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/*****************************************************************************
* $CAMITK_LICENCE_BEGIN$
*
* CamiTK - Computer Assisted Medical Intervention ToolKit
* (c) 2001-2024 Univ. Grenoble Alpes, CNRS, Grenoble INP - UGA, TIMC, 38000 Grenoble, France
*
* Visit http://camitk.imag.fr for more information
*
* This file is part of CamiTK.
*
* CamiTK is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* CamiTK 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 version 3 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with CamiTK. If not, see <http://www.gnu.org/licenses/>.
*
* $CAMITK_LICENCE_END$
****************************************************************************/
#include "ShakerLib.h"
#include <cmath> // for sqrt
#include <cstdlib> // for rand
// --------------- randomDisplacement -------------------
void ShakerLib::randomDisplacement(float* pos, unsigned int nrOfPoints, double maxDisplacement) {
// Move all the points
for (unsigned int i = 0; i < nrOfPoints; i++) {
// compute the random displacement
float randomDisplacement[3];
float factor = 0.0;
for (float& value : randomDisplacement) {
value = -1. + 2.0 * ((double) rand()) / ((double) RAND_MAX);
factor += value * value;
}
// scale up to max
factor = maxDisplacement * ((double) rand()) / ((double) RAND_MAX) / sqrt(factor);
// move randomly
for (unsigned int j = 0; j < 3; j++) {
randomDisplacement[j] *= factor;
pos[i * 3 + j] += randomDisplacement[j];
}
}
}
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