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diff --git a/source/blender/blenlib/MTC_matrixops.h b/source/blender/blenlib/MTC_matrixops.h
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+++ b/source/blender/blenlib/MTC_matrixops.h
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+/*
+ * matrixops.h
+ *
+ * $Id$
+ *
+ * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version. The Blender
+ * Foundation also sells licenses for use in proprietary software under
+ * the Blender License.  See http://www.blender.org/BL/ for information
+ * about this.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL/BL DUAL LICENSE BLOCK *****
+ */
+
+#ifndef MATRIXOPS_H
+#define MATRIXOPS_H 
+
+#ifdef __cplusplus
+extern "C" { 
+#endif
+
+/* ------------------------------------------------------------------------- */
+/* need rewriting: */
+/**
+ * copy the left upp3 3 by 3 of m2 to m1
+ */
+void MTC_Mat3CpyMat4(float m1[][3], float m2[][4]);
+
+/* ------------------------------------------------------------------------- */
+/* operations based on 4 by 4 matrices */
+
+/**
+ * Copy m1 to m2
+ */
+void MTC_Mat4CpyMat4(float m1[][4], float m2[][4]);
+
+/**
+ * Multiply all matrices after the first, leave the result in the
+ * first argument
+ */
+void MTC_Mat4MulSerie(float answ[][4],
+					  float m1[][4], float m2[][4], float m3[][4],
+					  float m4[][4], float m5[][4], float m6[][4],
+					  float m7[][4], float m8[][4]);
+
+/**
+ * m1 = m2 matprod m3
+ */
+void MTC_Mat4MulMat4(float m1[][4], float m2[][4], float m3[][4]);
+
+/**
+ * Do vec^t prod mat, result in vec. Ignore vec[3] (vec is a
+ * float[3])
+ */
+void MTC_Mat4MulVecfl(float mat[][4], float *vec);
+
+/**
+ * Invert mat, result in inverse. Always returns 1
+ */
+int MTC_Mat4Invert(float inverse[][4], float mat[][4]);
+
+/**
+ * Make the set of mat orthonormal (mat should already be orthogonal)?
+ * (doesn't appear to normalise properly?)
+ */
+void MTC_Mat4Ortho(float mat[][4]);
+
+/**
+ * vec = mat prod vec, result in vec, ignore fourth component entirely
+ * (4th component is _not_ accessed!!! vec is 3d)
+ */
+void MTC_Mat4Mul3Vecfl(float mat[][4], float *vec);
+
+/**
+ * vec = mat prod vec, result in vec
+ */
+void MTC_Mat4MulVec4fl(float mat[][4], float *vec);
+
+/**
+ * Set <m> to the 4-D unity matrix
+ */
+void MTC_Mat4One(float m[][4]);
+
+/**
+ * Swap matrices m1 and m2
+ */
+void MTC_Mat4SwapMat4(float m1[][4], float m2[][4]);
+
+/**
+ * Copy m2 to the top-left 3x3 of m1, don't touch the remaining elements.
+ */
+void MTC_Mat4CpyMat3nc(float m1[][4], float m2[][3]);
+
+/**
+ * m1 = m2 * m3, but only the top-left 3x3
+ */
+void MTC_Mat4MulMat33(float m1[][3], float m2[][4], float m3[][3]); 
+
+/* ------------------------------------------------------------------------- */
+/* Operations based on 3 by 3 matrices */
+/**
+ * Do vec^t prod mat, result in vec.(vex is 3d)
+ */
+void MTC_Mat3MulVecfl(float mat[][3], float *vec);
+
+/**
+ * Copy m1 to m2
+ */
+void MTC_Mat3CpyMat3(float m1[][3], float m2[][3]);
+
+/**
+ * m1 = m2 prod m3
+ */
+void MTC_Mat3MulMat3(float m1[][3], float m3[][3], float m2[][3]);
+
+/**
+ * vec = vec prod mat
+ */
+void MTC_Mat3MulVecd(float mat[][3], double *vec);
+
+/**
+ * Guess: invert matrix
+ * result goes to m1
+ */
+void MTC_Mat3Inv(float m1[][3], float m2[][3]);
+
+/**
+ * Sort of a determinant matrix? Doesn't seem very adjoint to me...
+ * result goes to m1
+ */
+void MTC_Mat3Adj(float m1[][3], float m[][3]);
+
+/**
+ * Set <m> to the 3D unity matrix
+ */
+void MTC_Mat3One(float m[][3]);
+
+/* ------------------------------------------------------------------------- */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MATRIXOPS_H */