libigl_Martin/include/igl/local_basis.cpp

#include "local_basis.h"

#include <sstream>
#include <string>
#include <fstream>

#include <vector>
#include <Eigen/Geometry>

using namespace Eigen;
using namespace std;

namespace igl
{

  template <typename DerivedV, typename DerivedF>
  IGL_INLINE void local_basis(
    const Eigen::PlainObjectBase<DerivedV>& V,
    const Eigen::PlainObjectBase<DerivedF>& F,
    Eigen::PlainObjectBase<DerivedV>& B1,
    Eigen::PlainObjectBase<DerivedV>& B2,
    Eigen::PlainObjectBase<DerivedV>& B3
    )
  {
    B1.resize(F.rows(),3);
    B2.resize(F.rows(),3);
    B3.resize(F.rows(),3);

    for (unsigned i=0;i<F.rows();++i)
    {
      RowVector3d v1 = (V.row(F(i,1)) - V.row(F(i,0))).normalized();
      RowVector3d t = V.row(F(i,2)) - V.row(F(i,0));
      RowVector3d v3 = v1.cross(t).normalized();
      RowVector3d v2 = v1.cross(v3).normalized();

      B1.row(i) = v1;
      B2.row(i) = v2;
      B3.row(i) = v3;
    }

  }

}

#ifndef IGL_HEADER_ONLY
// Explicit template specialization
// generated by autoexplicit.sh
#endif