402 lines
29 KiB
HTML
402 lines
29 KiB
HTML
|
<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"/><meta content="width=device-width, initial-scale=1" name="viewport"/><title> <loganGatlin/> </title><link href="resources/favicon.svg" type="image/x-icon" rel="icon"/><style>
|
||
|
|
/*!
|
||
|
|
Pure v3.0.0
|
||
|
|
Copyright 2013 Yahoo!
|
||
|
|
Licensed under the BSD License.
|
||
|
|
https://github.com/pure-css/pure/blob/master/LICENSE
|
||
|
|
*/
|
||
|
|
/*!
|
||
|
|
normalize.css v | MIT License | https://necolas.github.io/normalize.css/
|
||
|
|
Copyright (c) Nicolas Gallagher and Jonathan Neal
|
||
|
|
*/
|
||
|
|
/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */html{line-height:1.15;-webkit-text-size-adjust:100%}body{margin:0}main{display:block}h1{font-size:2em;margin:.67em 0}hr{box-sizing:content-box;height:0;overflow:visible}pre{font-family:monospace,monospace;font-size:1em}a{background-color:transparent}abbr[title]{border-bottom:none;text-decoration:underline;-webkit-text-decoration:underline dotted;text-decoration:underline dotted}b,strong{font-weight:bolder}code,kbd,samp{font-family:monospace,monospace;font-size:1em}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}img{border-style:none}button,input,optgroup,select,textarea{font-family:inherit;font-size:100%;line-height:1.15;margin:0}button,input{overflow:visible}button,select{text-transform:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]::-moz-focus-inner,[type=reset]::-moz-focus-inner,[type=submit]::-moz-focus-inner,button::-moz-focus-inner{border-style:none;padding:0}[type=button]:-moz-focusring,[type=reset]:-moz-focusring,[type=submit]:-moz-focusring,button:-moz-focusring{outline:1px dotted ButtonText}fieldset{padding:.35em .75em .625em}legend{box-sizing:border-box;color:inherit;display:table;max-width:100%;padding:0;white-space:normal}progress{vertical-align:baseline}textarea{overflow:auto}[type=checkbox],[type=radio]{box-sizing:border-box;padding:0}[type=number]::-webkit-inner-spin-button,[type=number]::-webkit-outer-spin-button{height:auto}[type=search]{-webkit-appearance:textfield;outline-offset:-2px}[type=search]::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}details{display:block}summary{display:list-item}template{display:none}[hidden]{display:none}html{font-family:sans-serif}.hidden,[hidden]{display:none!important}.pure-img{max-width:100%;height:auto;display:block}.pure-g{display:flex;flex-flow:row