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game/shared/rope_helpers.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef ROPE_HELPERS_H
+#define ROPE_HELPERS_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#include "mathlib/vector.h"
+
+
+//
+// This function can help you choose starting conditions for your rope. It is fairly
+// expensive (slightly less than 0.5ms for a 10-node rope), but it's within reason for the 
+// frequency we create ropes at.
+//
+// Input: 
+//    - rope endpoints
+//    - the number of nodes the client will be simulating (CRopeKeyframe::m_nSegments)
+//    - how low you want the rope to hang (below the lowest of the two endpoints)
+//
+// Output: 
+//	  - pOutputLength = length of the rope
+//    - pOutputSlack  = slack you should set to produce the desired hang
+//
+void CalcRopeStartingConditions( 
+	const Vector &vStartPos,
+	const Vector &vEndPos,
+	int const nNodes,
+	float const desiredHang,
+	float *pOutputLength,
+	float *pOutputSlack
+	);
+
+
+#endif // ROPE_HELPERS_H