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Block Cut
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Block Cut
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<!-- Game canvas -->
<canvas id="c"></canvas>
<!-- Gameplay HUD -->
<div class="hud">
<div class="hud__score">
<div class="score-lbl"></div>
<div class="cube-count-lbl"></div>
</div>
<div class="pause-btn"><div></div></div>
<div class="slowmo">
<div class="slowmo__bar"></div>
</div>
</div>
<!-- Menu System -->
<div class="menus">
<div class="menu menu--main">
<h1>MENJA</h1>
<button type="button" class="play-normal-btn">PLAY GAME</button>
<button type="button" class="play-casual-btn">CASUAL MODE</button>
<div class="credits">An 8kB game by <a href="https://cmiller.tech">Caleb Miller</a></div>
</div>
<div class="menu menu--pause">
<h1>Paused</h1>
<button type="button" class="resume-btn">RESUME GAME</button>
<button type="button" class="menu-btn--pause">MAIN MENU</button>
</div>
<div class="menu menu--score">
<h1>Game Over</h1>
<h2>Your Score:</h2>
<div class="final-score-lbl"></div>
<div class="high-score-lbl"></div>
<button type="button" class="play-again-btn">PLAY AGAIN</button>
<button type="button" class="menu-btn--score">MAIN MENU</button>
</div>
</div>
<style>
body {
margin: 0;
background-color: #000;
background-image: radial-gradient(ellipse at top, #335476 0.0%, #31506e 11.1%, #304b67 22.2%, #2f4760 33.3%, #2d4359 44.4%, #2c3f51 55.6%, #2a3a4a 66.7%, #293643 77.8%, #28323d 88.9%, #262e36 100.0%);
height: 100vh;
overflow: hidden;
font-family: monospace;
font-weight: bold;
letter-spacing: 0.06em;
color: rgba(255, 255, 255, 0.75);
}
#c {
display: block;
touch-action: none;
transform: translateZ(0);
}
/*/////////////////////
// HUD //
/////////////////////*/
.hud__score,
.pause-btn {
position: fixed;
font-size: calc(14px + 2vw + 1vh);
}
.hud__score {
top: 0.65em;
left: 0.65em;
pointer-events: none;
user-select: none;
}
.cube-count-lbl {
font-size: 0.46em;
}
.pause-btn {
position: fixed;
top: 0;
right: 0;
padding: 0.8em 0.65em;
}
.pause-btn > div {
position: relative;
width: 0.8em;
height: 0.8em;
opacity: 0.75;
}
.pause-btn > div::before,
.pause-btn > div::after {
content: '';
display: block;
width: 34%;
height: 100%;
position: absolute;
background-color: #fff;
}
.pause-btn > div::after {
right: 0;
}
.slowmo {
position: fixed;
bottom: 0;
width: 100%;
pointer-events: none;
opacity: 0;
transition: opacity 0.4s;
will-change: opacity;
}
.slowmo::before {
content: 'SLOW-MO';
display: block;
font-size: calc(8px + 1vw + 0.5vh);
margin-left: 0.5em;
margin-bottom: 8px;
}
.slowmo::after {
content: '';
display: block;
position: fixed;
bottom: 0;
width: 100%;
height: 1.5vh;
background-color: rgba(0, 0, 0, 0.25);
z-index: -1;
}
.slowmo__bar {
height: 1.5vh;
background-color: rgba(255, 255, 255, 0.75);
transform-origin: 0 0;
}
/*/////////////////////
// MENUS //
/////////////////////*/
.menus::before {
content: '';
pointer-events: none;
position: fixed;
top: 0;
right: 0;
bottom: 0;
left: 0;
background-color: #000;
opacity: 0;
transition: opacity 0.2s;
transition-timing-function: ease-in;
}
.menus.has-active::before {
opacity: 0.08;
transition-duration: 0.4s;
transition-timing-function: ease-out;
}
.menus.interactive-mode::before {
opacity: 0.02;
}
/* Menu containers */
.menu {
pointer-events: none;
position: fixed;
top: 0;
right: 0;
bottom: 0;
left: 0;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
user-select: none;
text-align: center;
color: rgba(255, 255, 255, 0.9);
opacity: 0;
visibility: hidden;
transform: translateY(30px);
transition-property: opacity, visibility, transform;
transition-duration: 0.2s;
transition-timing-function: ease-in;
}
.menu.active {
opacity: 1;
visibility: visible;
transform: translateY(0);
transition-duration: 0.4s;
transition-timing-function: ease-out;
}
.menus.interactive-mode .menu.active {
opacity: 0.6;
}
.menus:not(.interactive-mode) .menu.active > * {
