bullet3/examples/SoftDemo/SoftDemo.cpp

/*
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.
*/

///btSoftBody implementation by Nathanael Presson


#include "btBulletDynamicsCommon.h"
#include "BulletSoftBody/btSoftRigidDynamicsWorld.h"

#include "BulletCollision/CollisionDispatch/btSphereSphereCollisionAlgorithm.h"
#include "BulletCollision/NarrowPhaseCollision/btGjkEpa2.h"
#include "LinearMath/btQuickprof.h"
#include "LinearMath/btIDebugDraw.h"

#include "BunnyMesh.h"
#include "TorusMesh.h"
#include <stdio.h> //printf debugging
#include "LinearMath/btConvexHull.h"
#include "BulletSoftBody/btSoftBodyRigidBodyCollisionConfiguration.h"
#include "BulletSoftBody/btSoftBodyHelpers.h"

#include "SoftDemo.h"
#include "GL_ShapeDrawer.h"


#include "LinearMath/btAlignedObjectArray.h"
#include "BulletSoftBody/btSoftBody.h"


class btBroadphaseInterface;
class btCollisionShape;
class btOverlappingPairCache;
class btCollisionDispatcher;
class btConstraintSolver;
struct btCollisionAlgorithmCreateFunc;
class btDefaultCollisionConfiguration;

///collisions between two btSoftBody's
class btSoftSoftCollisionAlgorithm;

///collisions between a btSoftBody and a btRigidBody
class btSoftRididCollisionAlgorithm;
class btSoftRigidDynamicsWorld;

#include "../CommonInterfaces/CommonRigidBodyBase.h"


class SoftDemo : public CommonRigidBodyBase
{
public:

	btAlignedObjectArray<btSoftSoftCollisionAlgorithm*> m_SoftSoftCollisionAlgorithms;

	btAlignedObjectArray<btSoftRididCollisionAlgorithm*> m_SoftRigidCollisionAlgorithms;

	btSoftBodyWorldInfo	m_softBodyWorldInfo;

	

	bool								m_autocam;
	bool								m_cutting;
	bool								m_raycast;
	btScalar							m_animtime;
	btClock								m_clock;
	int									m_lastmousepos[2];
	btVector3							m_impact;
	btSoftBody::sRayCast				m_results;
	btSoftBody::Node*					m_node;
	btVector3							m_goal;
	bool								m_drag;


	//keep the collision shapes, for deletion/cleanup
	btAlignedObjectArray<btCollisionShape*>		m_collisionShapes;

	btBroadphaseInterface*	m_broadphase;

	btCollisionDispatcher*	m_dispatcher;


	btConstraintSolver*	m_solver;

	btCollisionAlgorithmCreateFunc*	m_boxBoxCF;

	btDefaultCollisionConfiguration* m_collisionConfiguration;


public:

	void	initPhysics();

	void	exitPhysics();

	SoftDemo(struct GUIHelperInterface* helper) 
		: CommonRigidBodyBase(helper),
		m_drag(false)

	{
		
	}
	virtual ~SoftDemo()
	{
		btAssert(m_dynamicsWorld==0);
	}

	//virtual void clientMoveAndDisplay();

	//virtual void displayCallback();

	void createStack( btCollisionShape* boxShape, float halfCubeSize, int size, float zPos );

	

	virtual	void setDrawClusters(bool drawClusters);

	virtual const btSoftRigidDynamicsWorld*	getSoftDynamicsWorld() const
	{
		///just make it a btSoftRigidDynamicsWorld please
		///or we will add type checking
		return (btSoftRigidDynamicsWorld*) m_dynamicsWorld;
	}

	virtual btSoftRigidDynamicsWorld*	getSoftDynamicsWorld()
	{
		///just make it a btSoftRigidDynamicsWorld please
		///or we will add type checking
		return (btSoftRigidDynamicsWorld*) m_dynamicsWorld;
	}

