freds72 [Lexaloffle Blog Feed]https://www.lexaloffle.com/bbs/?uid=25532 tline incorrect clipping <p>introduced in 0.2.0d<br /> how to reproduce:</p> <ul> <li>call tline with a start point outside of screen boundaries</li> <li>tline starts at 0 without adjusting lookup coordinates</li> </ul> <p>repro cart:<br /> <table><tr><td> <a href="/bbs/?pid=75284#p"> <img src="/bbs/thumbs/pico8_kuwirapima-0.png" style="height:256px"></a> </td><td width=10></td><td valign=top> <a href="/bbs/?pid=75284#p"> kuwirapima</a><br><br> by <a href="/bbs/?uid=25532"> freds72</a> <br><br><br> <a href="/bbs/?pid=75284#p"> [Click to Play]</a> </td></tr></table> </p> https://www.lexaloffle.com/bbs/?tid=37561 https://www.lexaloffle.com/bbs/?tid=37561 Fri, 24 Apr 2020 12:30:10 UTC Unable to draw after mouse pan <p>How to reproduce:</p> <ul> <li>switch to spritesheet</li> <li>select pen tool</li> <li>draw</li> <li>middle-mouse click to pan</li> <li>draw does nothing outside the initial zone</li> </ul> <img style="" border=0 src="/media/25532/assault_1.gif" alt="" /> https://www.lexaloffle.com/bbs/?tid=37409 https://www.lexaloffle.com/bbs/?tid=37409 Fri, 17 Apr 2020 15:52:20 UTC nil not handled as zero in bit operators <p>How to reproduce:</p> <div> <div style="max-width:800px; overflow:auto; margin-bottom:12px"> <table style="width:100%" cellspacing=0 cellpadding=0> <tr><td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> <td background=/gfx/code_bg0.png> <div style="font-family : courier; color: #000000; display:absolute; padding-left:10px; padding-top:4px; padding-bottom:4px; "> <pre> -- outputs zero local b=band(nil,4) -- throws error (arithmetic on field ?) local b=nil&lt;&lt;4 </pre></div></td> <td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> </tr></table></div></div> https://www.lexaloffle.com/bbs/?tid=37405 https://www.lexaloffle.com/bbs/?tid=37405 Fri, 17 Apr 2020 07:07:52 UTC info + #include reports random figures <p>How to reproduce:</p> <ul> <li>cart with 3 includes</li> </ul> <div> <div style="max-width:800px; overflow:auto; margin-bottom:12px"> <table style="width:100%" cellspacing=0 cellpadding=0> <tr><td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> <td background=/gfx/code_bg0.png> <div style="font-family : courier; color: #000000; display:absolute; padding-left:10px; padding-top:4px; padding-bottom:4px; "> <pre> #include includes/bold.lua #include includes/bigscore.lua ... some other code ... #include includes/tquad.lua </pre></div></td> <td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> </tr></table></div></div> <ul> <li>reports invalid 'printb' not found (included in bold.lua)</li> <li>info produces random output:</li> </ul> <img style="" border=0 src="/media/25532/assault_001.png" alt="" /> <ul> <li>ctrl-r clears the error and runs the cart ok</li> </ul> https://www.lexaloffle.com/bbs/?tid=37404 https://www.lexaloffle.com/bbs/?tid=37404 Fri, 17 Apr 2020 07:00:23 UTC bit operators without assignment bogus syntax error message <p>how to reproduce: </p> <div> <div style="max-width:800px; overflow:auto; margin-bottom:12px"> <table style="width:100%" cellspacing=0 cellpadding=0> <tr><td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> <td background=/gfx/code_bg0.png> <div style="font-family : courier; color: #000000; display:absolute; padding-left:10px; padding-top:4px; padding-bottom:4px; "> <pre> for i=1,n do i&lt;&lt;5 end </pre></div></td> <td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> </tr></table></div></div> <p>Output:</p> <img style="" border=0 