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<title>Sixth 3D engine demos</title>
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+<!-- 2018-06-24 Sun 02:37 -->
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<div class="row"><div class="col-md-9"><h1 class="title">Sixth 3D engine demos</h1>
-<hr >
+
+<div id="outline-container-sec-1" class="outline-2">
+<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
+<div class="outline-text-2" id="text-1">
<ul class="org-ul">
-<li>This is a subproject of <a href="http://www2.svjatoslav.eu/gitbrowse/sixth-3d/doc/index.html">Sixth 3D</a> which in turn is a subproject of
-<a href="http://www2.svjatoslav.eu/gitbrowse/sixth/doc/index.html">Sixth</a>.
-</li>
-<li><a href="http://www2.svjatoslav.eu/gitweb/?p=sixth-3d-demos.git;a=snapshot;h=HEAD;sf=tgz">download latest snapshot</a>
+<li>This is a subproject of <a href="http://www3.svjatoslav.eu/projects/sixth-3d/">Sixth 3D</a> which in turn is a subproject of
+<a href="http://www3.svjatoslav.eu/projects/sixth/">Sixth</a>.
</li>
-<li>This program is free software; you can redistribute it and/or modify it under
-the terms of version 3 of the <a href="https://www.gnu.org/licenses/lgpl.html">GNU Lesser General Public License</a> or later as
-published by the Free Software Foundation.
+<li>This program is free software: you can redistribute it and/or modify
+it under the terms of the <a href="https://www.gnu.org/licenses/lgpl.html">GNU Lesser General Public License</a> as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
</li>
<li>Program author:
</ul>
</li>
-<li><a href="http://www.svjatoslav.eu/programs.jsp">other applications hosted at svjatoslav.eu</a>
+<li><a href="http://www.svjatoslav.eu/projects/">Other software projects hosted at svjatoslav.eu</a>
</li>
</ul>
+</div>
+<div id="outline-container-sec-1-1" class="outline-3">
+<h3 id="sec-1-1"><span class="section-number-3">1.1</span> Source code</h3>
+<div class="outline-text-3" id="text-1-1">
+<ul class="org-ul">
+<li><a href="http://www2.svjatoslav.eu/gitweb/?p=sixth-3d-demos.git;a=snapshot;h=HEAD;sf=tgz">Download latest snapshot in TAR GZ format</a>
+</li>
-<div id="outline-container-sec-1" class="outline-2">
-<h2 id="sec-1"><span class="section-number-2">1</span> Description</h2>
-<div class="outline-text-2" id="text-1">
+<li><a href="http://www2.svjatoslav.eu/gitweb/?p=sixth-3d-demos.git;a=summary">Browse Git repository online</a>
+</li>
+
+<li>Clone Git repository using command:
+<pre class="example">
+git clone http://www2.svjatoslav.eu/git/sixth-3d-demos.git
+</pre>
+</li>
+</ul>
+</div>
+</div>
+</div>
+
+<div id="outline-container-sec-2" class="outline-2">
+<h2 id="sec-2"><span class="section-number-2">2</span> Overview</h2>
+<div class="outline-text-2" id="text-2">
<p>
-Goal of this project is to show off capabilities of <a href="http://www2.svjatoslav.eu/gitbrowse/sixth-3d/doc/index.html">Sixth 3D</a>
-engine. Also to show examples of its usage.
+Goal of this project is to show off capabilities and API usage of
+<a href="http://www3.svjatoslav.eu/projects/sixth-3d/">Sixth 3D</a> engine.
</p>
+<p>
+All sample scenes below are rendered at interactive framerates.
