source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/Triangle3.h @ 3070

#ifndef __TRIANGLE3_H
#define __TRIANGLE3_H

#include "Vector3.h"


namespace CHCDemoEngine 
{

class AxisAlignedBox3;
class Plane3;


struct Triangle3 
{
        Triangle3() {};
        Triangle3(const Vector3 &a, const Vector3 &b, const Vector3 &c);

        void Init(const Vector3 &a, const Vector3 &b, const Vector3 &c);

        Vector3 GetNormal() const;

        Vector3 GetWorldCenter() const;

        float GetSpatialAngle(const Vector3 &point) const;

        float GetArea() const;
        /** returns bounding box around this triangle
        */
        AxisAlignedBox3 GetBoundingBox() const;
        /** Intersects triangle with plane, returns intersection points
                if intersection is happening.

                @returns true if triangle intersects plane
        */
        bool GetPlaneIntersection(const Plane3 &plane, 
                                                          Vector3 &intersectA, 
                                                          Vector3 &intersectB) const;

        /** Returns false if this triangle is ill-defined, true otherwise
        */
        bool Valid() const;
          
        friend std::ostream& operator<< (std::ostream &s, const Triangle3 &A);
        friend std::istream& operator>> (std::istream &s, Triangle3 &A);


        ///////////////////

        /// the triangle vertices
        Vector3 mVertices[3];
};


// Overload << operator for C++-style output
inline std::ostream&
operator<< (std::ostream &s, const Triangle3 &A)
{
  return s << "(" << A.mVertices[0] << ", " << A.mVertices[1] << ", " << A.mVertices[2] << ")";
}

// Overload >> operator for C++-style input
inline std::istream&
operator>> (std::istream &s, Triangle3 &A)
{
  char a;
  // read "(x, y, z)"
  return s >> a >> A.mVertices[0] >> a >> A.mVertices[1] >> a >> A.mVertices[2] >> a;
}


}

#endif