/**
* \file
* \copyright
* Copyright (c) 2012-2023, OpenGeoSys Community (http://www.opengeosys.org)
* Distributed under a Modified BSD License.
* See accompanying file LICENSE.txt or
* http://www.opengeosys.org/project/license
*
*/
#include "FaceRule.h"
#include <Eigen/Geometry>
#include "Element.h"
#include "MathLib/MathTools.h"
#include "MeshLib/Node.h"
namespace MeshLib
{
bool FaceRule::testElementNodeOrder(Element const& e)
{
return getSurfaceNormal(e)[2] < 0;
}
Eigen::Vector3d FaceRule::getFirstSurfaceVector(Element const& e)
{
Eigen::Vector3d const v =
e.getNode(0)->asEigenVector3d() - e.getNode(1)->asEigenVector3d();
return v;
}
Eigen::Vector3d FaceRule::getSecondSurfaceVector(Element const& e)
{
Eigen::Vector3d const v =
e.getNode(2)->asEigenVector3d() - e.getNode(1)->asEigenVector3d();
return v;
}
Eigen::Vector3d FaceRule::getSurfaceNormal(Element const& e)
{
Eigen::Vector3d const u = getFirstSurfaceVector(e);
Eigen::Vector3d const v = getSecondSurfaceVector(e);
return u.cross(v);
}
} // namespace MeshLib