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路径: \\game3dprogramming\materials\DarkPuzzle\libs\bullet_sdk\src\BulletDynamics\ConstraintSolver\btHingeConstraint.h

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/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/

This software is provided 'as-is', without any express or implied warranty.
In no event will the authors be held liable for any damages arising from the use of this software.
Permission is granted to anyone to use this software for any purpose, 
including commercial applications, and to alter it and redistribute it freely, 
subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/

/* Hinge Constraint by Dirk Gregorius. Limits added by Marcus Hennix at Starbreeze Studios */

#ifndef HINGECONSTRAINT_H
#define HINGECONSTRAINT_H

#include "LinearMath/btVector3.h"
#include "btJacobianEntry.h"
#include "btTypedConstraint.h"

class btRigidBody;

/// hinge constraint between two rigidbodies each with a pivotpoint that descibes the axis location in local space
/// axis defines the orientation of the hinge axis
class btHingeConstraint : public btTypedConstraint
{
#ifdef IN_PARALLELL_SOLVER
public:
#endif
	btJacobianEntry	m_jac[3]; //3 orthogonal linear constraints
	btJacobianEntry	m_jacAng[3]; //2 orthogonal angular constraints+ 1 for limit/motor

	btTransform m_rbAFrame; // constraint axii. Assumes z is hinge axis.
	btTransform m_rbBFrame;

	btScalar	m_motorTargetVelocity;
	btScalar	m_maxMotorImpulse;

	btScalar	m_limitSoftness; 
	btScalar	m_biasFactor; 
	btScalar    m_relaxationFactor; 

	btScalar    m_lowerLimit;	
	btScalar    m_upperLimit;	
	
	btScalar	m_kHinge;

	btScalar	m_limitSign;
	btScalar	m_correction;

	btScalar	m_accLimitImpulse;

	bool		m_angularOnly;
	bool		m_enableAngularMotor;
	bool		m_solveLimit;

	
public:

	btHingeConstraint(btRigidBody& rbA,btRigidBody& rbB, const btVector3& pivotInA,const btVector3& pivotInB, btVector3& axisInA,btVector3& axisInB);

	btHingeConstraint(btRigidBody& rbA,const btVector3& pivotInA,btVector3& axisInA);
	
	btHingeConstraint(btRigidBody& rbA,btRigidBody& rbB, const btTransform& rbAFrame, const btTransform& rbBFrame);

	btHingeConstraint(btRigidBody& rbA,const btTransform& rbAFrame);

	btHingeConstraint();

	virtual void	buildJacobian();

	virtual	void	solveConstraint(btScalar	timeStep);

	void	updateRHS(btScalar	timeStep);

	const btRigidBody& getRigidBodyA() const
	{
		return m_rbA;
	}
	const btRigidBody& getRigidBodyB() const
	{
		return m_rbB;
	}

	void	setAngularOnly(bool angularOnly)
	{
		m_angularOnly = angularOnly;
	}

	void	enableAngularMotor(bool enableMotor,btScalar targetVelocity,btScalar maxMotorImpulse)
	{
		m_enableAngularMotor  = enableMotor;
		m_motorTargetVelocity = targetVelocity;
		m_maxMotorImpulse = maxMotorImpulse;
	}

	void	setLimit(btScalar low,btScalar high,btScalar _softness = 0.9f, btScalar _biasFactor = 0.3f, btScalar _relaxationFactor = 1.0f)
	{
		m_lowerLimit = low;
		m_upperLimit = high;

		m_limitSoftness =  _softness;
		m_biasFactor = _biasFactor;
		m_relaxationFactor = _relaxationFactor;

	}

	btScalar	getLowerLimit() const
	{
		return m_lowerLimit;
	}

	btScalar	getUpperLimit() const
	{
		return m_upperLimit;
	}


	btScalar getHingeAngle();


	const btTransform& getAFrame() { return m_rbAFrame; };	
	const btTransform& getBFrame() { return m_rbBFrame; };

	inline int getSolveLimit()
	{
		return m_solveLimit;
	}

	inline btScalar getLimitSign()
	{
		return m_limitSign;
	}
		
};

#endif //HINGECONSTRAINT_H

btHingeConstraint.h

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