pointer-events: auto;
}
/* Common menu elements */
h1 {
font-size: 4rem;
line-height: 0.95;
text-align: center;
font-weight: bold;
margin: 0 0.65em 1em;
}
h2 {
font-size: 1.2rem;
line-height: 1;
text-align: center;
font-weight: bold;
margin: -1em 0.65em 1em;
}
.final-score-lbl {
font-size: 5rem;
margin: -0.2em 0 0;
}
.high-score-lbl {
font-size: 1.2rem;
margin: 0 0 2.5em;
}
button {
display: block;
position: relative;
width: 200px;
padding: 12px 20px;
background: transparent;
border: none;
outline: none;
user-select: none;
font-family: monospace;
font-weight: bold;
font-size: 1.4rem;
color: #fff;
opacity: 0.75;
transition: opacity 0.3s;
}
button::before {
content: '';
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
background-color: rgba(255, 255, 255, 0.15);
transform: scale(0, 0);
opacity: 0;
transition: opacity 0.3s, transform 0.3s;
}
/* No `:focus` styles because this is a mouse/touch game! */
button:active {
opacity: 1;
}
button:active::before {
transform: scale(1, 1);
opacity: 1;
}
.credits {
position: fixed;
width: 100%;
left: 0;
bottom: 20px;
}
a {
color: white;
}
/* Only enable hover state on large screens */
@media (min-width: 1025px) {
button:hover {
opacity: 1;
}
button:hover::before {
transform: scale(1, 1);
opacity: 1;
}
}
</style>
<script>
// globalConfig.js
// ============================================================================
// ============================================================================
// Provides global variables used by the entire program.
// Most of this should be configuration.
// Timing multiplier for entire game engine.
let gameSpeed = 1;
// Colors
const BLUE = { r: 0x67, g: 0xd7, b: 0xf0 };
const GREEN = { r: 0xa6, g: 0xe0, b: 0x2c };
const PINK = { r: 0xfa, g: 0x24, b: 0x73 };
const ORANGE = { r: 0xfe, g: 0x95, b: 0x22 };
const allColors = [BLUE, GREEN, PINK, ORANGE];
// Gameplay
const getSpawnDelay = () => {
const spawnDelayMax = 1400;
const spawnDelayMin = 550;
const spawnDelay = spawnDelayMax - state.game.cubeCount * 3.1;
return Math.max(spawnDelay, spawnDelayMin);
}
const doubleStrongEnableScore = 2000;
// Number of cubes that must be smashed before activating a feature.
const slowmoThreshold = 10;
const strongThreshold = 25;
const spinnerThreshold = 25;
// Interaction state
let pointerIsDown = false;
// The last known position of the primary pointer in screen coordinates.`
let pointerScreen = { x: 0, y: 0 };
// Same as `pointerScreen`, but converted to scene coordinates in rAF.
let pointerScene = { x: 0, y: 0 };
// Minimum speed of pointer before "hits" are counted.
const minPointerSpeed = 60;
// The hit speed affects the direction the target post-hit. This number dampens that force.
const hitDampening = 0.1;
// Backboard receives shadows and is the farthest negative Z position of entities.
const backboardZ = -400;
const shadowColor = '#262e36';
// How much air drag is applied to standard objects
const airDrag = 0.022;
const gravity = 0.3;
// Spark config
const sparkColor = 'rgba(170,221,255,.9)';
const sparkThickness = 2.2;
const airDragSpark = 0.1;
// Track pointer positions to show trail
const touchTrailColor = 'rgba(170,221,255,.62)';
const touchTrailThickness = 7;
const touchPointLife = 120;
const touchPoints = [];
// Size of in-game targets. This affects rendered size and hit area.
const targetRadius = 40;
const targetHitRadius = 50;
const makeTargetGlueColor = target => {
// const alpha = (target.health - 1) / (target.maxHealth - 1);
// return `rgba(170,221,255,${alpha.toFixed(3)})`;
return 'rgb(170,221,255)';
};
// Size of target fragments
const fragRadius = targetRadius / 3;
// Game canvas element needed in setup.js and interaction.js
const canvas = document.querySelector('#c');
// 3D camera config
// Affects perspective
const cameraDistance = 900;
// Does not affect perspective
const sceneScale = 1;
// Objects that get too close to the camera will be faded out to transparent over this range.
