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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// $NoKeywords: $
//=============================================================================//
#include "cbase.h"
#include "game.h"
#include "cplane.h"
// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"
//=========================================================
// Plane
//=========================================================
CPlane::CPlane ( void )
{
m_fInitialized = FALSE;
}
//=========================================================
// InitializePlane - Takes a normal for the plane and a
// point on the plane and
//=========================================================
void CPlane::InitializePlane ( const Vector &vecNormal, const Vector &vecPoint )
{
m_vecNormal = vecNormal;
m_flDist = DotProduct ( m_vecNormal, vecPoint );
m_fInitialized = TRUE;
}
//=========================================================
// PointInFront - determines whether the given vector is
// in front of the plane.
//=========================================================
bool CPlane::PointInFront ( const Vector &vecPoint )
{
float flFace;
if ( !m_fInitialized )
{
return FALSE;
}
flFace = DotProduct ( m_vecNormal, vecPoint ) - m_flDist;
if ( flFace >= 0 )
{
return TRUE;
}
return FALSE;
}
//=========================================================
//=========================================================
float CPlane::PointDist ( const Vector &vecPoint )
{
float flDist;
if ( !m_fInitialized )
{
return FALSE;
}
flDist = DotProduct ( m_vecNormal, vecPoint ) - m_flDist;
return flDist;
}
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