wrap;align-content:flex-start}.pure-u{display:inline-block;vertical-align:top}.pure-u-1,.pure-u-1-1,.pure-u-1-12,.pure-u-1-2,.pure-u-1-24,.pure-u-1-3,.pure-u-1-4,.pure-u-1-5,.pure-u-1-6,.pure-u-1-8,.pure-u-10-24,.pure-u-11-12,.pure-u-11-24,.pure-u-12-24,.pure-u-13-24,.pure-u-14-24,.pure-u-15-24,.pure-u-16-24,.pure-u-17-24,.pure-u-18-24,.pure-u-19-24,.pure-u-2-24,.pure-u-2-3,.pure-u-2-5,.pure-u-20-24,.pure-u-21-24,.pure-u-22-24,.pure-u-23-24,.pure-u-24-24,.pure-u-3-24,.pure-u-3-4,.pure-u-3-5,.pure-u-3-8,.pure-u-4-24,.pure-u-4-5,.pure-u-5-12,.pure-u-5-24,.pure-u-5-5,.pure-u-5-6,.pure-u-5-8,.pure-u-6-24,.pure-u-7-12,.pure-u-7-24,.pure-u-7-8,.pure-u-8-24,.pure-u-9-24{display:inline-block;letter-spacing:normal;word-spacing:normal;vertical-align:top;text-rendering:auto}.pure-u-1-24{width:4.1667%}.pure-u-1-12,.pure-u-2-24{width:8.3333%}.pure-u-1-8,.pure-u-3-24{width:12.5%}.pure-u-1-6,.pure-u-4-24{width:16.6667%}.pure-u-1-5{width:20%}.pure-u-5-24{width:20.8333%}.pure-u-1-4,.pure-u-6-24{width:25%}.pure-u-7-24{width:29.1667%}.pure-u-1-3,.pure-u-8-24{width:33.3333%}.pure-u-3-8,.pure-u-9-24{width:37.5%}.pure-u-2-5{width:40%}.pure-u-10-24,.pure-u-5-12{width:41.6667%}.pure-u-11-24{width:45.8333%}.pure-u-1-2,.pure-u-12-24{width:50%}.pure-u-13-24{width:54.1667%}.pure-u-14-24,.pure-u-7-12{width:58.3333%}.pure-u-3-5{width:60%}.pure-u-15-24,.pure-u-5-8{width:62.5%}.pure-u-16-24,.pure-u-2-3{width:66.6667%}.pure-u-17-24{width:70.8333%}.pure-u-18-24,.pure-u-3-4{width:75%}.pure-u-19-24{width:79.1667%}.pure-u-4-5{width:80%}.pure-u-20-24,.pure-u-5-6{width:83.3333%}.pure-u-21-24,.pure-u-7-8{width:87.5%}.pure-u-11-12,.pure-u-22-24{width:91.6667%}.pure-u-23-24{width:95.8333%}.pure-u-1,.pure-u-1-1,.pure-u-24-24,.pure-u-5-5{width:100%}.pure-button{display:inline-block;line-height:normal;white-space:nowrap;vertical-align:middle;text-align:center;cursor:pointer;-webkit-user-drag:none;-webkit-user-select:none;user-select:none;box-sizing:border-box}.pure-button::-moz-focus-inner{padding:0;border:0}.pure-button-group{letter-spacing:-.31em;text-rendering:optimizespeed}.opera-only :-o-
|
||
|
|
</style><style>
|
||
|
|
@font-face {
|
||
|
|
font-family: Cascadia;
|
||
|
|
src: url("/resources/CascadiaMonoPL.woff2");
|
||
|
|
}
|
||
|
|
|
||
|
|
body {
|
||
|
|
color: #444;
|
||
|
|
font-size: 1.2em;
|
||
|
|
}
|
||
|
|
|
||
|
|
.link {
|
||
|
|
text-decoration: none;
|
||
|
|
color: #1e90ff;
|
||
|
|
}
|
||
|
|
|
||
|
|
.link :visited {
|
||
|
|
color: #1e90ff;
|
||
|
|
}
|
||
|
|
|
||
|
|
table {
|
||
|
|
display: block;
|
||
|
|
margin-top: 1em;
|
||
|
|
margin-bottom: 1em;
|
||
|
|
margin-left: auto;
|
||
|
|
margin-right: auto;
|
||
|
|
width: 60%;
|
||
|
|
|
||
|
|
text-align: left;
|
||
|
|
border-collapse: collapse;
|
||
|
|
}
|
||
|
|
|
||
|
|
th {
|
||
|
|
padding: 0.25em 0.25em 0.25em 0.25em;
|
||
|
|
border: 2px solid;
|
||
|
|
border-collapse: collapse;
|
||
|
|
}
|
||
|
|
|
||
|
|
td {
|
||
|
|
padding: 0.25em 0.25em 0.25em 0.25em;
|
||
|
|
border: 2px solid;
|
||
|
|
