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<!DOCTYPE html>
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			<h1 id="firstHeading" class="firstHeading" lang="en">Alpha Map Format</h1>
									<div id="bodyContent" class="mw-body-content">
									<div id="siteSub">From wiki.vg</div>
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					Jump to:					<a href="Alpha_Map_Format.html#mw-head">navigation</a>, 					<a href="Alpha_Map_Format.html#p-search">search</a>
				</div>
				<div id="mw-content-text" lang="en" dir="ltr" class="mw-content-ltr"><p>Alpha worlds consist of several files, all held together in one folder under a very rigid directory structure.
</p>
<div id="toc" class="toc"><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="Alpha_Map_Format.html#Level"><span class="tocnumber">1</span> <span class="toctext">Level</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="Alpha_Map_Format.html#Chunks"><span class="tocnumber">2</span> <span class="toctext">Chunks</span></a>
<ul>
<li class="toclevel-2 tocsection-3"><a href="Alpha_Map_Format.html#The_Base-36_Algorithm"><span class="tocnumber">2.1</span> <span class="toctext">The Base-36 Algorithm</span></a></li>
</ul>
</li>
<li class="toclevel-1 tocsection-4"><a href="Alpha_Map_Format.html#Players"><span class="tocnumber">3</span> <span class="toctext">Players</span></a>
<ul>
<li class="toclevel-2 tocsection-5"><a href="Alpha_Map_Format.html#Beta_player_files"><span class="tocnumber">3.1</span> <span class="toctext">Beta player files</span></a></li>
<li class="toclevel-2 tocsection-6"><a href="Alpha_Map_Format.html#Other_formats"><span class="tocnumber">3.2</span> <span class="toctext">Other formats</span></a></li>
</ul>
</li>
<li class="toclevel-1 tocsection-7"><a href="Alpha_Map_Format.html#Map_Generation"><span class="tocnumber">4</span> <span class="toctext">Map Generation</span></a>
<ul>
<li class="toclevel-2 tocsection-8"><a href="Alpha_Map_Format.html#Noise"><span class="tocnumber">4.1</span> <span class="toctext">Noise</span></a></li>
</ul>
</li>
</ul>
</div>

<h1><span class="mw-headline" id="Level">Level</span></h1>
<p>The level is a file called "level.dat" in the root of the world.
</p>
<table class="wikitable">
<tr>
<th> Name </th>
<th> Type </th>
<th> Description
</th></tr>
<tr>
<td> Data </td>
<td> Compound </td>
<td> General level data
<table class="wikitable">
<tr>
<th> Name </th>
<th> Type </th>
<th> Description
</th></tr>
<tr>
<td> RandomSeed </td>
<td> Long </td>
<td> The seed of the world, which is used to generate new geometry.
</td></tr>
<tr>
<td> SpawnX </td>
<td> Int </td>
<td> The X coordinate of the default spawn point
</td></tr>
<tr>
<td> SpawnY </td>
<td> Int </td>
<td> The Y coordinate of the default spawn point
</td></tr>
<tr>
<td> SpawnZ </td>
<td> Int </td>
<td> The Z coordinate of the default spawn point
</td></tr></table>
</td></tr></table>
<p><br />
</p>
<h1><span class="mw-headline" id="Chunks">Chunks</span></h1>
<p>Chunks are stored in folders inside the world corresponding to their coordinates in base-36. The path is "&lt;base-36-x-63&gt;/&lt;base-36-z-63&gt;/c.&lt;base-36-x&gt;.&lt;base-36-z&gt;.dat", where &lt;base-36-x-63&gt; is the base-36 representation of the X coordinate of the chunk AND'd bitwise with 63.
</p><p>For example, if we have the chunk coordinate (39, -13), we end up with the path 13/1f/c.13.-d.dat
</p><p>The main world is stored in the root directory of the world. The Nether is stored in the "DIM-1" folder in the root and uses the same chunk folder system.
