46 lines
1.9 KiB
C++
46 lines
1.9 KiB
C++
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// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License
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// v. 2.0. If a copy of the MPL was not distributed with this file, You can
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// obtain one at http://mozilla.org/MPL/2.0/.
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#include "cross.h"
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// http://www.antisphere.com/Wiki/tools:anttweakbar
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IGL_INLINE void igl::cross(
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const double *a,
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const double *b,
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double *out)
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{
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out[0] = a[1]*b[2]-a[2]*b[1];
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out[1] = a[2]*b[0]-a[0]*b[2];
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out[2] = a[0]*b[1]-a[1]*b[0];
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}
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template <
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typename DerivedA,
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typename DerivedB,
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typename DerivedC>
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IGL_INLINE void igl::cross(
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const Eigen::PlainObjectBase<DerivedA> & A,
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const Eigen::PlainObjectBase<DerivedB> & B,
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Eigen::PlainObjectBase<DerivedC> & C)
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{
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assert(A.cols() == 3 && "#cols should be 3");
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assert(B.cols() == 3 && "#cols should be 3");
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assert(A.rows() == B.rows() && "#rows in A and B should be equal");
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C.resize(A.rows(),3);
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for(int d = 0;d<3;d++)
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{
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C.col(d) =
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A.col((d+1)%3).array() * B.col((d+2)%3).array() -
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A.col((d+2)%3).array() * B.col((d+1)%3).array();
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}
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}
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#ifdef IGL_STATIC_LIBRARY
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template void igl::cross<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<double, -1, -1, 0, -1, -1> >(Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> >&);
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template void igl::cross<Eigen::Matrix<double, 1, 3, 1, 1, 3>, Eigen::Matrix<double, 1, 3, 1, 1, 3>, Eigen::Matrix<double, -1, -1, 0, -1, -1> >(Eigen::PlainObjectBase<Eigen::Matrix<double, 1, 3, 1, 1, 3> > const&, Eigen::PlainObjectBase<Eigen::Matrix<double, 1, 3, 1, 1, 3> > const&, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> >&);
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#endif
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