border-collapse: collapse;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* https://css-loaders.com/spinner/ */
|
||
|
|
/* HTML: <div class="loader"></div> */
|
||
|
|
.loading {
|
||
|
|
width: 512px;
|
||
|
|
padding: 8px;
|
||
|
|
aspect-ratio: 1;
|
||
|
|
border-radius: 50%;
|
||
|
|
background: #25b09b;
|
||
|
|
--_m:
|
||
|
|
conic-gradient(#0000 10%,#000),
|
||
|
|
linear-gradient(#000 0 0) content-box;
|
||
|
|
-webkit-mask: var(--_m);
|
||
|
|
mask: var(--_m);
|
||
|
|
-webkit-mask-composite: source-out;
|
||
|
|
mask-composite: subtract;
|
||
|
|
animation: l3 1s infinite linear;
|
||
|
|
}
|
||
|
|
@keyframes l3 {to{transform: rotate(1turn)}}
|
||
|
|
|
||
|
|
|
||
|
|
.centered {
|
||
|
|
display: block;
|
||
|
|
margin-top: 1em;
|
||
|
|
margin-bottom: 1em;
|
||
|
|
margin-left: auto;
|
||
|
|
margin-right: auto;
|
||
|
|
width: 50%;
|
||
|
|
}
|
||
|
|
|
||
|
|
.pure-img-responsive { max-width: 100%; height: auto;
|
||
|
|
}
|
||
|
|
|
||
|
|
.cascadia {
|
||
|
|
font-family: Cascadia;
|
||
|
|
}
|
||
|
|
|
||
|
|
.home-menu {
|
||
|
|
padding: 0.5em;
|
||
|
|
text-align: center;
|
||
|
|
box-shadow: 0 1px 1px rgba(0,0,0, 0.10);
|
||
|
|
}
|
||
|
|
.home-menu {
|
||
|
|
background: #333;
|
||
|
|
}
|
||
|
|
|
||
|
|
.home-menu a {
|
||
|
|
color: #ccc;
|
||
|
|
}
|
||
|
|
|
||
|
|
.home-menu li a:hover,
|
||
|
|
.home-menu li a:focus {
|
||
|
|
animation: menu-hover-anim 0.25s ease-out;
|
||
|
|
animation-fill-mode: forwards;
|
||
|
|
background: none;
|
||
|
|
border: none;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
.link {
|
||
|
|
color: #00f;
|
||
|
|
text-decoration: none;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
.video {
|
||
|
|
text-align: center;
|
||
|
|
}
|
||
|
|
|
||
|
|
.video iframe {
|
||
|
|
width: 32em;
|
||
|
|
height: 18em;
|
||
|
|
frameborder: "0";
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
Add transition to containers so they can push in and out.
|
||
|
|
*/
|
||
|
|
#layout,
|
||
|
|
#menu,
|
||
|
|
.menu-link {
|
||
|
|
-webkit-transition: all 0.2s ease-out;
|
||
|
|
-moz-transition: all 0.2s ease-out;
|
||
|
|
-ms-transition: all 0.2s ease-out;
|
||
|
|
-o-transition: all 0.2s ease-out;
|
||
|
|
transition: all 0.2s ease-out;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
This is the parent `<div>` that contains the menu and the content area.
|
||
|
|
*/
|
||
|
|
#layout {
|
||
|
|
position: relative;
|
||
|
|
left: 0;
|
||
|
|
padding-left: 0;
|
||
|
|
}
|
||
|
|
#layout.active #menu {
|
||
|
|
left: 150px;
|
||
|
|
width: 150px;
|
||
|
|
}
|
||
|
|
|
||
|
|
#layout.active .menu-link {
|
||
|
|
left: 150px;
|
||
|
|
}
|
||
|
|
/*
|
||
|
|
The content `<div>` is where all your content goes.