	//
	//void	clientResetScene();
	void	renderme();
	void	keyboardCallback(unsigned char key, int x, int y);
	void	mouseFunc(int button, int state, int x, int y);
	void	mouseMotionFunc(int x,int y);

	GUIHelperInterface*	getGUIHelper()
	{
		return m_guiHelper;
	}
};


#define MACRO_SOFT_DEMO(a) class SoftDemo##a : public SoftDemo\
{\
public:\
	static DemoApplication* Create()\
	{\
		SoftDemo* demo = new SoftDemo##a;\
		extern int current_demo;\
		current_demo=a;\
		demo->initPhysics();\
		return demo;\
	}\
};



//MACRO_SOFT_DEMO(0) //Init_Cloth
#if 0
MACRO_SOFT_DEMO(1) //Init_Pressure
MACRO_SOFT_DEMO(2)//Init_Volume
MACRO_SOFT_DEMO(3)//Init_Ropes
MACRO_SOFT_DEMO(4)//Init_Ropes_Attach
MACRO_SOFT_DEMO(5)//Init_ClothAttach
MACRO_SOFT_DEMO(6)//Init_Sticks
MACRO_SOFT_DEMO(7)//Init_Collide
MACRO_SOFT_DEMO(8)//Init_Collide2
MACRO_SOFT_DEMO(9)//Init_Collide3
MACRO_SOFT_DEMO(10)//Init_Impact
MACRO_SOFT_DEMO(11)//Init_Aero
MACRO_SOFT_DEMO(12)//Init_Friction
MACRO_SOFT_DEMO(13)//Init_Torus
MACRO_SOFT_DEMO(14)//Init_TorusMatch
MACRO_SOFT_DEMO(15)//Init_Bunny
MACRO_SOFT_DEMO(16)//Init_BunnyMatch
MACRO_SOFT_DEMO(17)//Init_Cutting1
MACRO_SOFT_DEMO(18)//Init_ClusterDeform
MACRO_SOFT_DEMO(19)//Init_ClusterCollide1
MACRO_SOFT_DEMO(20)//Init_ClusterCollide2
MACRO_SOFT_DEMO(21)//Init_ClusterSocket
MACRO_SOFT_DEMO(22)//Init_ClusterHinge
MACRO_SOFT_DEMO(23)//Init_ClusterCombine
MACRO_SOFT_DEMO(24)//Init_ClusterCar
MACRO_SOFT_DEMO(25)//Init_ClusterRobot
MACRO_SOFT_DEMO(26)//Init_ClusterStackSoft
MACRO_SOFT_DEMO(27)//Init_ClusterStackMixed
MACRO_SOFT_DEMO(28)//Init_TetraCube
MACRO_SOFT_DEMO(29)//Init_TetraBunny

#endif

extern float eye[3];
extern int glutScreenWidth;
extern int glutScreenHeight;

static bool sDemoMode = false;

const int maxProxies = 32766;
const int maxOverlap = 65535;

static btVector3*	gGroundVertices=0;
static int*	gGroundIndices=0;
static btBvhTriangleMeshShape* trimeshShape =0;
static btRigidBody* staticBody = 0;
static float waveheight = 5.f;

const float TRIANGLE_SIZE=8.f;
int		current_demo=20;
#define DEMO_MODE_TIMEOUT 15.f //15 seconds for each demo


#ifdef _DEBUG
const int gNumObjects = 1;
#else
const int gNumObjects = 1;//try this in release mode: 3000. never go above 16384, unless you increate maxNumObjects  value in DemoApplication.cp
#endif

const int maxNumObjects = 32760;

#define CUBE_HALF_EXTENTS 1.5
#define EXTRA_HEIGHT -10.f



//
void SoftDemo::createStack( btCollisionShape* boxShape, float halfCubeSize, int size, float zPos )
{
	btTransform trans;
	trans.setIdentity();

	for(int i=0; i<size; i++)
	{
		// This constructs a row, from left to right
		int rowSize = size - i;
		for(int j=0; j< rowSize; j++)
		{
			btVector3 pos;
			pos.setValue(
				-rowSize * halfCubeSize + halfCubeSize + j * 2.0f * halfCubeSize,
				halfCubeSize + i * halfCubeSize * 2.0f,
				zPos);

			trans.setOrigin(pos);
			btScalar mass = 1.f;

			btRigidBody* body = 0;
			body = createRigidBody(mass,trans,boxShape);