// const cameraFadeStartZ = 0.8*cameraDistance - 6*targetRadius;
const cameraFadeStartZ = 0.45*cameraDistance;
const cameraFadeEndZ = 0.65*cameraDistance;
const cameraFadeRange = cameraFadeEndZ - cameraFadeStartZ;
// Globals used to accumlate all vertices/polygons in each frame
const allVertices = [];
const allPolys = [];
const allShadowVertices = [];
const allShadowPolys = [];
// state.js
// ============================================================================
// ============================================================================
///////////
// Enums //
///////////
// Game Modes
const GAME_MODE_RANKED = Symbol('GAME_MODE_RANKED');
const GAME_MODE_CASUAL = Symbol('GAME_MODE_CASUAL');
// Available Menus
const MENU_MAIN = Symbol('MENU_MAIN');
const MENU_PAUSE = Symbol('MENU_PAUSE');
const MENU_SCORE = Symbol('MENU_SCORE');
//////////////////
// Global State //
//////////////////
const state = {
game: {
mode: GAME_MODE_RANKED,
// Run time of current game.
time: 0,
// Player score.
score: 0,
// Total number of cubes smashed in game.
cubeCount: 0
},
menus: {
// Set to `null` to hide all menus
active: MENU_MAIN
}
};
////////////////////////////
// Global State Selectors //
////////////////////////////
const isInGame = () => !state.menus.active;
const isMenuVisible = () => !!state.menus.active;
const isCasualGame = () => state.game.mode === GAME_MODE_CASUAL;
const isPaused = () => state.menus.active === MENU_PAUSE;
///////////////////
// Local Storage //
///////////////////
const highScoreKey = '__menja__highScore';
const getHighScore = () => {
const raw = localStorage.getItem(highScoreKey);
return raw ? parseInt(raw, 10) : 0;
};
let _lastHighscore = getHighScore();
const setHighScore = score => {
_lastHighscore = getHighScore();
localStorage.setItem(highScoreKey, String(score));
};
const isNewHighScore = () => state.game.score > _lastHighscore;
// utils.js
// ============================================================================
// ============================================================================
const invariant = (condition, message) => {
if (!condition) throw new Error(message);
};
/////////
// DOM //
/////////
const $ = selector => document.querySelector(selector);
const handleClick = (element, handler) => element.addEventListener('click', handler);
const handlePointerDown = (element, handler) => {
element.addEventListener('touchstart', handler);
element.addEventListener('mousedown', handler);
};
////////////////////////
// Formatting Helpers //
////////////////////////
// Converts a number into a formatted string with thousand separators.
const formatNumber = num => num.toLocaleString();
////////////////////
// Math Constants //
////////////////////
const PI = Math.PI;
const TAU = Math.PI * 2;
const ETA = Math.PI * 0.5;
//////////////////
// Math Helpers //
//////////////////
// Clamps a number between min and max values (inclusive)
const clamp = (num, min, max) => Math.min(Math.max(num, min), max);
// Linearly interpolate between numbers a and b by a specific amount.
// mix >= 0 && mix <= 1
const lerp = (a, b, mix) => (b - a) * mix + a;
////////////////////
// Random Helpers //
////////////////////
// Generates a random number between min (inclusive) and max (exclusive)
const random = (min, max) => Math.random() * (max - min) + min;
// Generates a random integer between and possibly including min and max values
const randomInt = (min, max) => ((Math.random() * (max - min + 1)) | 0) + min;
// Returns a random element from an array
const pickOne = arr => arr[Math.random() * arr.length | 0];
///////////////////
// Color Helpers //
///////////////////
// Converts an { r, g, b } color object to a 6-digit hex code.
const colorToHex = color => {
return '#' +
(color.r | 0).toString(16).padStart(2, '0') +
(color.g | 0).toString(16).padStart(2, '0') +
(color.b | 0).toString(16).padStart(2, '0');
};
// Operates on an { r, g, b } color object.
// Returns string hex code.
