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diff --git a/src/others/mimesh/libg3d-0.0.8/include/g3d/quat.h b/src/others/mimesh/libg3d-0.0.8/include/g3d/quat.h
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+/* $Id:$ */
+
+/*
+    libg3d - 3D object loading library
+
+    Copyright (C) 2005-2009  Markus Dahms <mad@automagically.de>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+#ifndef _G3D_QUAT_H
+#define _G3D_QUAT_H
+
+#include <g3d/types.h>
+
+/**
+ * SECTION:quat
+ * @short_description: quaternion helpers
+ * @include: g3d/quat.h
+ */
+
+/**
+ * g3d_quat_normalize:
+ * @q: a quaternion
+ *
+ * normalize the quaternion to a length of 1.0.
+ *
+ * Returns: TRUE on success, FALSE else
+ */
+EAPI
+gboolean g3d_quat_normalize(G3DQuat *q);
+
+/**
+ * g3d_quat_rotate:
+ * @q: resulting quat
+ * @axis: rotation axis
+ * @angle: rotation angle
+ *
+ * Encode a rotation around an axis into quaternion.
+ *
+ * Returns: TRUE on success, FALSE else
+ */
+EAPI
+gboolean g3d_quat_rotate(G3DQuat *q, G3DVector *axis, G3DFloat angle);
+
+/**
+ * g3d_quat_add:
+ * @qr: result quat
+ * @q1: first quat
+ * @q2: second quat
+ *
+ * Add two quats.
+ *
+ * Returns: TRUE on success, FALSE else
+ */
+EAPI
+gboolean g3d_quat_add(G3DQuat *qr, G3DQuat *q1, G3DQuat *q2);
+
+/**
+ * g3d_quat_trackball:
+ * @q: resulting quaternion
+ * @x1: x value of first point
+ * @y1: y value of first point
+ * @x2: x value of second point
+ * @y2: y value of second point
+ * @r: radius of virtual trackball, usually 0.8
+ *
+ * Emulate a virtual trackball movement and return rotation as quaternion.
+ * The x and y values of the starting and end point of the movement have
+ * to be in the range -1.0 .. 1.0.
+ *
+ * Returns: TRUE on success, FALSE else
+ */
+EAPI
+gboolean g3d_quat_trackball(G3DQuat *q, G3DFloat x1, G3DFloat y1,
+        G3DFloat x2, G3DFloat y2, G3DFloat r);
+
+/**
+ * g3d_quat_to_matrix:
+ * @q: source quat
+ * @matrix: resulting matrix
+ *
+ * Convert a quaternion to a transformation matrix.
+ *
+ * Returns: TRUE on success, FALSE else
+ */
+EAPI
+gboolean g3d_quat_to_matrix(G3DQuat *q, G3DMatrix *matrix);
+
+/**
+ * g3d_quat_to_rotation_xyz:
+ * @q: a quaternion
+ * @rx: rotation around x axis
+ * @ry: rotation around y axis
+ * @rz: rotation around z axis
+ *
+ * Calculate the rotation around the three coordinate axes from a given
+ * quaternion.
+ *
+ * Returns: TRUE on success, FALSE else
+ */
+EAPI
+gboolean g3d_quat_to_rotation_xyz(G3DQuat *q, G3DFloat *rx, G3DFloat *ry,
+        G3DFloat *rz);
+
+#endif /* _G3D_QUAT_H */