Plane.cpp

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#include "Plane.h"

Plane::Plane( const Vector3 &v1, const Vector3 &v2, const Vector3 &v3 ) {
  setPlane(v1,v2,v3);
}

Plane::Plane( Vector3 normal, Vector3 point){
    setPlane(normal,point);
}

Plane::Plane() { }

Plane::~Plane( void ) { }

void Plane::setPlane( const Vector3 &v1, const Vector3 &v2, const Vector3 &v3 ) {
  Vector3 aux1, aux2;
  Vector3 h1 = v1;
  Vector3 h3= v3;
  aux1 = h1 - v2;
  aux2 = h3 - v2;
  normal = aux2  * aux1;
  normal.normalize();
  point.copy(v2);
  d = -(normal.innerProduct(point));
}

void Plane::setPlane( const Vector3 &normal, const Vector3 &point ) {
  this->normal.copy( normal );
  this->point.copy( point );
  this->normal.normalize();
  d = -(this->normal.innerProduct(point));
}

void Plane::setPlane( float a, float b, float c, float d ) {
  // set the normal vector
  normal.set(a,b,c);
  //compute the lenght of the vector
  float l = normal.length();
  // normalize the vector
  normal.set(a/l,b/l,c/l);
  // and divide d by th length as well
  this->d = d/l;
}

float Plane::distance( const Vector3 &p ) {
  return d + normal.innerProduct(p);
}

Vector3 Plane::getNormal( void ) {
  return this->normal;
}