|
||
|
|
*/
|
||
|
|
.content {
|
||
|
|
margin: 0 auto;
|
||
|
|
padding: 0 2em;
|
||
|
|
max-width: 800px;
|
||
|
|
margin-bottom: 50px;
|
||
|
|
line-height: 1.6em;
|
||
|
|
text-align: justify;
|
||
|
|
}
|
||
|
|
|
||
|
|
.header {
|
||
|
|
margin: 0;
|
||
|
|
color: #444;
|
||
|
|
text-align: center;
|
||
|
|
padding: 2.5em 4em 0;
|
||
|
|
border-bottom: 1px solid #eee;
|
||
|
|
}
|
||
|
|
.header h1 {
|
||
|
|
margin: 0.2em 0;
|
||
|
|
font-size: 2.5em;
|
||
|
|
font-weight: bold;
|
||
|
|
}
|
||
|
|
.header h2 {
|
||
|
|
font-weight: 300;
|
||
|
|
color: #888;
|
||
|
|
padding: 0;
|
||
|
|
margin-top: 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
.distinct {
|
||
|
|
background-color: #444;
|
||
|
|
color: #fff;
|
||
|
|
padding: 0.5em 0.5em 0.5em 0.5em;
|
||
|
|
}
|
||
|
|
|
||
|
|
@keyframes card-hover-anim {
|
||
|
|
to {background-color: #ccc;}
|
||
|
|
}
|
||
|
|
@keyframes card-text-hover-anim {
|
||
|
|
to {color: #222;}
|
||
|
|
}
|
||
|
|
|
||
|
|
.spaced {
|
||
|
|
padding: 0.5em 0.5em 0.5em 0.5em;
|
||
|
|
margin: 1em 0em 1em 0em;
|
||
|
|
}
|
||
|
|
|
||
|
|
h1 a svg {
|
||
|
|
vertical-align: middle;
|
||
|
|
}
|
||
|
|
|
||
|
|
.card {
|
||
|
|
background-color: #eee;
|
||
|
|
text-decoration: none;
|
||
|
|
text-align: left;
|
||
|
|
}
|
||
|
|
|
||
|
|
.card h1 {
|
||
|
|
color: #444;
|
||
|
|
}
|
||
|
|
.card h2 {
|
||
|
|
color: #777;
|
||
|
|
}
|
||
|
|
.card h3 {
|
||
|
|
color: #999;
|
||
|
|
}
|
||
|
|
.card a {
|
||
|
|
text-decoration: none;
|
||
|
|
display: block;
|
||
|
|
}
|
||
|
|
|
||
|
|
.card:hover {
|
||
|
|
animation: card-hover-anim 0.25s ease-out;
|
||
|
|
animation-fill-mode: forwards;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* .card:hover h3 { */
|
||
|
|
/* animation: card-text-hover-anim 0.25s ease-out; */
|
||
|
|
/* animation-fill-mode: forwards; */
|
||
|
|
/* } */
|
||
|
|
|
||
|
|
.card img {
|
||
|
|
vertical-align: bottom;
|
||
|
|
float: right;
|
||
|
|
padding: 0em 0.1em 0em 0.1em;
|
||
|
|
width: 60px;
|
||
|
|
}
|
||
|
|
.card svg {
|
||
|
|
vertical-align: bottom;
|
||
|
|
float: right;
|
||
|
|
padding: 0em 0.1em 0em 0.1em;
|
||
|
|
width: 3em;
|
||
|
|
height: auto;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
.content-subhead {
|
||
|
|
margin: 50px 0 20px 0;
|
||
|
|
font-weight: 300;
|
||
|
|
color: #444;
|
||
|
|
}
|
||
|
|
|
||
|
|
code {
|
||
|
|
font-family: Cascadia;
|
||
|
|
}
|
||
|
|
|
||
|
|
.code-block {
|
||
|
|
/* background-color: #fdf6e3; */
|
||
|
|
background-color: #eee;
|
||
|
|
color: #002b36;
|
||
|
|
font-family: Cascadia;
|
||
|
|
font-size: 0.85em;
|
||
|
|
padding: 0em 0.5em 0em 0.5em;
|
||
|
|
margin: 1em 0em 1em 0em;
|
||
|
|
page-break-inside: avoid;
|
||
|
|
display: block;
|
||
|
|
overflow: auto;
|
||
|
|
word-wrap: break-word;
|
||
|
|
max-width: 100%;
|
||
|
|
}
|
||
|
|
.code-block pre {
|
||
|
|
display: block;
|
||
|
|
margin: 0 0 0 0;
|
||
|
|
padding: 0 0 0 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
.code-block pre code {
|
||
|
|
font-family: Cascadia;
|
||
|
|
display: block;
|
||
|
|
white-space: pre-wrap;
|
||
|
|
}
|
||
|
|
.code-block span {
|
||
|
|
/* background-color: #fdf6e3; */
|
||
|
|
background-color: #eee;
|
||
|
|
}
|
||
|
|
.keyword {
|
||
|
|
color: #6c71c4;
|
||
|
|
}
|
||
|
|
.constant {
