source: GTP/trunk/Lib/Vis/Preprocessing/src/Triangle3.h @ 860

#ifndef __TRIANGLE3_H
#define __TRIANGLE3_H

#include "Vector3.h"

namespace GtpVisibilityPreprocessor {

struct Triangle3 {
  
  Vector3 mVertices[3];
  
  Triangle3() {}
  Triangle3(const Vector3 &a,
                 const Vector3 &b,
                 const Vector3 &c
                 ) {
    Init(a, b, c);
  }

  void
  Init(const Vector3 &a,
       const Vector3 &b,
       const Vector3 &c
       ) {
    mVertices[0] = a;
    mVertices[1] = b;
    mVertices[2] = c;
    
  }

  Vector3 GetNormal() const {
    Vector3 v1=mVertices[0]-mVertices[1], v2=mVertices[2]-mVertices[1];
    return Normalize(CrossProd(v2,v1));
  }

  Vector3 GetCenter() const {
    return (mVertices[0] + mVertices[1] + mVertices[2])/3.0f;
  }

  float GetSpatialAngle(const Vector3 &point) const;

  float GetArea() const {
          Vector3 v1=mVertices[0]-mVertices[1], v2=mVertices[2]-mVertices[1];
          return 0.5f * Magnitude(CrossProd(v2, v1));
  }
};

}

#endif