62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2015 by Blender Foundation.
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* All rights reserved.
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*
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* The Original Code is: all of this file.
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*
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* ***** END GPL LICENSE BLOCK *****
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* */
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/** \file blender/blenlib/intern/math_solvers.c
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* \ingroup bli
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*/
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#include "MEM_guardedalloc.h"
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#include "BLI_math.h"
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#include "BLI_utildefines.h"
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#include "BLI_strict_flags.h"
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#include "eigen3_capi.h"
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/********************************** Eigen Solvers *********************************/
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/**
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* \brief Compute the eigen values and/or vectors of given 3D symmetric (aka adjoint) matrix.
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*
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* \param m3 the 3D symmetric matrix.
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* \return r_eigen_values the computed eigen values (NULL if not needed).
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* \return r_eigen_vectors the computed eigen vectors (NULL if not needed).
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*/
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bool BLI_eigen_solve_selfadjoint_m3(const float m3[3][3], float r_eigen_values[3], float r_eigen_vectors[3][3])
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{
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#ifndef NDEBUG
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/* We must assert given matrix is self-adjoint (i.e. symmetric) */
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if ((m3[0][1] != m3[1][0]) ||
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(m3[0][2] != m3[2][0]) ||
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(m3[1][2] != m3[2][1]))
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{
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BLI_assert(0);
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}
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#endif
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return EG3_self_adjoint_eigen_solve(3, (const float *)m3, r_eigen_values, (float *)r_eigen_vectors);
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}
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