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// Demeter Terrain Visualization Library by Clay Fowler
// Copyright (C) 2002 Clay Fowler
// $ID$
/*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#ifndef _PLANE_DEMETER_H_
#define _PLANE_DEMETER_H_
#include "Demeter/Vector.h"
/// \brief The Demeter Terrain Engine.
namespace Demeter
{
/// \brief An extremely basic 3D plane class.
/// This simple class is only used by Demeter for ray tracing and elevation finding calculations.
/// It is certainly not meant to be a generally useful class for any other purpose, but it since
/// it represents the classic plane equation (Ax + By + Cz + D = 0), you might find it useful...
class TERRAIN_API Plane
{
public:
/// \brief Creates a new plane that is coincident with the x-y plane.
Plane()
{
}
/// \brief Creates a new plane defined by the provided 3 points.
/// \param p1 A 3D point (one of three specifying the orientation of the plane.)
/// \param p2 A 3D point (one of three specifying the orientation of the plane.)
/// \param p3 A 3D point (one of three specifying the orientation of the plane.)
Plane(Vector & p1, Vector & p2, Vector & p3);
/// \brief Destructor for Plane.
~Plane()
{
}
/// \brief Specifies that this plane is oriented such that its surface includes all 3 points.
/// \param p1 A 3D point (one of three specifying the orientation of the plane.)
/// \param p2 A 3D point (one of three specifying the orientation of the plane.)
/// \param p3 A 3D point (one of three specifying the orientation of the plane.)
void DefineFromPoints(Vector & p1, Vector & p2, Vector & p3);
/// A in the classic plane equation (Ax + By + Cz + D = 0)
float a;
/// B in the classic plane equation (Ax + By + Cz + D = 0)
float b;
/// C in the classic plane equation (Ax + By + Cz + D = 0)
float c;
/// D in the classic plane equation (Ax + By + Cz + D = 0)
float d;
};
}
#endif
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