas.width !== width || canvas.height !== height;
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if ( needResize ) {
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renderer.setSize( width, height, false );
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}
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return needResize;
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}
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let renderRequested = false;
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function render() {
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renderRequested = undefined;
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if ( resizeRendererToDisplaySize( renderer ) ) {
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const canvas = renderer.domElement;
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camera.aspect = canvas.clientWidth / canvas.clientHeight;
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camera.updateProjectionMatrix();
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}
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controls.update();
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renderer.render( scene, camera );
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}
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render();
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function requestRenderIfNotRequested() {
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if ( ! renderRequested ) {
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renderRequested = true;
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requestAnimationFrame( render );
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}
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}
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controls.addEventListener( 'change', requestRenderIfNotRequested );
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window.addEventListener( 'resize', requestRenderIfNotRequested );
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}
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main();
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</script>
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</html>
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