src="/media/25532/null_syntax_error.PNG" alt="" /> <p>or</p> <img style="" border=0 src="/media/25532/japanese_syntax_error.PNG" alt="" /> <p>Repro cart:<br /> <table><tr><td> <a href="/bbs/?pid=74867#p"> <img src="/bbs/thumbs/pico8_towakowibo-0.png" style="height:256px"></a> </td><td width=10></td><td valign=top> <a href="/bbs/?pid=74867#p"> towakowibo</a><br><br> by <a href="/bbs/?uid=25532"> freds72</a> <br><br><br> <a href="/bbs/?pid=74867#p"> [Click to Play]</a> </td></tr></table> </p> https://www.lexaloffle.com/bbs/?tid=37403 https://www.lexaloffle.com/bbs/?tid=37403 Fri, 17 Apr 2020 06:36:36 UTC [request] Multicart on BBS <p>Multicart is really a nice expansion feature, to offer content beyond the 32K boundary.<br /> However, with reload not supporting BBS-hosted carts, large games are banned from BBS.</p> <p>Is that something considered in the pico roadmap to bring back multicart games to the &quot;official&quot; forums?</p> <p>Note that supporting more than a couple of data carts will require rework of the BBS file management.</p> <ul> <li>support for upload many files at once</li> <li>support for listing cart identifiers</li> <li>support for headless export of p8.png (limited to html/bin at time of writing)</li> <li>ability to assign same id pattern to many carts (ex: vracing_0... vracing_10)</li> </ul> <p>Cheers</p> https://www.lexaloffle.com/bbs/?tid=36991 https://www.lexaloffle.com/bbs/?tid=36991 Wed, 04 Mar 2020 19:53:52 UTC reload bug <p>As per documentation, reload does not support BBS carts.<br /> However, the function fails without any error while trying:</p> <div> <div style="max-width:800px; overflow:auto; margin-bottom:12px"> <table style="width:100%" cellspacing=0 cellpadding=0> <tr><td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> <td background=/gfx/code_bg0.png> <div style="font-family : courier; color: #000000; display:absolute; padding-left:10px; padding-top:4px; padding-bottom:4px; "> <pre> -- does nothing (or not??) reload(0,0,0x4300,&quot;#vracing_5&quot;) </pre></div></td> <td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> </tr></table></div></div> <p>Could the function reports an error in such case?</p> https://www.lexaloffle.com/bbs/?tid=36962 https://www.lexaloffle.com/bbs/?tid=36962 Sun, 01 Mar 2020 21:42:32 UTC Code panel freezes browser <p>On Chrome: Version 79.0.3945.88 (64 bits)<br /> How to reproduce:</p> <ul> <li>navigate to any game</li> <li>click on &quot;code&quot; dropdown</li> <li>page becomes unresponsive (cannot be selected, game cannot be launched...)</li> </ul> <p>Not reproduced on Edge (and apparently on Firefox - cannot test)</p> https://www.lexaloffle.com/bbs/?tid=36463 https://www.lexaloffle.com/bbs/?tid=36463 Thu, 02 Jan 2020 21:05:19 UTC snow! <p> <table><tr><td> <a href="/bbs/?pid=70497#p"> <img src="/bbs/thumbs/pico8_freds72_snow-3.png" style="height:256px"></a> </td><td width=10></td><td valign=top> <a href="/bbs/?pid=70497#p"> freds72_snow</a><br><br> by <a href="/bbs/?uid=25532"> freds72</a> <br><br><br> <a href="/bbs/?pid=70497#p"> [Click to Play]</a> </td></tr></table> </p> <p>Winter is coming (as every year actually...), time for some skiing!<br /> Enjoy going down the slope, trying to beat your previous track record or freeriding skills!</p> <p>Grab coins for some extra time bonus - watch out for off track hazards!<br /> Your polar jacket can sustain a couple of direct hits, avoid trees anyway...</p> <p>Note: there is no end racing line - you <strong>will</strong> loose :] question is how much time will you last?