|
||
|
|
color: #cb4b16;
|
||
|
|
}
|
||
|
|
.function {
|
||
|
|
color: #268bd2;
|
||
|
|
}
|
||
|
|
.operator {
|
||
|
|
color: #6c71c4;
|
||
|
|
}
|
||
|
|
.punctuation {
|
||
|
|
color: #586e75;
|
||
|
|
}
|
||
|
|
.string {
|
||
|
|
color: #859900;
|
||
|
|
}
|
||
|
|
.type {
|
||
|
|
color: #2aa198;
|
||
|
|
}
|
||
|
|
.property {
|
||
|
|
color: #586e75;
|
||
|
|
}
|
||
|
|
</style></head><body><div class="pure-g"><div class="pure-u-1-1"><div class="header"><h1> Fishbowl <a target="_blank" href="https://github.com/Xterminate1818/fishbowl"><svg viewBox="0 0 128 128" style="width: 1em; padding-bottom: 0.2em;"><title> View source on GitHub </title><g fill="#181616"><path clip-rule="evenodd" d="M64 5.103c-33.347 0-60.388 27.035-60.388 60.388 0 26.682 17.303 49.317 41.297 57.303 3.017.56 4.125-1.31 4.125-2.905 0-1.44-.056-6.197-.082-11.243-16.8 3.653-20.345-7.125-20.345-7.125-2.747-6.98-6.705-8.836-6.705-8.836-5.48-3.748.413-3.67.413-3.67 6.063.425 9.257 6.223 9.257 6.223 5.386 9.23 14.127 6.562 17.573 5.02.542-3.903 2.107-6.568 3.834-8.076-13.413-1.525-27.514-6.704-27.514-29.843 0-6.593 2.36-11.98 6.223-16.21-.628-1.52-2.695-7.662.584-15.98 0 0 5.07-1.623 16.61 6.19C53.7 35 58.867 34.327 64 34.304c5.13.023 10.3.694 15.127 2.033 11.526-7.813 16.59-6.19 16.59-6.19 3.287 8.317 1.22 14.46.593 15.98 3.872 4.23 6.215 9.617 6.215 16.21 0 23.194-14.127 28.3-27.574 29.796 2.167 1.874 4.097 5.55 4.097 11.183 0 8.08-.07 14.583-.07 16.572 0 1.607 1.088 3.49 4.148 2.897 23.98-7.994 41.263-30.622 41.263-57.294C124.388 32.14 97.35 5.104 64 5.104z" fill-rule="evenodd"></path><path d="M26.484 91.806c-.133.3-.605.39-1.035.185-.44-.196-.685-.605-.543-.906.13-.31.603-.395 1.04-.188.44.197.69.61.537.91zm2.446 2.729c-.287.267-.85.143-1.232-.28-.396-.42-.47-.983-.177-1.254.298-.266.844-.14 1.24.28.394.426.472.984.17 1.255zM31.312 98.012c-.37.258-.976.017-1.35-.52-.37-.538-.37-1.183.01-1.44.373-.258.97-.025 1.35.507.368.545.368 1.19-.01 1.452zm3.261 3.361c-.33.365-1.036.267-1.552-.23-.527-.487-.674-1.18-.343-1.544.336-.366 1.045-.264 1.564.23.527.486.686 1.18.333 1.543zm4.5 1.951c-.147.473-.825.688-1.51.486-.683-.207-1.13-.76-.99-1.238.14-.477.823-.7 1.512-.485.683.206 1.13.756.988 1.237zm4.943.361c.017.498-.563.91-1.28.92-.723.017-1.308-.387-1.315-.877 0-.503.568-.91 1.29-.924.717-.013 1.306.387 1.306.88zm4.598-.782c.086.485-.413.984-1.126 1.117-.7.13-1.35-.172-1.44-.653-.086-.498.422-.997 1.122-1.126.714-.123 1.354.17 1.444.663zm0 0"></path></g></svg></a></h1><h2> Vector Math - Standard Library </h2></div><div class="content"><h2 class="distinct"> Gallery </h2><div class="pure-g"><div class="pure-u-1-3"><img title="Mona Lisa - Leonardo da Vinci" src="/resources/mona_lisa.gif" class="pure-img"/></div><div class="pure-u-1-3"><img class="pure-img" src="/resources/wanderer.gif" title="Wanderer above the Sea of Fog - Caspar David Friederich"/></div><div class="pure-u-1-3"><img src="/resources/starry_night.gif" title="The Starry Night - Vincent van Gogh" class="pure-img"/></div></div><h2 class="distinct"> Motivation </h2>
|
||
|
|
Physics solvers tend to be very complex software. In the
|
||
|
|
past, I toyed around with physics solvers for different kinds of geometries, but
|
||
|
|
struggled to implement these algorithms in a way that was both convincing
|
||
|
|
