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game/server/cplane.cpp

@@ -0,0 +1,71 @@
+//========= 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;
+}