</p> <img style="" border=0 src="https://www.lexaloffle.com/bbs/files/25532/snow_intro.gif" alt="" /> <p><img style="" border=0 src="https://www.lexaloffle.com/bbs/files/25532/snow_gameplay1.gif" alt="" /> <img style="" border=0 src="https://www.lexaloffle.com/bbs/files/25532/snow_gameplay2.gif" alt="" /></p> <h2>Controls</h2> <ul> <li>Left/Right: control direction</li> <li>c: jump (hold to charge)</li> <li>x: restart (if stuck)</li> <li>follow GPS pointer if lost</li> </ul> <h2>Tracks</h2> <ul> <li>blue: easy</li> <li>red: moderate, with side tracks. Practice your tricks.</li> <li>black: heavy slope, with side tracks. Tricks or time out :)</li> </ul> <h1>About the PICO-8 Advent Calendar</h1> <p>This winter another group of PICO-8 elves has worked hard to release a shiny new toy every day in December. Check out the <a href="https://www.lexaloffle.com/bbs/?tid=36076">Pico-8 Advent Calendar 2019</a> each day for a new surprise! </p> <p>There's even more festive fun waiting on last year's calendar! <a href="https://www.lexaloffle.com/bbs/?tid=32388">https://www.lexaloffle.com/bbs/?tid=32388</a></p> <p>Happy Holidays!</p> <h1>Devlog</h1> <p>Before I joined the ranks of the Advent Calendar 2019, <a href="https://www.lexaloffle.com/bbs/?uid=15227"> @johanp</a>, <a href="https://www.lexaloffle.com/bbs/?uid=28958"> <a href="https://www.lexaloffle.com/bbs/?uid=28958"> @p01</a></a> and others were toying with terrain generation - resulting in this:</p> <img style="" border=0 src="https://www.lexaloffle.com/bbs/files/25532/wipeout_0.gif" alt="" /> <p>With the theme being set to winter, I had this prototype ready to test the idea:</p> <img style="" border=0 src="https://www.lexaloffle.com/bbs/files/25532/st8p_1.gif" alt="" /> <p>The gameplay evolved from some endless runner to something more akin a time attack game.<br /> Thanks to feedback from early testers, and several gameplay changes, I think I have something that is fun to play and challenging enough!</p> <p>Source code (+unminified version): <a href="https://github.com/freds72/midwinter">https://github.com/freds72/midwinter</a></p> <h2>Update 1.3</h2> <ul> <li>updated: high level gameplay :]</li> <li>know bug: minor visual artifacts on black track (due to the way I cull terrain)</li> </ul> <h1>Credits</h1> <ul> <li>Advent Calendar folks! (<a href="https://www.lexaloffle.com/bbs/?uid=16975"> @enargy</a> :)</li> <li>Midwinter mask: Andrew Elkerton (I guess...)</li> <li>intro music: @gruber_music</li> <li>trifill: <a href="https://www.lexaloffle.com/bbs/?uid=28958"> <a href="https://www.lexaloffle.com/bbs/?uid=28958"> @p01</a></a></li> </ul> https://www.lexaloffle.com/bbs/?tid=36092 https://www.lexaloffle.com/bbs/?tid=36092 Mon, 02 Dec 2019 19:39:05 UTC Rotated Ellipse Fill <p> <table><tr><td> <a href="/bbs/?pid=66809#p"> <img src="/bbs/thumbs/pico8_ellipsefill-0.png" style="height:256px"></a> </td><td width=10></td><td valign=top> <a href="/bbs/?pid=66809#p"> ellipsefill</a><br><br> by <a href="/bbs/?uid=25532"> freds72</a> <br><br><br> <a href="/bbs/?pid=66809#p"> [Click to Play]</a> </td></tr></table> </p> <p>A little experiment with filled ellipse, supporting any rotation angle (the tricky part!).<br /> The code is moderately fast as it finds the root of the ellipse equation to get the segment extent for each row.</p> <p>Car headlight example use:</p> <img style="" border=0 src="https://www.lexaloffle.com/bbs/files/25532/ellipse_0.gif" alt="" /> https://www.lexaloffle.com/bbs/?tid=35124 https://www.lexaloffle.com/bbs/?tid=35124 Tue, 20 Aug 2019 20:47:24 UTC [feature] fast loading for multi-cart <p><a href="https://www.lexaloffle.com/bbs/?uid=1"> @zep</a><br /> A couple of devs are investing into multicart games (like 5 or more data carts).