and performant. The idea for Fishbowl came from a video by the creator
|
||
|
|
Pezzza. They describe the high-level implementation details of a Verlet
|
||
|
|
Integration solver. This approach caught my interest.
|
||
|
|
<div class="video"><iframe title="YouTube video player" src="https://www.youtube-nocookie.com/embed/lS_qeBy3aQI?si=gLrHCWO-XUSP0T0j" frameborder="0" allowfullscreen allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin"></iframe></div>
|
||
|
|
Pezza's work is very impressive, particularly the demonstration at the end
|
||
|
|
which proves the program is deterministic. However, the focus of Pezzza's
|
||
|
|
project was to create a performant real-time application. I was instead
|
||
|
|
interested in pre-rendered images and animations. I decided to expand the
|
||
|
|
one-off demonstration at the end of Pezzza's video into a fully fledged
|
||
|
|
app.
|
||
|
|
<h2 class="distinct"> Approach </h2>
|
||
|
|
At the center of any physics solver is the physics 'step', a fixed interval of
|
||
|
|
time where objects move and collide. The physics step of Fishbowl consists of five
|
||
|
|
distinct phases.
|
||
|
|
<div class="code-block">
|
||
|
|
<pre><code>
|
||
|
|
<span class="comment">// Keep all objects inside the simulation bounds</span>
|
||
|
|
<span class="variable builtin">self</span><span class="punctuation delimiter">.</span><span class="function">constrain_rect</span><span class="punctuation bracket">(</span><span class="punctuation bracket">)</span><span class="punctuation delimiter">;</span>
|
||
|
|
<span class="comment">// Sort objects from left-most to right-most.</span>
|
||
|
|
<span class="variable builtin">self</span><span class="punctuation delimiter">.</span><span class="function">sort</span><span class="punctuation bracket">(</span><span class="punctuation bracket">)</span><span class="punctuation delimiter">;</span>
|
||
|
|
<span class="comment">// Apply collision impulses</span>
|
||
|
|
<span class="variable builtin">self</span><span class="punctuation delimiter">.</span><span class="function">collide</span><span class="punctuation bracket">(</span><span class="punctuation bracket">)</span><span class="punctuation delimiter">;</span>
|
||
|
|
<span class="comment">// Calculate new velocities and accelerations</span>
|
||
|
|
<span class="variable builtin">self</span><span class="punctuation delimiter">.</span><span class="function">integrate</span><span class="punctuation bracket">(</span><span class="punctuation bracket">)</span><span class="punctuation delimiter">;</span>
|
||
|
|
<span class="comment">// Finally, advance the simulation clock</span>
|
||
|
|
<span class="variable builtin">self</span><span class="punctuation delimiter">.</span><span class="variable other member">clock</span> <span class="operator">+=</span> <span class="constant numeric integer">1</span><span class="punctuation delimiter">;</span>
|
||
|
|
|
||
|
|
</code></pre>
|
||
|
|
</div>
|
||
|
|
Because the program doesn't run in real time, simulating over one second
|
||
|
|
may take more or less than a second. Calculating a larger number of shorter
|
||
|
|
time steps will make the simulation more accurate, but will take longer to
|
||
|
|
process. Fishbowl uses an number of optimizations to reduce processing time.