// `lightness` must range from 0 to 1. 0 is pure black, 1 is pure white.
const shadeColor = (color, lightness) => {
let other, mix;
if (lightness < 0.5) {
other = 0;
mix = 1 - (lightness * 2);
} else {
other = 255;
mix = lightness * 2 - 1;
}
return '#' +
(lerp(color.r, other, mix) | 0).toString(16).padStart(2, '0') +
(lerp(color.g, other, mix) | 0).toString(16).padStart(2, '0') +
(lerp(color.b, other, mix) | 0).toString(16).padStart(2, '0');
};
////////////////////
// Timing Helpers //
////////////////////
const _allCooldowns = [];
const makeCooldown = (rechargeTime, units=1) => {
let timeRemaining = 0;
let lastTime = 0;
const initialOptions = { rechargeTime, units };
const updateTime = () => {
const now = state.game.time;
// Reset time remaining if time goes backwards.
if (now < lastTime) {
timeRemaining = 0;
} else {
// update...
timeRemaining -= now-lastTime;
if (timeRemaining < 0) timeRemaining = 0;
}
lastTime = now;
};
const canUse = () => {
updateTime();
return timeRemaining <= (rechargeTime * (units-1));
};
const cooldown = {
canUse,
useIfAble() {
const usable = canUse();
if (usable) timeRemaining += rechargeTime;
return usable;
},
mutate(options) {
if (options.rechargeTime) {
// Apply recharge time delta so change takes effect immediately.
timeRemaining -= rechargeTime-options.rechargeTime;
if (timeRemaining < 0) timeRemaining = 0;
rechargeTime = options.rechargeTime;
}
if (options.units) units = options.units;
},
reset() {
timeRemaining = 0;
lastTime = 0;
this.mutate(initialOptions);
}
};
_allCooldowns.push(cooldown);
return cooldown;
};
const resetAllCooldowns = () => _allCooldowns.forEach(cooldown => cooldown.reset());
const makeSpawner = ({ chance, cooldownPerSpawn, maxSpawns }) => {
const cooldown = makeCooldown(cooldownPerSpawn, maxSpawns);
return {
shouldSpawn() {
return Math.random() <= chance && cooldown.useIfAble();
},
mutate(options) {
if (options.chance) chance = options.chance;
cooldown.mutate({
rechargeTime: options.cooldownPerSpawn,
units: options.maxSpawns
});
}
};
};
////////////////////
// Vector Helpers //
////////////////////
const normalize = v => {
const mag = Math.hypot(v.x, v.y, v.z);
return {
x: v.x / mag,
y: v.y / mag,
z: v.z / mag
};
}
// Curried math helpers
const add = a => b => a + b;
// Curried vector helpers
const scaleVector = scale => vector => {
vector.x *= scale;
vector.y *= scale;
vector.z *= scale;
};
////////////////
// 3D Helpers //
////////////////
// Clone array and all vertices.
function cloneVertices(vertices) {
return vertices.map(v => ({ x: v.x, y: v.y, z: v.z }));
}
// Copy vertex data from one array into another.
// Arrays must be the same length.
function copyVerticesTo(arr1, arr2) {
const len = arr1.length;
for (let i=0; i<len; i++) {
const v1 = arr1[i];
const v2 = arr2[i];
v2.x = v1.x;
v2.y = v1.y;
v2.z = v1.z;
}
}
// Compute triangle midpoint.
// Mutates `middle` property of given `poly`.
function computeTriMiddle(poly) {
const v = poly.vertices;
poly.middle.x = (v[0].x + v[1].x + v[2].x) / 3;
poly.middle.y = (v[0].y + v[1].y + v[2].y) / 3;
poly.middle.z = (v[0].z + v[1].z + v[2].z) / 3;
}
// Compute quad midpoint.
// Mutates `middle` property of given `poly`.
function computeQuadMiddle(poly) {
const v = poly.vertices;
poly.middle.x = (v[0].x + v[1].x + v[2].x + v[3].x) / 4;
poly.middle.y = (v[0].y + v[1].y + v[2].y + v[3].y) / 4;
poly.middle.z = (v[0].z + v[1].z + v[2].z + v[3].z) / 4;
}
function computePolyMiddle(poly) {
if (poly.vertices.length === 3) {
computeTriMiddle(poly);
} else {
computeQuadMiddle(poly);
}
}
// Compute distance from any polygon (tri or quad) midpoint to camera.
// Sets `depth` property of given `poly`.
// Also triggers midpoint calculation, which mutates `middle` property of `poly`.
function computePolyDepth(poly) {
computePolyMiddle(poly);
const dX = poly.middle.x;
const dY = poly.middle.y;
const dZ = poly.middle.z - cameraDistance;
poly.depth = Math.hypot(dX, dY, dZ);
}
// Compute normal of any polygon. Uses normalized vector cross product.