<br /> We are all put back by the artificial loading times (eg <em>minutes</em>)</p> <p>Would it be possible for the fat client to either ignore load time throttling, or only activat throttling for the published version?<br /> I want the multicart multiverse, not loading screens ;)</p> https://www.lexaloffle.com/bbs/?tid=34813 https://www.lexaloffle.com/bbs/?tid=34813 Tue, 23 Jul 2019 06:44:48 UTC stat(102) does not work for iframes <p>Using the <em>cough</em> undocumented <em>cough</em> stat(102) from a game hosted on itch.io, I got back:</p> <div> <div style="max-width:800px; overflow:auto; margin-bottom:12px"> <table style="width:100%" cellspacing=0 cellpadding=0> <tr><td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> <td background=/gfx/code_bg0.png> <div style="font-family : courier; color: #000000; display:absolute; padding-left:10px; padding-top:4px; padding-bottom:4px; "> <pre> v6p9d9t4.ssl.hwcdn.net </pre></div></td> <td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> </tr></table></div></div> <p>This is indeed the url of the iframe (which doesn't help).<br /> A more correct behavior would be to report the parent page url, with the benefits of:</p> <ul> <li>having a predictable outcome</li> <li>actually preventing rogue hosting (somehow...)</li> </ul> <p>Note: Looking at the HTML, I see that url is retrieved from:</p> <div> <div style="max-width:800px; overflow:auto; margin-bottom:12px"> <table style="width:100%" cellspacing=0 cellpadding=0> <tr><td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> <td background=/gfx/code_bg0.png> <div style="font-family : courier; color: #000000; display:absolute; padding-left:10px; padding-top:4px; padding-bottom:4px; "> <pre> var str = window.location.hostname; </pre></div></td> <td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> </tr></table></div></div> <p>Using that alternate code would fix the bug:</p> <div> <div style="max-width:800px; overflow:auto; margin-bottom:12px"> <table style="width:100%" cellspacing=0 cellpadding=0> <tr><td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> <td background=/gfx/code_bg0.png> <div style="font-family : courier; color: #000000; display:absolute; padding-left:10px; padding-top:4px; padding-bottom:4px; "> <pre> var str = (parent !== window) ? document.referrer : document.location; </pre></div></td> <td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> </tr></table></div></div> https://www.lexaloffle.com/bbs/?tid=34800 https://www.lexaloffle.com/bbs/?tid=34800 Sun, 21 Jul 2019 08:37:57 UTC Licences PICO-8 &agrave; gagner! <p><em>Ce post est la version fran&ccedil;aise de:</em> <a href="https://www.lexaloffle.com/bbs/?tid=34615">PICO-8 Giveaway</a></p> <p>Initi&eacute; par <a href="https://www.lexaloffle.com/bbs/?uid=13822"> @Liquidream</a>, plusieurs developpeurs offrent des licences pico8 &agrave; des jeunes (et moins jeunes) qui n'auraient pas les moyens mais pleins d'id&eacute;es!</p> <h1>Participation</h1> <p>Pour avoir une chance de gagner, repondez &agrave; la <a href="https://www.lexaloffle.com/bbs/?tid=34615">discussion officielle</a> avec un petit message:</p> <ul> <li>pourquoi vous voulez une licence?</li> <li>quel jeu(x) comptez-vous cr&eacute;er?</li> </ul> <h1>Les R&egrave;gles</h1> <ul> <li>Ouvert &agrave; tous (sauf ceux qui peuvent se payer une licence ET un sandwich!)