|
||
|
|
By keeping the array of objects sorted from left to right, the number of collision
|
||
|
|
checks is significantly reduced. The rendering system is decoupled from the simulation,
|
||
|
|
and the two are pipelined together and run in parallel.
|
||
|
|
<h2 class="distinct"> Rendering </h2>
|
||
|
|
The method I used for drawing circles to a frame went through numerous iterations.
|
||
|
|
Rendering performance is a major bottleneck, and so it was important to do so in
|
||
|
|
parallel. After writing and benchmarking several software renderers, I landed on
|
||
|
|
WebGPU. While quite bloated, WebGPU provides a fast, low level, and cross platform
|
||
|
|
rendering API designed for async programs. This allows Fishbowl to easily integrate
|
||
|
|
with both my server, which is entirely async, and the simulation, which is mostly
|
||
|
|
synchronous. While I would have liked to use a bespoke solution, GPU accelerated
|
||
|
|
rendering is far too quick to realistically consider any other option.
|
||
|
|
<h2 class="distinct"> Try It Out </h2>
|
||
|
|
You can try out Fishbowl below, or download the CLI tool from my GitHub.
|
||
|
|
It works best on images that are roughly square and don't contain any text.
|
||
|
|
Keep in mind the web version below will be slower and generate lower quality
|
||
|
|
results than the native application, as it is being run on my home server with
|
||
|
|
limited resources.
|
||
|
|
<br/><br/><img class="pure-img centered" width="512" height="512" id="result_image" hidden/><form class="pure-form-stacked" style="justify-content: center;" enctype="multipart/form-data" method="post" id="fishForm"><fieldset><label for="file"> Select an image </label><input accept="image/bmp,image/gif,image/vnd.microsoft.icon,image/jpeg,image/png,image/tiff,image/webp" id="file" type="file" name="image" required/><br/><input type="submit" class="pure-button pure-button-primary" value="Run Fishbowl"/></fieldset></form><!----><script>
|
||
|
|
|
||
|
|
const form = document.getElementById("fishForm");
|
||
|
|
const image = document.getElementById("result_image");
|
||
|
|
form.onsubmit = async (ev) => {
|
||
|
|
ev.preventDefault();
|
||
|
|
image.src = "";
|
||
|
|
image.hidden = false;
|
||
|
|
image.classList.add("loading");
|
||
|
|
const form = ev.currentTarget;
|
||
|
|
const action = form.action;
|
||
|
|
try {
|
||
|
|
const form_data = new FormData(form);
|
||
|
|
const response = await fetch(action, {
|
||
|
|
method: 'POST',
|
||
|
|
body: form_data,
|
||
|
|
});
|
||
|
|
const blob = await response.blob();
|
||
|
|
image.src = URL.createObjectURL(blob);
|
||
|
|
image.classList.remove("loading");
|
||
|
|
} catch (error) {
|
||
|
|
console.log(error);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
</script></div></div></div></body></html>
|