// Mutates `normalName` property of given `poly`.
function computePolyNormal(poly, normalName) {
// Store quick refs to vertices
const v1 = poly.vertices[0];
const v2 = poly.vertices[1];
const v3 = poly.vertices[2];
// Calculate difference of vertices, following winding order.
const ax = v1.x - v2.x;
const ay = v1.y - v2.y;
const az = v1.z - v2.z;
const bx = v1.x - v3.x;
const by = v1.y - v3.y;
const bz = v1.z - v3.z;
// Cross product
const nx = ay*bz - az*by;
const ny = az*bx - ax*bz;
const nz = ax*by - ay*bx;
// Compute magnitude of normal and normalize
const mag = Math.hypot(nx, ny, nz);
const polyNormal = poly[normalName];
polyNormal.x = nx / mag;
polyNormal.y = ny / mag;
polyNormal.z = nz / mag;
}
// Apply translation/rotation/scale to all given vertices.
// If `vertices` and `target` are the same array, the vertices will be mutated in place.
// If `vertices` and `target` are different arrays, `vertices` will not be touched, instead the
// transformed values from `vertices` will be written to `target` array.
function transformVertices(vertices, target, tX, tY, tZ, rX, rY, rZ, sX, sY, sZ) {
// Matrix multiplcation constants only need calculated once for all vertices.
const sinX = Math.sin(rX);
const cosX = Math.cos(rX);
const sinY = Math.sin(rY);
const cosY = Math.cos(rY);
const sinZ = Math.sin(rZ);
const cosZ = Math.cos(rZ);
// Using forEach() like map(), but with a (recycled) target array.
vertices.forEach((v, i) => {
const targetVertex = target[i];
// X axis rotation
const x1 = v.x;
const y1 = v.z*sinX + v.y*cosX;
const z1 = v.z*cosX - v.y*sinX;
// Y axis rotation
const x2 = x1*cosY - z1*sinY;
const y2 = y1;
const z2 = x1*sinY + z1*cosY;
// Z axis rotation
const x3 = x2*cosZ - y2*sinZ;
const y3 = x2*sinZ + y2*cosZ;
const z3 = z2;
// Scale, Translate, and set the transform.
targetVertex.x = x3 * sX + tX;
targetVertex.y = y3 * sY + tY;
targetVertex.z = z3 * sZ + tZ;
});
}
// 3D projection on a single vertex.
// Directly mutates the vertex.
const projectVertex = v => {
const focalLength = cameraDistance * sceneScale;
const depth = focalLength / (cameraDistance - v.z);
v.x = v.x * depth;
v.y = v.y * depth;
};
// 3D projection on a single vertex.
// Mutates a secondary target vertex.
const projectVertexTo = (v, target) => {
const focalLength = cameraDistance * sceneScale;
const depth = focalLength / (cameraDistance - v.z);
target.x = v.x * depth;
target.y = v.y * depth;
};
// PERF.js
// ============================================================================
// ============================================================================
// Dummy no-op functions.
// I use these in a special build for custom performance profiling.
const PERF_START = () => {};
const PERF_END = () => {};
const PERF_UPDATE = () => {};
// 3dModels.js
// ============================================================================
// ============================================================================
// Define models once. The origin is the center of the model.
// A simple cube, 8 vertices, 6 quads.
// Defaults to an edge length of 2 units, can be influenced with `scale`.
function makeCubeModel({ scale=1 }) {
return {
vertices: [
// top
{ x: -scale, y: -scale, z: scale },
{ x: scale, y: -scale, z: scale },
{ x: scale, y: scale, z: scale },
{ x: -scale, y: scale, z: scale },
// bottom
{ x: -scale, y: -scale, z: -scale },
{ x: scale, y: -scale, z: -scale },
{ x: scale, y: scale, z: -scale },
{ x: -scale, y: scale, z: -scale }
],
polys: [
// z = 1
{ vIndexes: [0, 1, 2, 3] },
// z = -1
{ vIndexes: [7, 6, 5, 4] },
// y = 1
{ vIndexes: [3, 2, 6, 7] },
// y = -1
{ vIndexes: [4, 5, 1, 0] },
// x = 1
{ vIndexes: [5, 6, 2, 1] },
// x = -1
{ vIndexes: [0, 3, 7, 4] }
]
};
}
// Not very optimized - lots of duplicate vertices are generated.
function makeRecursiveCubeModel({ recursionLevel, splitFn, color, scale=1 }) {
const getScaleAtLevel = level => 1 / (3 ** level);
// We can model level 0 manually. It's just a single, centered, cube.
