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<a href="#libg3d-face.description" class="shortcut">Description</a></span>
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<a name="libg3d-face"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="libg3d-face.top_of_page"></a>face</span></h2>
<p>face — Face manipulation</p>
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<div class="refsect1">
<a name="libg3d-face.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
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<tbody>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="libg3d-face.html#G3D-FLAG-MAT-TWOSIDE:CAPS" title="G3D_FLAG_MAT_TWOSIDE">G3D_FLAG_MAT_TWOSIDE</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="libg3d-face.html#G3D-FLAG-FAC-NORMALS:CAPS" title="G3D_FLAG_FAC_NORMALS">G3D_FLAG_FAC_NORMALS</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="libg3d-face.html#G3D-FLAG-FAC-TEXMAP:CAPS" title="G3D_FLAG_FAC_TEXMAP">G3D_FLAG_FAC_TEXMAP</a></td>
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<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libg3d-face.html#g3d-face-get-normal" title="g3d_face_get_normal ()">g3d_face_get_normal</a> <span class="c_punctuation">()</span>
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<td class="function_type">
<span class="returnvalue">void</span>
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<td class="function_name">
<a class="link" href="libg3d-face.html#g3d-face-free" title="g3d_face_free ()">g3d_face_free</a> <span class="c_punctuation">()</span>
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<div class="refsect1">
<a name="libg3d-face.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody><tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="libg3d-face.html#G3DFace" title="G3DFace">G3DFace</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libg3d-face.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <g3d/face.h>
</pre>
</div>
<div class="refsect1">
<a name="libg3d-face.description"></a><h2>Description</h2>
<p>A face is plane bordered by at least 3 vertices.</p>
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<div class="refsect1">
<a name="libg3d-face.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<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>
</div>
<hr>
<div class="refsect2">
<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>
</div>
<hr>
<div class="refsect2">
<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>
</div>
<hr>
<div class="refsect2">
<a name="g3d-face-get-normal"></a><h3>g3d_face_get_normal ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
g3d_face_get_normal (<em class="parameter"><code><a class="link" href="libg3d-face.html#G3DFace" title="G3DFace"><span class="type">G3DFace</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="libg3d-object.html#G3DObject" title="G3DObject"><span class="type">G3DObject</span></a> *object</code></em>,
<em class="parameter"><code><a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat"><span class="type">G3DFloat</span></a> *nx</code></em>,
<em class="parameter"><code><a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat"><span class="type">G3DFloat</span></a> *ny</code></em>,
<em class="parameter"><code><a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat"><span class="type">G3DFloat</span></a> *nz</code></em>);</pre>
<p>calculates the normal of a face.</p>
<div class="refsect3">
<a name="id-1.2.6.7.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
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<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p>face to calculate normal of</p></td>
<td class="parameter_annotations"> </td>
</tr>
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<td class="parameter_name"><p>object</p></td>
<td class="parameter_description"><p>object containing vertices of face</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>nx</p></td>
<td class="parameter_description"><p>x component of resulting normal</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>ny</p></td>
<td class="parameter_description"><p>y component of resulting normal</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>nz</p></td>
<td class="parameter_description"><p>z component of resulting normal</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.7.5.6"></a><h4>Returns</h4>
<p> TRUE on success, FALSE else</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="g3d-face-free"></a><h3>g3d_face_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
g3d_face_free (<em class="parameter"><code><a class="link" href="libg3d-face.html#G3DFace" title="G3DFace"><span class="type">G3DFace</span></a> *face</code></em>);</pre>
<p>Frees all memory allocated for this face.</p>
<div class="refsect3">
<a name="id-1.2.6.7.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p>the face to free</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="libg3d-face.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<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>
<div class="refsect3">
<a name="id-1.2.6.8.2.5"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
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<td class="struct_member_name"><p><span class="type">guint32</span> <em class="structfield"><code><a name="G3DFace.vertex-count"></a>vertex_count</code></em>;</p></td>
<td class="struct_member_description"><p>number of vertices</p></td>
<td class="struct_member_annotations"> </td>
</tr>
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<td class="struct_member_name"><p><span class="type">guint32</span> *<em class="structfield"><code><a name="G3DFace.vertex-indices"></a>vertex_indices</code></em>;</p></td>
<td class="struct_member_description"><p>indices of vertices in <a class="link" href="libg3d-object.html#G3DObject" title="G3DObject"><span class="type">G3DObject</span></a></p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a class="link" href="libg3d-material.html#G3DMaterial" title="G3DMaterial"><span class="type">G3DMaterial</span></a> *<em class="structfield"><code><a name="G3DFace.material"></a>material</code></em>;</p></td>
<td class="struct_member_description"><p>material to use for surface</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">guint32</span> <em class="structfield"><code><a name="G3DFace.flags"></a>flags</code></em>;</p></td>
<td class="struct_member_description"><p>flags</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a class="link" href="libg3d-vector.html#G3DVector" title="G3DVector"><span class="type">G3DVector</span></a> *<em class="structfield"><code><a name="G3DFace.normals"></a>normals</code></em>;</p></td>
<td class="struct_member_description"><p>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)</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="type">G3DImage</span></a> *<em class="structfield"><code><a name="G3DFace.tex-image"></a>tex_image</code></em>;</p></td>
<td class="struct_member_description"><p>optional texture image</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">guint32</span> <em class="structfield"><code><a name="G3DFace.tex-vertex-count"></a>tex_vertex_count</code></em>;</p></td>
<td class="struct_member_description"><p>number of texture vertices, should be 0 or match
vertex_count</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a class="link" href="libg3d-vector.html#G3DVector" title="G3DVector"><span class="type">G3DVector</span></a> *<em class="structfield"><code><a name="G3DFace.tex-vertex-data"></a>tex_vertex_data</code></em>;</p></td>
<td class="struct_member_description"><p>array of texture vertices</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
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