</li> <li>Une seule entr&eacute;e par personne</li> <li>Date de cloture (ouch!) Samedi 6 Juillet @ 11:00 (heure Paris)</li> <li>Les gagnants seront choisis <em>au hasard</em> </li> <li>Il y aura autant de gagnants que de licences offertes</li> <li>La licence sera attribu&eacute;es via un compte mail (message priv&eacute;)</li> </ul> <p>Bonne chance 😁🤞</p> https://www.lexaloffle.com/bbs/?tid=34630 https://www.lexaloffle.com/bbs/?tid=34630 Thu, 04 Jul 2019 19:16:58 UTC Ghost Rally <h1>Ghost Rally</h1> <p> <table><tr><td> <a href="/bbs/?pid=64950#p"> <img src="/bbs/thumbs/pico8_grally-0.png" style="height:256px"></a> </td><td width=10></td><td valign=top> <a href="/bbs/?pid=64950#p"> grally</a><br><br> by <a href="/bbs/?uid=25532"> freds72</a> <br><br><br> <a href="/bbs/?pid=64950#p"> [Click to Play]</a> </td></tr></table> </p> <h2>Game</h2> <p>The game is a race-against-yourself rally game. It features accurate rigid body physics and car handling.<br /> Goal is to beat yourself every lap!</p> <p>Enjoy racing as in the 80's, whith over powered cars very close to the public!<br /> <em>tip</em> hitting any of the lil' dudes: <table><tr><td width=244> <img src="https://www.lexaloffle.com/bbs/gfxc/25532_4.png" width=244 height=64> </td> <td valign=bottom> <a style="cursor:pointer;font-size:8pt" onclick=' var el = document.getElementById("gfxcode_25532_4"); if (el.style.display == "none") el.style.display = ""; else el.style.display = "none"; microAjax("https://www.lexaloffle.com/bbs/gfxc/25532_4.txt", function (retdata){ var el = document.getElementById("gfxcode_25532_4"); el.innerHTML = retdata; el.focus(); el.select(); } ); '> [61x16]</a> </td></tr> <tr><td colspan=2> <textarea rows=3 class=lexinput id="gfxcode_25532_4" style="width:640px;background-color:#fed;display:none;overflow:hidden; font-size:6pt;"></textarea> </td> </tr> </table> incurs a +5s time penalty :]</p> <p><em>warning</em> the game is complete yet the car handling is <strong>really</strong> picky - I am releasing it as is, as I can't tweak the gameplay without breaking the physic engine :/</p> <h2>Controls</h2> <ul> <li>left/right: turn</li> <li>up/down: accelerate/brake</li> <li>c: re<strong>c</strong>over (when flipping over!)</li> </ul> <h1>Dev Log</h1> <p>Source code &amp; tools: <a href="https://github.com/freds72/ghost-rally">ghost-rally</a></p> <h2>Credits:</h2> <p>Sound effect code: taken from <a href="https://www.lexaloffle.com/bbs/?uid=10050"> @tiagosr</a> rally game<br /> Trifill: <a href="https://www.lexaloffle.com/bbs/?uid=28958"> <a href="https://www.lexaloffle.com/bbs/?uid=28958"> @p01</a></a></p> <h2>Physic Engine</h2> <p>Physic engine was started from scratch following <a href="http://www.cs.cmu.edu/~baraff/sigcourse/notesd1.pdf">Barraf's</a> 'classic' paper.<br /> I quickly dropped this version as it relied too much on numeric convergence !</p> <p>The current version uses part of <a href="https://github.com/RandyGaul/qu3e">Randy Gaul C++ physic library</a> and <a href="https://www.randygaul.net/2013/03/27/game-physics-engine-part-1-impulse-resolution">underlying principles</a>.<br /> The key aspect to get stable collision is to resolve impacts only for the incident face, e.g. the plane most facing the ground:</p> <img style="" border=0 src="https://www.lexaloffle.com/bbs/files/25532/rally_9.gif" alt="" /> <p>This is obviously an heavily simplified version, limited to dynamic-to-static resolution.<br /> Randy's engine architecture relies on very few magic constants and is extremely stable (well, as long as pico numbers don't get in the way!!).