		}
	}
}


////////////////////////////////////

extern int gNumManifold;
extern int gOverlappingPairs;

///for mouse picking
void pickingPreTickCallback (btDynamicsWorld *world, btScalar timeStep)
{
	SoftDemo* softDemo = (SoftDemo*)world->getWorldUserInfo();

	if(softDemo->m_drag)
	{
		const int				x=softDemo->m_lastmousepos[0];
		const int				y=softDemo->m_lastmousepos[1];
		float rf[3];
		softDemo->getGUIHelper()->getRenderInterface()->getActiveCamera()->getCameraPosition(rf);
		float target[3];
		softDemo->getGUIHelper()->getRenderInterface()->getActiveCamera()->getCameraTargetPosition(target);
		btVector3 cameraTargetPosition(target[0],target[1],target[2]);
		
		const btVector3			cameraPosition(rf[0],rf[1],rf[2]);
		const btVector3			rayFrom=cameraPosition;

		const btVector3			rayTo=softDemo->getRayTo(x,y);
		const btVector3			rayDir=(rayTo-rayFrom).normalized();
		const btVector3			N=(cameraTargetPosition-cameraPosition).normalized();
		const btScalar			O=btDot(softDemo->m_impact,N);
		const btScalar			den=btDot(N,rayDir);
		if((den*den)>0)
		{
			const btScalar			num=O-btDot(N,rayFrom);
			const btScalar			hit=num/den;
			if((hit>0)&&(hit<1500))
			{				
				softDemo->m_goal=rayFrom+rayDir*hit;
			}				
		}		
		btVector3				delta=softDemo->m_goal-softDemo->m_node->m_x;
		static const btScalar	maxdrag=10;
		if(delta.length2()>(maxdrag*maxdrag))
		{
			delta=delta.normalized()*maxdrag;
		}
		softDemo->m_node->m_v+=delta/timeStep;
	}

}





//
// ImplicitShape
//

//
struct	ImplicitSphere : btSoftBody::ImplicitFn
{
	btVector3	center;
	btScalar	sqradius;
	ImplicitSphere() {}
	ImplicitSphere(const btVector3& c,btScalar r) : center(c),sqradius(r*r) {}
	btScalar	Eval(const btVector3& x)
	{
		return((x-center).length2()-sqradius);
	}
};

//
// Tetra meshes
//

struct	TetraBunny
{
#include "bunny.inl"
};

struct	TetraCube
{
#include "cube.inl"
};


//
// Random
//

static inline btScalar	UnitRand()
{
	return(rand()/(btScalar)RAND_MAX);
}

static inline btScalar	SignedUnitRand()
{
	return(UnitRand()*2-1);
}

static inline btVector3	Vector3Rand()
{
	const btVector3	p=btVector3(SignedUnitRand(),SignedUnitRand(),SignedUnitRand());
	return(p.normalized());
}

//
// Rb rain
//
static void	Ctor_RbUpStack(SoftDemo* pdemo,int count)
{
	float				mass=10;

	btCompoundShape* cylinderCompound = new btCompoundShape;
	btCollisionShape* cylinderShape = new btCylinderShapeX(btVector3(4,1,1));
	btCollisionShape* boxShape = new btBoxShape(btVector3(4,1,1));
	btTransform localTransform;
	localTransform.setIdentity();
	cylinderCompound->addChildShape(localTransform,boxShape);
	btQuaternion orn(SIMD_HALF_PI,0,0);
	localTransform.setRotation(orn);
	//	localTransform.setOrigin(btVector3(1,1,1));
	cylinderCompound->addChildShape(localTransform,cylinderShape);


	btCollisionShape*	shape[]={cylinderCompound,
		new btBoxShape(btVector3(1,1,1)),
		new btSphereShape(1.5)
		