</p>
<h2><span class="mw-headline" id="The_Base-36_Algorithm">The Base-36 Algorithm</span></h2>
<p>To retrieve the base-36 representation of a number, use the digits "0123456789abcdefghijklmnopqrstuvwxyz", and prefix the result with a hyphen ("-") if the number is negative.
</p><p>Example code in Python, from <a href="https://wiki.vg/index.php?title=Beta&amp;action=edit&amp;redlink=1" class="new" title="Beta (page does not exist)">Beta</a>:
</p>
<pre>def base36(i):
    """
    Return the string representation of i in base 36, using lowercase letters.
    """
    letters = "0123456789abcdefghijklmnopqrstuvwxyz"
    if i &lt; 0:
        i = -i
        signed = True
    elif i == 0:
        return "0"
    else:
        signed = False
    s = ""
    while i:
        i, digit = divmod(i, 36)
        s = letters[digit] + s
    if signed:
        s = "-" + s
    return s
</pre>
<p>Example code in C#:
</p><p><br />
</p>
<div class="mw-highlight mw-content-ltr" dir="ltr"><pre><span class="k">public</span> <span class="k">static</span> <span class="kt">string</span> <span class="nf">Base36Encode</span><span class="p">(</span><span class="kt">long</span> <span class="n">input</span><span class="p">)</span>
<span class="p">{</span>
	<span class="k">if</span> <span class="p">(</span><span class="n">input</span> <span class="p">==</span> <span class="m">0</span><span class="p">){</span> <span class="k">return</span> <span class="s">&quot;0&quot;</span><span class="p">;</span> <span class="p">}</span>
	<span class="kt">string</span> <span class="n">chars</span> <span class="p">=</span> <span class="s">&quot;0123456789abcdefghijklmnopqrstuvwxyz&quot;</span><span class="p">;</span>
	<span class="kt">bool</span> <span class="n">negative</span> <span class="p">=</span> <span class="p">(</span><span class="n">input</span> <span class="p">&lt;</span> <span class="m">0</span><span class="p">);</span>

	<span class="n">StringBuilder</span> <span class="n">sb</span> <span class="p">=</span> <span class="k">new</span> <span class="n">StringBuilder</span><span class="p">();</span>

	<span class="k">if</span> <span class="p">(</span><span class="n">negative</span><span class="p">)</span> <span class="p">{</span>
		<span class="n">input</span> <span class="p">=</span> <span class="p">-</span><span class="n">input</span><span class="p">;</span>
		<span class="n">sb</span><span class="p">.</span><span class="n">Append</span><span class="p">(</span><span class="s">&quot;-&quot;</span><span class="p">);</span>
	<span class="p">}</span>
	<span class="k">while</span> <span class="p">(</span><span class="n">input</span> <span class="p">&gt;</span> <span class="m">0</span><span class="p">)</span> <span class="p">{</span>
		<span class="n">sb</span><span class="p">.</span><span class="n">Insert</span><span class="p">((</span><span class="n">negative</span> <span class="p">?</span> <span class="m">1</span> <span class="p">:</span> <span class="m">0</span><span class="p">),</span> <span class="n">chars</span><span class="p">[(</span><span class="kt">int</span><span class="p">)(</span><span class="n">input</span> <span class="p">%</span> <span class="m">36</span><span class="p">)]);</span>
		<span class="n">input</span> <span class="p">/=</span> <span class="m">36</span><span class="p">;</span>
	<span class="p">}</span>
	<span class="k">return</span> <span class="n">sb</span><span class="p">.</span><span class="n">ToString</span><span class="p">();</span>
<span class="p">}</span>
</pre></div>
<h1><span class="mw-headline" id="Players">Players</span></h1>
<p>Persistent data for players is stored in a folder called "players". Each player has a file called "&lt;username&gt;.dat".