</p> <p>The physic engine is designed as an extension a generic 3d actor class and can easily be taken out for other games.</p> <h2>Car Physic</h2> <p>The car is modeled using a front and rear tire. Each tire has lateral and longitudinal forces, as detailed in this article: <a href="http://theracingline.net/2018/race-car-tech/race-tech-explained/tyres-combined-tyre-forces/">The Racing Line - Combined Tyre Forces</a>.<br /> Other good readings:<br /> <a href="http://www.asawicki.info/Mirror/Car%20Physics%20for%20Games/Car%20Physics%20for%20Games.html">Car Physics for Games</a><br /> <a href="https://www.iforce2d.net/b2dtut/top-down-car">Box2d Top Down Racing Game</a></p> <p>The gif above shows forces applied to the car and their application point:</p> <ul> <li>G force (down)</li> <li>read tyre pushing car (with a lateral component to counter slide)</li> <li>front tyre and turning forces (again with a lateral component)</li> </ul> <p>Slip angle and slip ratio curves are defined using SFX 4 and 5 - tweak them to see effect in game!</p> <img style="" border=0 src="https://www.lexaloffle.com/bbs/files/25532/rally_001.png" alt="" /> <h2>Terrain</h2> <p>The game started as a terrain renderer using marching squares.<br /> Terrain height map is 64x64, displayed as a 128x128 grid to display marching square &quot;diamond tiles&quot;:</p> <img style="" border=0 src="https://www.lexaloffle.com/bbs/files/25532/rally_wireframe.gif" alt="" /> <h2>Textured Car</h2> <p>The car is textured mapped, using a custom version of <a href="https://www.lexaloffle.com/bbs/?uid=28958"> <a href="https://www.lexaloffle.com/bbs/?uid=28958"> @p01</a></a> trifill.<br /> The Blender model directly references an export of the cart spritesheet.</p> <h2>Toolchain</h2> <p>The game uses my usual Blender/Python export toolchain.<br /> A custom terrain editor is available as a pico-8 cart (contact me if needed)</p> https://www.lexaloffle.com/bbs/?tid=34424 https://www.lexaloffle.com/bbs/?tid=34424 Sun, 02 Jun 2019 14:33:39 UTC Help on __sfx__ section byte format <p>I am writing data to a p8 file from a Python program - format for 0x0-0x3200 ROM range is ok.<br /> Issue is sfx section - each sfx (68 bytes) is actually written as 84 bytes (??) with empty bits left and right.<br /> I have no clue what is the masking/bitshifting/... logic between my input value and the resulting p8 string.</p> <p>Example:</p> <div> <div style="max-width:800px; overflow:auto; margin-bottom:12px"> <table style="width:100%" cellspacing=0 cellpadding=0> <tr><td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> <td background=/gfx/code_bg0.png> <div style="font-family : courier; color: #000000; display:absolute; padding-left:10px; padding-top:4px; padding-bottom:4px; "> <pre> poke4(0x3200,0x1234.5678) cstore() </pre></div></td> <td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> </tr></table></div></div> <p>produces:</p> <div> <div style="max-width:800px; overflow:auto; margin-bottom:12px"> <table style="width:100%" cellspacing=0 cellpadding=0> <tr><td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> <td background=/gfx/code_bg0.png> <div style="font-family : courier; color: #000000; display:absolute; padding-left:10px; padding-top:4px; padding-bottom:4px; "> <pre> __sfx__ 000100003813534011000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 </pre></div></td> <td background=/gfx/code_bg1.png width=16><div style="width:16px;display:block"></div></td> </tr></table></div></div> <p>wtf??