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public/vphysics/performance.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================//
+
+#ifndef PERFORMANCE_H
+#define PERFORMANCE_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+// Don't ever change these values, or face all kinds of subtle gameplay changes
+const float k_flMaxVelocity = 2000.0f;
+const float k_flMaxAngularVelocity = 360.0f * 10.0f;
+
+const float DEFAULT_MIN_FRICTION_MASS = 10.0f;
+const float DEFAULT_MAX_FRICTION_MASS = 2500.0f;
+struct physics_performanceparams_t
+{
+	int		maxCollisionsPerObjectPerTimestep;		// object will be frozen after this many collisions (visual hitching vs. CPU cost)
+	int		maxCollisionChecksPerTimestep;			// objects may penetrate after this many collision checks (can be extended in AdditionalCollisionChecksThisTick)
+	float	maxVelocity;							// limit world space linear velocity to this (in / s)
+	float	maxAngularVelocity;						// limit world space angular velocity to this (degrees / s)
+	float	lookAheadTimeObjectsVsWorld;			// predict collisions this far (seconds) into the future
+	float	lookAheadTimeObjectsVsObject;			// predict collisions this far (seconds) into the future
+	float	minFrictionMass;						// min mass for friction solves (constrains dynamic range of mass to improve stability)
+	float	maxFrictionMass;						// mas mass for friction solves
+
+	void Defaults()
+	{
+		maxCollisionsPerObjectPerTimestep = 6;
+		maxCollisionChecksPerTimestep = 250;
+		maxVelocity = k_flMaxVelocity;
+		maxAngularVelocity = k_flMaxAngularVelocity;
+		lookAheadTimeObjectsVsWorld = 1.0f;
+		lookAheadTimeObjectsVsObject = 0.5f;
+		minFrictionMass = DEFAULT_MIN_FRICTION_MASS;
+		maxFrictionMass = DEFAULT_MAX_FRICTION_MASS;
+	}
+};
+
+
+#endif // PERFORMANCE_H