+</p>
+</div>
+</div>
+<div id="outline-container-sec-3" class="outline-2">
+<h2 id="sec-3"><span class="section-number-2">3</span> Navigating in space</h2>
+<div class="outline-text-2" id="text-3">
+<table class="table table-striped table-bordered table-hover table-condensed">
+
+
+<colgroup>
+<col class="left">
+
+<col class="left">
+</colgroup>
+<thead>
+<tr>
+<th scope="col" class="text-left">key</th>
+<th scope="col" class="text-left">result</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="text-left">cursor keys</td>
+<td class="text-left">move: left, right, forward, backward</td>
+</tr>
+
+<tr>
+<td class="text-left">mouse scroll wheel</td>
+<td class="text-left">move: up, down</td>
+</tr>
+
+<tr>
+<td class="text-left">dragging with mouse</td>
+<td class="text-left">look around</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+
+<div id="outline-container-sec-4" class="outline-2">
+<h2 id="sec-4"><span class="section-number-2">4</span> Samples</h2>
+<div class="outline-text-2" id="text-4">
+</div><div id="outline-container-sec-4-1" class="outline-3">
+<h3 id="sec-4-1"><span class="section-number-3">4.1</span> Raytracing through voxels</h3>
+<div class="outline-text-3" id="text-4-1">
<figure>
-<p><a href="screenshots/index.html"><img src="screenshots.png" class="img-responsive" alt="screenshots.png"></a>
+<p><img src="screenshots/raytracing fractal in voxel polygon hybrid scene.png" class="img-responsive" alt="raytracing fractal in voxel polygon hybrid scene.png">
</p>
</figure>
<p>
-Sample scenes rendered at interactive framerates by Sixth 3D engine.
+Test scene that is generated simultaneously using:
+</p>
+<ul class="org-ul">
+<li>conventional polygons
+<ul class="org-ul">
+<li>for realtime navigation, and
+</li>
+</ul>
+</li>
+<li>voxels
+<ul class="org-ul">
+<li>for on-demand raytracing
+</li>
+</ul>
+</li>
+</ul>
+
+<p>
+Instead of storing voxels in dumb [X * Y * Z] array, dynamically
+partitioned <a href="https://en.wikipedia.org/wiki/Octree">octree</a> is used to compress data. Press "r" key anywhere in
+the scene to raytrace current view through compressed voxel
+datastructure.
</p>
</div>
</div>
+
+<div id="outline-container-sec-4-2" class="outline-3">
+<h3 id="sec-4-2"><span class="section-number-3">4.2</span> Conway's Game of Life</h3>
+<div class="outline-text-3" id="text-4-2">
+<p>
+The Game of Life, also known simply as Life, is a cellular automaton
+devised by the British mathematician John Horton Conway in 1970.
+</p>
+
+<ul class="org-ul">
+<li><a href="https://en.wikipedia.org/wiki/Conway's_Game_of_Life">https://en.wikipedia.org/wiki/Conway's_Game_of_Life</a>
+<ul class="org-ul">
+<li>Game rules:
+<ul class="org-ul">
+<li>2 cell states: alive / dead
+</li>
+<li>Each cell sees 8 neighboring cells.
+</li>
+<li>If alive cell neighbors count is 2 or 3, then cell survives,
+otherwise it dies.
+</li>
+<li>Dead cell becomes alive if neighbors count is exactly 3.
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+
+
+<figure>
+<p><img src="screenshots/life.png" class="img-responsive" alt="life.png">
+</p>
+</figure>
+
+<p>
+Current application projects 2D game grid/matrix onto three
+dimensional space. Extra dimension (height) is used to visualize
+history (previous iterations) using glowing dots suspended in space.
+</p>
+
+<p>
+Usage:
+</p>
+<table class="table table-striped table-bordered table-hover table-condensed">
+
+
+<colgroup>
+<col class="left">
+
+<col class="left">
+</colgroup>
+<thead>
+<tr>
+<th scope="col" class="text-left">key</th>
+<th scope="col" class="text-left">result</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="text-left">mouse click on the cell (cell)</td>
+<td class="text-left">toggles cell state</td>
+</tr>
+
+<tr>
+<td class="text-left"><space></td>
+<td class="text-left">next iteration</td>
+</tr>
+
+<tr>
+<td class="text-left">ENTER</td>
+<td class="text-left">next iteeration with the history</td>
+</tr>
+
+<tr>
+<td class="text-left">"c"</td>
+<td class="text-left">clear the matrix</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+
+<div id="outline-container-sec-4-3" class="outline-3">
+<h3 id="sec-4-3"><span class="section-number-3">4.3</span> Text editors</h3>
+<div class="outline-text-3" id="text-4-3">
+
+<figure>
+<p><img src="screenshots/text editors.png" class="img-responsive" alt="text editors.png">
+</p>
+</figure>
+
+<p>
+Initial test for creating user interfaces in 3D and:
+</p>
+<ul class="org-ul">
+<li>window focus handling
+</li>
+<li>picking objecs using mouse
+</li>
+<li>redirecting keyboard input to focused window
+</li>
+</ul>
+
+
+<p>
+Window focus acts like a stack.