let cubeOrigins = [{ x: 0, y: 0, z: 0 }];
// Recursively replace cubes with smaller cubes.
for (let i=1; i<=recursionLevel; i++) {
const scale = getScaleAtLevel(i) * 2;
const cubeOrigins2 = [];
cubeOrigins.forEach(origin => {
cubeOrigins2.push(...splitFn(origin, scale));
});
cubeOrigins = cubeOrigins2;
}
const finalModel = { vertices: [], polys: [] };
// Generate single cube model and scale it.
const cubeModel = makeCubeModel({ scale: 1 });
cubeModel.vertices.forEach(scaleVector(getScaleAtLevel(recursionLevel)));
// Compute the max distance x, y, or z origin values will be.
// Same result as `Math.max(...cubeOrigins.map(o => o.x))`, but much faster.
const maxComponent = getScaleAtLevel(recursionLevel) * (3 ** recursionLevel - 1);
// Place cube geometry at each origin.
cubeOrigins.forEach((origin, cubeIndex) => {
// To compute occlusion (shading), find origin component with greatest
// magnitude and normalize it relative to `maxComponent`.
const occlusion = Math.max(
Math.abs(origin.x),
Math.abs(origin.y),
Math.abs(origin.z)
) / maxComponent;
// At lower iterations, occlusion looks better lightened up a bit.
const occlusionLighter = recursionLevel > 2
? occlusion
: (occlusion + 0.8) / 1.8;
// Clone, translate vertices to origin, and apply scale
finalModel.vertices.push(
...cubeModel.vertices.map(v => ({
x: (v.x + origin.x) * scale,
y: (v.y + origin.y) * scale,
z: (v.z + origin.z) * scale
}))
);
// Clone polys, shift referenced vertex indexes, and compute color.
finalModel.polys.push(
...cubeModel.polys.map(poly => ({
vIndexes: poly.vIndexes.map(add(cubeIndex * 8))
}))
);
});
return finalModel;
}
// o: Vector3D - Position of cube's origin (center).
// s: Vector3D - Determines size of menger sponge.
function mengerSpongeSplit(o, s) {
return [
// Top
{ x: o.x + s, y: o.y - s, z: o.z + s },
{ x: o.x + s, y: o.y - s, z: o.z + 0 },
{ x: o.x + s, y: o.y - s, z: o.z - s },
{ x: o.x + 0, y: o.y - s, z: o.z + s },
{ x: o.x + 0, y: o.y - s, z: o.z - s },
{ x: o.x - s, y: o.y - s, z: o.z + s },
{ x: o.x - s, y: o.y - s, z: o.z + 0 },
{ x: o.x - s, y: o.y - s, z: o.z - s },
// Bottom
{ x: o.x + s, y: o.y + s, z: o.z + s },
{ x: o.x + s, y: o.y + s, z: o.z + 0 },
{ x: o.x + s, y: o.y + s, z: o.z - s },
{ x: o.x + 0, y: o.y + s, z: o.z + s },
{ x: o.x + 0, y: o.y + s, z: o.z - s },
{ x: o.x - s, y: o.y + s, z: o.z + s },
{ x: o.x - s, y: o.y + s, z: o.z + 0 },
{ x: o.x - s, y: o.y + s, z: o.z - s },
// Middle
{ x: o.x + s, y: o.y + 0, z: o.z + s },
{ x: o.x + s, y: o.y + 0, z: o.z - s },
{ x: o.x - s, y: o.y + 0, z: o.z + s },
{ x: o.x - s, y: o.y + 0, z: o.z - s }
];
}
// Helper to optimize models by merging duplicate vertices within a threshold,
// and removing all polys that share the same vertices.
// Directly mutates the model.
function optimizeModel(model, threshold=0.0001) {
const { vertices, polys } = model;
const compareVertices = (v1, v2) => (
Math.abs(v1.x - v2.x) < threshold &&
Math.abs(v1.y - v2.y) < threshold &&
Math.abs(v1.z - v2.z) < threshold
);
const comparePolys = (p1, p2) => {
const v1 = p1.vIndexes;
const v2 = p2.vIndexes;
return (
(
v1[0] === v2[0] ||
v1[0] === v2[1] ||
v1[0] === v2[2] ||
v1[0] === v2[3]
) && (
v1[1] === v2[0] ||
v1[1] === v2[1] ||
v1[1] === v2[2] ||