</p><p><br />
</p>
<h2><span class="mw-headline" id="Beta_player_files">Beta player files</span></h2>
<p>Player files are <a href="NBT.html" title="NBT">NBT</a> encoded.
</p><p>The file starts with a nameless TAG_Compound which contains all other data.
</p>
<table class="wikitable">
<tr>
<th> Tag Name </th>
<th> Type </th>
<th> Description
</th></tr>
<tr>
<td> SleepTimer </td>
<td> TAG_Short </td>
<td>
</td></tr>
<tr>
<td> Motion </td>
<td> TAG_List(3 TAG_Double) </td>
<td>
</td></tr>
<tr>
<td> OnGround </td>
<td> TAG_Byte </td>
<td>
</td></tr>
<tr>
<td> HurtTime </td>
<td> TAG_Short </td>
<td>
</td></tr>
<tr>
<td> Health </td>
<td> TAG_Short </td>
<td>
</td></tr>
<tr>
<td> Dimension </td>
<td> TAG_Int </td>
<td>
</td></tr>
<tr>
<td> Air </td>
<td> TAG_Short </td>
<td>
</td></tr>
<tr>
<td> Inventory </td>
<td> TAG_List or TAG_Byte(when empty) </td>
<td> See Inventory table below
</td></tr>
<tr>
<td> Pos </td>
<td> TAG_List(3 TAG_Double) </td>
<td>
</td></tr>
<tr>
<td> AttackTime </td>
<td> TAG_Short </td>
<td>
</td></tr>
<tr>
<td> Sleeping </td>
<td> TAG_Byte </td>
<td>
</td></tr>
<tr>
<td> Fire </td>
<td> TAG_Short </td>
<td>
</td></tr>
<tr>
<td> FallDistance </td>
<td> TAG_Float </td>
<td>
</td></tr>
<tr>
<td> Rotation </td>
<td> TAG_List(2 TAG_Float) </td>
<td>
</td></tr>
<tr>
<td> DeathTime </td>
<td> TAG_Short </td>
<td>
</td></tr>
<tr>
<td> SpawnX </td>
<td> TAG_Int </td>
<td> Only present when spawn is set elsewhere
</td></tr>
<tr>
<td> SpawnY </td>
<td> TAG_Int </td>
<td> Only present when spawn is set elsewhere
</td></tr>
<tr>
<td> SpawnZ </td>
<td> TAG_Int </td>
<td> Only present when spawn is set elsewhere
</td></tr></table>
<p><br />
Inventory items are in the TAG_Compound format with the following tags:
</p>
<table class="wikitable">
<tr>
<th> Tag Name </th>
<th> Type </th>
<th> Description
</th></tr>
<tr>
<td> Slot </td>
<td> TAG_byte </td>
<td>
</td></tr>
<tr>
<td> id </td>
<td> TAG_Short </td>
<td>
</td></tr>
<tr>
<td> Damage </td>
<td> TAG_Short </td>
<td>
</td></tr>
<tr>
<td> Count </td>
<td> TAG_Byte </td>
<td>
</td></tr></table>
<h2><span class="mw-headline" id="Other_formats">Other formats</span></h2>
<p>The following format is not used in Beta.
May be the Alpha format.
</p>
<table class="wikitable">
<tr>
<th> Name </th>
<th> Type </th>
<th> Description
</th></tr>
<tr>
<td> Pos </td>
<td> List of 3 doubles </td>
<td> X, Y, and Z coordinates of the player position, in pixel coordinates
</td></tr>
<tr>
<td> Rotation </td>
<td> List of 2 doubles </td>
<td> Yaw and pitch of the player, in degrees
</td></tr></table>
<h1><span class="mw-headline" id="Map_Generation">Map Generation</span></h1>
<p>There are several approaches to map generation.
</p>
<h2><span class="mw-headline" id="Noise">Noise</span></h2>
<p>Two-dimensional noise functions can be used to provide a terrain height at certain coordinates.
</p>
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