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288 lines
7.3 KiB
288 lines
7.3 KiB
3 years 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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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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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({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 = 1;
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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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