CVectBase.cpp

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#include <cmath>
#include <iostream>

#include "popassert.h"
#include "CVector3f.h"
#include "CVectBase.h"



CVectBase::CVectBase() : m_ViewerPos(0,0,0), m_BoxPos(0,0,0)
{
  m_Radius = -1;
}


CVectBase::CVectBase(const CVector3f& viewerpos,
                     const CVector3f& boxpos,
                     float radius, bool update) :
  m_ViewerPos(viewerpos), m_BoxPos(boxpos)
{
  // Radius
  m_Radius = radius;

  if (update)
    Update();
}


void CVectBase::Update(void)
{
  // First vector
  m_B1 = m_BoxPos - m_ViewerPos;

  // Third vector
  if (m_B1.x == 0 && m_B1.y == 0)
    {
      m_B3 = CVector3f(0, 1, 0);
    }
  else
    {
      m_B3 = CVector3f(0, 0, 1) - (CVector3f(0, 0, 1) >> m_B1);
      m_B3.Normalize();
    }

  // Second vector
  m_B2 = m_B1 ^ m_B3;
  m_B2.Normalize();
}

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