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<title>MathGL 2.1.2: B.2 MGLD format</title>

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<a name="MGLD-format-1"></a>
<h2 class="section">B.2 MGLD format</h2>

<p>MGLD is textual file, which contain all required information for drawing 3D image, i.e. it contain vertexes with colors and normales, primitives with all properties, textures, and glyph descriptions. MGLD file can be imported or viewed separately, without parsing data files itself.
</p>
<p>MGLD file start from string
</p><pre class="verbatim">MGLD npnts nprim ntxtr nglfs # optional description
</pre><p>which contain signature &lsquo;<samp>MGLD</samp>&rsquo; and number of points <var>npnts</var>, number of primitives <var>nprim</var>, number of textures <var>ntxtr</var>, number of glyph descriptions <var>nglfs</var>, and optional description. Empty strings and string with &lsquo;<samp>#</samp>&rsquo; are ignored.
</p>
<p>Next, file contain <var>npnts</var> strings with points coordinates and colors. The format of each string is
</p><pre class="verbatim">x y z c t ta u v w r g b a
</pre><p>Here <var>x</var>, <var>y</var>, <var>z</var> are coordinates, <var>c</var>, <var>t</var> are color indexes in texture, <var>ta</var> is normalized <var>t</var> according to current alpha setting, <var>u</var>, <var>v</var>, <var>w</var> are coordinates of normal vector (can be <code>NAN</code> if disabled), <var>r</var>, <var>g</var>, <var>b</var>, <var>a</var> are RGBA color values.
</p>
<p>Next, file contain <var>nprim</var> strings with properties of primitives. The format of each string is
</p><pre class="verbatim">type n1 n2 n3 n4 id s w p
</pre><p>Here <var>type</var> is kind of primitive (0 - mark, 1 - line, 2 - triangle, 3 - quadrangle, 4 - glyph), <var>n1</var>...<var>n4</var> is index of point for vertexes,  <var>id</var> is primitive identification number, <var>s</var> and <var>w</var> are size and width if applicable, <var>p</var> is scaling factor for glyphs.
</p>
<p>Next, file contain <var>ntxtr</var> strings with descriptions of textures. The format of each string is
</p><pre class="verbatim">smooth alpha colors
</pre><p>Here <var>smooth</var> set to enable smoothing between colors, <var>alpha</var> set to use half-transparent texture, <var>colors</var> contain color scheme itself as it described in <a href="mathgl_en_24.html#Color-scheme">Color scheme</a>.
</p>
<p>Finally, file contain <var>nglfs</var> entries with description of each glyph used in the figure. The format of entries are
</p><pre class="verbatim">nT nL
xA yA xB yB xC yC ...
xP yP ...
</pre><p>Here nT is the number of triangles; nL is the number of line vertexes; xA, yA, xB, yB, xC, yC are coordinates of triangles; and xP, yP, xQ, yQ are coordinates of lines. Line coordinate xP=0x3fff, yP=0x3fff denote line breaking.
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