+</p>
+
+<p>
+When window is clicked with the mouse, previously focused window (if
+any) is pushed to the focus stack and new window receives focus. Red
+frame appears around the window to indicate this.
+</p>
+
+<p>
+When ESC key is pressed, window focus is returned to previous window
+(if any).
+</p>
+
+<p>
+When any window is focused, all keyboard input is redirected to that
+window, including cursor keys. To be able to navigate around the world
+again, window must be unfocused first using ESC key.
+</p>
+
+
+<ul class="org-ul">
+<li>TODO:
+<ul class="org-ul">
+<li>Improve focus handling:
+<ul class="org-ul">
+<li>Perhaps add shortcut to navigate world without exiting entire
+stack of focus.
+</li>
+<li>Possibility to retain and reuse recently focused elements.
+</li>
+<li>Store user location in the world and view direction with the
+focused window. So that when returning focus to far away object,
+user is redirected also to proper location in the world.
+</li>
+</ul>
+</li>
+<li>Possibility to store recently visited locations in the world and
+return to them.
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+<div id="outline-container-sec-4-4" class="outline-3">
+<h3 id="sec-4-4"><span class="section-number-3">4.4</span> Mathematical formulas</h3>
+<div class="outline-text-3" id="text-4-4">
+
+<figure>
+<p><img src="screenshots/mathematical formulas.png" class="img-responsive" alt="mathematical formulas.png">
+</p>
+</figure>
+
+<ul class="org-ul">
+<li>TODO: instead of projecting 2D visualizations onto 3D space,
+visualize some formula using all 3 dimensions avaliable.
+</li>
+</ul>
+</div>
+</div>
+<div id="outline-container-sec-4-5" class="outline-3">
+<h3 id="sec-4-5"><span class="section-number-3">4.5</span> Sinus heightmaps and sphere</h3>
+<div class="outline-text-3" id="text-4-5">
+
+<figure>
+<p><img src="screenshots/sinus heightmaps and sphere.png" class="img-responsive" alt="sinus heightmaps and sphere.png">
+</p>
+</figure>
+
+<p>
+Simple test scene. Easy to implement and looks nice.
+</p>
+</div>
+</div>
+</div>
</div><div class="col-md-3"><nav id="table-of-contents">
<div id="text-table-of-contents" class="bs-docs-sidebar">
<ul class="nav">
-<li><a href="#sec-1">1. Description</a></li>
+<li><a href="#sec-1">1. General</a>
+<ul class="nav">
+<li><a href="#sec-1-1">1.1. Source code</a></li>
+</ul>
+</li>
+<li><a href="#sec-2">2. Overview</a></li>
+<li><a href="#sec-3">3. Navigating in space</a></li>
+<li><a href="#sec-4">4. Samples</a>
+<ul class="nav">
+<li><a href="#sec-4-1">4.1. Raytracing through voxels</a></li>
+<li><a href="#sec-4-2">4.2. Conway's Game of Life</a></li>
+<li><a href="#sec-4-3">4.3. Text editors</a></li>
+<li><a href="#sec-4-4">4.4. Mathematical formulas</a></li>
+<li><a href="#sec-4-5">4.5. Sinus heightmaps and sphere</a></li>
+</ul>
+</li>
</ul>
</div>
</nav>
</div></div></div>
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<div><p class="author">Author: Svjatoslav Agejenko</p>
-<p class="date">Created: 2017-07-07 Fri 13:12</p>
+<p class="date">Created: 2018-06-24 Sun 02:37</p>
<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 25.1.1 (<a href="http://orgmode.org">Org-mode</a> 8.2.10)</p>
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