</p> https://www.lexaloffle.com/bbs/?tid=34167 https://www.lexaloffle.com/bbs/?tid=34167 Thu, 09 May 2019 18:44:42 UTC [v0.1.12c] key stuck in html export <p><strong><em> Case solved: issue was triggered by one of my USB sticks constantly sending inputs </em></strong></p> <p>When exporting <a href="https://github.com/freds72/tiny_sim/blob/1.1/carts/tinysim_v11.p8">Tiny Sim</a>, some keys are stuck:</p> <img style="" border=0 src="https://www.lexaloffle.com/bbs/files/25532/keyboard_stuck.PNG" alt="" /> https://www.lexaloffle.com/bbs/?tid=34130 https://www.lexaloffle.com/bbs/?tid=34130 Fri, 03 May 2019 14:25:18 UTC FPS Desert Demo <p> <table><tr><td> <a href="/bbs/?pid=63343#p"> <img src="/bbs/thumbs/pico8_numakunawa-0.png" style="height:256px"></a> </td><td width=10></td><td valign=top> <a href="/bbs/?pid=63343#p"> numakunawa</a><br><br> by <a href="/bbs/?uid=25532"> freds72</a> <br><br><br> <a href="/bbs/?pid=63343#p"> [Click to Play]</a> </td></tr></table> </p> <p>FPS demo cart as an answer to <a href="https://www.lexaloffle.com/bbs/?uid=10198"> @MBoffin</a> April 1st Twitter joke.<br /> Stay tuned for technical details.</p> https://www.lexaloffle.com/bbs/?tid=33827 https://www.lexaloffle.com/bbs/?tid=33827 Mon, 08 Apr 2019 21:27:53 UTC Realtime 3d shadows <p> <table><tr><td> <a href="/bbs/?pid=60772#p"> <img src="/bbs/thumbs/pico8_doyusuyepo-0.png" style="height:256px"></a> </td><td width=10></td><td valign=top> <a href="/bbs/?pid=60772#p"> doyusuyepo</a><br><br> by <a href="/bbs/?uid=25532"> freds72</a> <br><br><br> <a href="/bbs/?pid=60772#p"> [Click to Play]</a> </td></tr></table> </p> <p>Project started following a question on 3d clipping on this forum and quickly spiraled into a full blown 3d renderer with support for real-time shadows and camera space clipping :/</p> <p>Shadows are calculated in real-time by extruding a shadow volume from each lit face.<br /> Resulting polygons are added to the face and rendered/sorted with the face.</p> <p>The shadows are globals e.g. self-shadowing is supported, see torus scene.</p> <p>Performance-wise this is bordering what pico can support, as many clipping operations are required to generate shadow polygons. There is room for optimization (vertex cache, smart selection of clipping planes) left to the reader!</p> <h2>Sources</h2> <p>Project (including how to add custom 3d models) is available here: <a href="https://github.com/freds72/pico8-shadows">github</a></p> <h2>Acknowledgements:</h2> <ul> <li>3d papers from the 70s/80s are pure gold!</li> <li>trifill function from <a href="https://www.lexaloffle.com/bbs/?uid=28958"> @p01</a></li> </ul> <h2>Update 1.1</h2> <ul> <li>fixed polygon gaps (using correct middle screen position + ceil)</li> </ul> https://www.lexaloffle.com/bbs/?tid=32879 https://www.lexaloffle.com/bbs/?tid=32879 Sat, 12 Jan 2019 14:38:37 UTC Keyboard captured by game <p>How to reproduce:</p> <ul> <li>go to a game page</li> <li>launch game</li> <li>go to comment section</li> <li>type some text</li> </ul> <p>Bug: nothing appears (input is captured by pico)</p> <p>Workaround: refresh the page / don't launch game before posting comments.</p> https://www.lexaloffle.com/bbs/?tid=32536 https://www.lexaloffle.com/bbs/?tid=32536 Tue, 11 Dec 2018 21:38:30 UTC Unable to post/attach gifs <p>Since forum updates, new gif uploads are rendered as broken links.<br /> See: <a href="https://www.lexaloffle.com/bbs/?pid=59400#p">https://www.lexaloffle.com/bbs/?pid=59400#p</a></p> https://www.lexaloffle.com/bbs/?tid=32410 https://www.lexaloffle.com/bbs/?tid=32410 Sat, 01 Dec 2018 15:11:26 UTC