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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
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<title>face</title>
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<tr><td colspan="5" class="shortcuts"><nobr><a href="#libg3d-face.synopsis" class="shortcut">Top</a>
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<a href="#libg3d-face.description" class="shortcut">Description</a></nobr></td></tr>
</table>
<div class="refentry" lang="en">
<a name="libg3d-face"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libg3d-face.top_of_page"></a>face</span></h2>
<p>face — Face manipulation</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="libg3d-face.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <g3d/face.h>
#define <a class="link" href="libg3d-face.html#G3D-FLAG-MAT-TWOSIDE:CAPS" title="G3D_FLAG_MAT_TWOSIDE">G3D_FLAG_MAT_TWOSIDE</a>
#define <a class="link" href="libg3d-face.html#G3D-FLAG-FAC-NORMALS:CAPS" title="G3D_FLAG_FAC_NORMALS">G3D_FLAG_FAC_NORMALS</a>
#define <a class="link" href="libg3d-face.html#G3D-FLAG-FAC-TEXMAP:CAPS" title="G3D_FLAG_FAC_TEXMAP">G3D_FLAG_FAC_TEXMAP</a>
<a class="link" href="libg3d-face.html#G3DFace" title="G3DFace">G3DFace</a>;
<a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"
>gboolean</a> <a class="link" href="libg3d-face.html#g3d-face-get-normal" title="g3d_face_get_normal ()">g3d_face_get_normal</a> (<a class="link" href="libg3d-face.html#G3DFace" title="G3DFace">G3DFace</a> *face,
<a class="link" href="libg3d-object.html#G3DObject" title="G3DObject">G3DObject</a> *object,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> *nx,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> *ny,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> *nz);
void <a class="link" href="libg3d-face.html#g3d-face-free" title="g3d_face_free ()">g3d_face_free</a> (<a class="link" href="libg3d-face.html#G3DFace" title="G3DFace">G3DFace</a> *face);
</pre>
</div>
<div class="refsect1" lang="en">
<a name="libg3d-face.description"></a><h2>Description</h2>
<p>
A face is plane bordered by at least 3 vertices.</p>
<p>
</p>
</div>
<div class="refsect1" lang="en">
<a name="libg3d-face.details"></a><h2>Details</h2>
<div class="refsect2" lang="en">
<a name="G3D-FLAG-MAT-TWOSIDE:CAPS"></a><h3>G3D_FLAG_MAT_TWOSIDE</h3>
<pre class="programlisting">#define G3D_FLAG_MAT_TWOSIDE (1L << 0)
</pre>
<p>
Faces using this material should be rendered two-sided as the direction
is unknown.</p>
<p>
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="G3D-FLAG-FAC-NORMALS:CAPS"></a><h3>G3D_FLAG_FAC_NORMALS</h3>
<pre class="programlisting">#define G3D_FLAG_FAC_NORMALS (1L << 0)
</pre>
<p>
The face has custom normals.</p>
<p>
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="G3D-FLAG-FAC-TEXMAP:CAPS"></a><h3>G3D_FLAG_FAC_TEXMAP</h3>
<pre class="programlisting">#define G3D_FLAG_FAC_TEXMAP (1L << 1)
</pre>
<p>
The face has a texture map and texture coordinates.</p>
<p>
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="G3DFace"></a><h3>G3DFace</h3>
<pre class="programlisting">typedef struct {
guint32 vertex_count;
guint32 *vertex_indices;
G3DMaterial *material;
guint32 flags;
G3DVector *normals;
G3DImage *tex_image;
guint32 tex_vertex_count;
G3DVector *tex_vertex_data;
} G3DFace;
</pre>
<p>
An object representing a surface.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"
>guint32</a> <em class="structfield"><code>vertex_count</code></em>;</span></p></td>
<td> number of vertices
</td>
</tr>
<tr>
<td><p><span class="term"><a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"
>guint32</a> *<em class="structfield"><code>vertex_indices</code></em>;</span></p></td>
<td> indices of vertices in <a class="link" href="libg3d-object.html#G3DObject" title="G3DObject"><span class="type">G3DObject</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="libg3d-material.html#G3DMaterial" title="G3DMaterial">G3DMaterial</a> *<em class="structfield"><code>material</code></em>;</span></p></td>
<td> material to use for surface
</td>
</tr>
<tr>
<td><p><span class="term"><a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"
>guint32</a> <em class="structfield"><code>flags</code></em>;</span></p></td>
<td> flags
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="libg3d-vector.html#G3DVector" title="G3DVector">G3DVector</a> *<em class="structfield"><code>normals</code></em>;</span></p></td>
<td> optional normal array (one vector - 3 <a class="link" href="libg3d-vector.html#G3DVector" title="G3DVector"><span class="type">G3DVector</span></a> values - for each
vertex)
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage">G3DImage</a> *<em class="structfield"><code>tex_image</code></em>;</span></p></td>
<td> optional texture image
</td>
</tr>
<tr>
<td><p><span class="term"><a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"
>guint32</a> <em class="structfield"><code>tex_vertex_count</code></em>;</span></p></td>
<td> number of texture vertices, should be 0 or match
vertex_count
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="libg3d-vector.html#G3DVector" title="G3DVector">G3DVector</a> *<em class="structfield"><code>tex_vertex_data</code></em>;</span></p></td>
<td> array of texture vertices
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g3d-face-get-normal"></a><h3>g3d_face_get_normal ()</h3>
<pre class="programlisting"><a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"
>gboolean</a> g3d_face_get_normal (<a class="link" href="libg3d-face.html#G3DFace" title="G3DFace">G3DFace</a> *face,
<a class="link" href="libg3d-object.html#G3DObject" title="G3DObject">G3DObject</a> *object,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> *nx,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> *ny,
<a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat">G3DFloat</a> *nz);</pre>
<p>
calculates the normal of a face.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>face</code></em> :</span></p></td>
<td> face to calculate normal of
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>object</code></em> :</span></p></td>
<td> object containing vertices of face
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>nx</code></em> :</span></p></td>
<td> x component of resulting normal
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ny</code></em> :</span></p></td>
<td> y component of resulting normal
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>nz</code></em> :</span></p></td>
<td> z component of resulting normal
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> TRUE on success, FALSE else
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g3d-face-free"></a><h3>g3d_face_free ()</h3>
<pre class="programlisting">void g3d_face_free (<a class="link" href="libg3d-face.html#G3DFace" title="G3DFace">G3DFace</a> *face);</pre>
<p>
Frees all memory allocated for this face.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>face</code></em> :</span></p></td>
<td> the face to free
</td>
</tr></tbody>
</table></div>
</div>
</div>
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