ViewRay.h

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/********************************************************************
**                Image Component Library (ICL)                    **
**                                                                 **
** Copyright (C) 2006-2013 CITEC, University of Bielefeld          **
**                         Neuroinformatics Group                  **
** Website: www.iclcv.org and                                      **
**          http://opensource.cit-ec.de/projects/icl               **
**                                                                 **
** File   : ICLGeom/src/ICLGeom/ViewRay.h                          **
** Module : ICLGeom                                                **
** Authors: Christof Elbrechter                                    **
**                                                                 **
**                                                                 **
** GNU LESSER GENERAL PUBLIC LICENSE                               **
** This file may be used under the terms of the GNU Lesser General **
** Public License version 3.0 as published by the                  **
**                                                                 **
** Free Software Foundation and appearing in the file LICENSE.LGPL **
** included in the packaging of this file.  Please review the      **
** following information to ensure the license requirements will   **
** be met: http://www.gnu.org/licenses/lgpl-3.0.txt                **
**                                                                 **
** The development of this software was supported by the           **
** Excellence Cluster EXC 277 Cognitive Interaction Technology.    **
** The Excellence Cluster EXC 277 is a grant of the Deutsche       **
** Forschungsgemeinschaft (DFG) in the context of the German       **
** Excellence Initiative.                                          **
**                                                                 **
********************************************************************/

#pragma once

#include <ICLUtils/CompatMacros.h>
#include <ICLGeom/GeomDefs.h>
#include <ICLUtils/Exception.h>
#include <ICLUtils/Point32f.h>
#include <iostream>

namespace icl{
  namespace geom{
    struct PlaneEquation;

    struct ICLGeom_API ViewRay{
      explicit ViewRay(const Vec &offset=Vec(), const Vec &direction=Vec(), bool autoNormalizeDirection=false);

      Vec offset;

      Vec direction;


      Vec getIntersection(const PlaneEquation &plane) const ;

      enum TriangleIntersection{
        noIntersection,
        foundIntersection,
        wrongDirection,
        degenerateTriangle,
        rayIsCollinearWithTriangle
      };


      TriangleIntersection getIntersectionWithTriangle(const geom::Vec &a, const geom::Vec &b, const geom::Vec &c,
                                                       geom::Vec *intersectionPoint=0,
                                                       utils::Point32f *parametricCoords=0) const;


      float closestDistanceTo(const Vec &p) const;

      float closestSqrDistanceTo(const Vec &p) const;


      float closestDistanceTo(const ViewRay &other) const;


      Vec operator()(float lambda) const;
    };

    ICLGeom_API std::ostream &operator<<(std::ostream &s, const ViewRay &vr);
  } // namespace geom
}