amxmodx/hlsdk/dlls/plane.cpp

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2006-08-27 02:22:59 +00:00
/***
*
* Copyright (c) 1996-2002, Valve LLC. All rights reserved.
*
* This product contains software technology licensed from Id
* Software, Inc. ("Id Technology"). Id Technology (c) 1996 Id Software, Inc.
* All Rights Reserved.
*
* Use, distribution, and modification of this source code and/or resulting
* object code is restricted to non-commercial enhancements to products from
* Valve LLC. All other use, distribution, or modification is prohibited
* without written permission from Valve LLC.
*
****/
#include "extdll.h"
#include "plane.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;
}