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diff --git a/public/ScratchPadUtils.h b/public/ScratchPadUtils.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: This module contains helper functions for use with scratch pads.
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef SCRATCHPADUTILS_H
+#define SCRATCHPADUTILS_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#include "iscratchpad3d.h"
+
+
+// Use this to make a graph.
+class CScratchPadGraph
+{
+public:
+
+	typedef int LineID;
+
+	CScratchPadGraph();
+
+	// Initialze the orientation and scales of the two axes.
+	// Axis indices are 0, 1, or 2 for x, y, and z.
+	void Init( 
+		IScratchPad3D *pPad,
+
+		Vector vTimeAxis = Vector(0,-1,0),
+		float flInchesPerSecond=1,
+		Vector vTimeLineColor=Vector(0,0,1),
+		float flTimeOrigin=0,				// Where the origin of the graph is.
+
+		float flTimeLabelEveryNSeconds=1,
+		
+		Vector vValueAxis = Vector(0,0,1),
+		float flInchesPerValue=1,
+		Vector vValueLineColor=Vector(1,0,0),
+		float flValueOrigin=0				// Where the origin of the graph is.
+
+		);
+
+	bool IsInitted() const;
+
+	// Add another line into the graph.
+	LineID AddLine( Vector vColor );
+	void AddSample( LineID iLine, float flTime, float flValue );
+	void AddVerticalLine( float flTime, float flMinValue, float flMaxValue, const CSPColor &vColor );
+	
+	// Get the 3D position of a sample on the graph (so you can draw other things there).
+	Vector GetSamplePosition( float flTime, float flValue );
+
+
+private:
+
+	void UpdateTicksAndStuff( float flTime, float flValue );
+
+		
+
+private:
+	class CLineInfo
+	{
+	public:
+		bool m_bFirst;
+		float m_flLastTime;
+		float m_flLastValue;
+		Vector m_vColor;
+	};
+
+	IScratchPad3D *m_pPad;
+
+	CUtlVector<CLineInfo> m_LineInfos;
+
+	Vector m_vTimeAxis;
+	float m_flInchesPerSecond;
+
+	Vector m_vValueAxis;
+	float m_flInchesPerValue;
+
+	// How often to make a time label.
+	float m_flTimeLabelEveryNSeconds;
+	int m_nTimeLabelsDrawn;
+
+	Vector m_vTimeLineColor;
+	Vector m_vValueLineColor;
+
+	float m_flTimeOrigin;
+	float m_flValueOrigin;
+	
+	// Used to extend the value border.
+	float m_flHighestValue;
+	float m_flHighestTime;
+};
+
+
+
+// Draw a cone.
+void ScratchPad_DrawLitCone( 
+	IScratchPad3D *pPad,
+	const Vector &vBaseCenter,
+	const Vector &vTip,
+	const Vector &vBrightColor,
+	const Vector &vDarkColor,
+	const Vector &vLightDir,
+	float baseWidth,
+	int nSegments );
+
+
+// Draw a cylinder.
+void ScratchPad_DrawLitCylinder( 
+	IScratchPad3D *pPad,
+	const Vector &v1,
+	const Vector &v2,
+	const Vector &vBrightColor,
+	const Vector &vDarkColor,
+	const Vector &vLightDir,
+	float width,
+	int nSegments );
+
+
+// Draw an arrow.
+void ScratchPad_DrawArrow( 
+	IScratchPad3D *pPad,
+	const Vector &vPos, 
+	const Vector &vDirection,
+	const Vector &vColor, 
+	float flLength=20, 
+	float flLineWidth=3,
+	float flHeadWidth=8,
+	int nCylinderSegments=5,
+	int nHeadSegments=8,
+	float flArrowHeadPercentage = 0.3f	// How much of the line is the arrow head.
+	);
+
+
+// Draw an arrow with less parameters.. it generates parameters based on length
+// automatically to make the arrow look good.
+void ScratchPad_DrawArrowSimple( 
+	IScratchPad3D *pPad,
+	const Vector &vPos, 
+	const Vector &vDirection,
+	const Vector &vColor, 
+	float flLength );
+
+void ScratchPad_DrawSphere(
+	IScratchPad3D *pPad,
+	const Vector &vCenter,
+	float flRadius,
+	const Vector &vColor,
+	int nSubDivs=7 );
+
+
+void ScratchPad_DrawAABB(
+	IScratchPad3D *pPad,
+	const Vector &vMins,
+	const Vector &vMaxs,
+	const Vector &vColor = Vector( 1,1,1 ) );
+
+
+#endif // SCRATCHPADUTILS_H