	};
	static const int	nshapes=sizeof(shape)/sizeof(shape[0]);
	for(int i=0;i<count;++i)
	{
		btTransform startTransform;
		startTransform.setIdentity();
		startTransform.setOrigin(btVector3(0,2+6*i,0));
		pdemo->createRigidBody(mass,startTransform,shape[i%nshapes]);
		//pdemo->createRigidBody(mass,startTransform,shape[0]);
	}
}

//
// Big ball
//
static void	Ctor_BigBall(SoftDemo* pdemo,btScalar mass=10)
{
	btTransform startTransform;
	startTransform.setIdentity();
	startTransform.setOrigin(btVector3(0,13,0));
	pdemo->createRigidBody(mass,startTransform,new btSphereShape(3));
}

//
// Big plate
//
static btRigidBody*	Ctor_BigPlate(SoftDemo* pdemo,btScalar mass=15,btScalar height=4)
{
	btTransform startTransform;
	startTransform.setIdentity();
	startTransform.setOrigin(btVector3(0,height,0.5));
	btRigidBody*		body=pdemo->createRigidBody(mass,startTransform,new btBoxShape(btVector3(5,1,5)));
	body->setFriction(1);
	return(body);
}

//
// Linear stair
//
static void Ctor_LinearStair(SoftDemo* pdemo,const btVector3& org,const btVector3& sizes,btScalar angle,int count)
{
	btBoxShape*	shape=new btBoxShape(sizes);
	for(int i=0;i<count;++i)
	{
		btTransform startTransform;
		startTransform.setIdentity();
		startTransform.setOrigin(org+btVector3(sizes.x()*i*2,sizes.y()*i*2,0));
		btRigidBody* body=pdemo->createRigidBody(0,startTransform,shape);
		body->setFriction(1);
	}
}

//
// Softbox
//
static btSoftBody* Ctor_SoftBox(SoftDemo* pdemo,const btVector3& p,const btVector3& s)
{
	const btVector3	h=s*0.5;
	const btVector3	c[]={	p+h*btVector3(-1,-1,-1),
		p+h*btVector3(+1,-1,-1),
		p+h*btVector3(-1,+1,-1),
		p+h*btVector3(+1,+1,-1),
		p+h*btVector3(-1,-1,+1),
		p+h*btVector3(+1,-1,+1),
		p+h*btVector3(-1,+1,+1),
		p+h*btVector3(+1,+1,+1)};
	btSoftBody*		psb=btSoftBodyHelpers::CreateFromConvexHull(pdemo->m_softBodyWorldInfo,c,8);
	psb->generateBendingConstraints(2);
	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);

	return(psb);

}

//
// SoftBoulder
//
static btSoftBody* Ctor_SoftBoulder(SoftDemo* pdemo,const btVector3& p,const btVector3& s,int np,int id)
{
	btAlignedObjectArray<btVector3>	pts;
	if(id) srand(id);
	for(int i=0;i<np;++i)
	{
		pts.push_back(Vector3Rand()*s+p);
	}
	btSoftBody*		psb=btSoftBodyHelpers::CreateFromConvexHull(pdemo->m_softBodyWorldInfo,&pts[0],pts.size());
	psb->generateBendingConstraints(2);
	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);

	return(psb);
}

//#define TRACEDEMO { pdemo->demoname=__FUNCTION__+5;printf("Launching demo: " __FUNCTION__ "\r\n"); }

//
// Basic ropes
//
static void	Init_Ropes(SoftDemo* pdemo)
{
	//TRACEDEMO
	const int n=15;
	for(int i=0;i<n;++i)
	{
		btSoftBody*	psb=btSoftBodyHelpers::CreateRope(pdemo->m_softBodyWorldInfo,	btVector3(-10,0,i*0.25),
			btVector3(10,0,i*0.25),
			16,
			1+2);
		psb->m_cfg.piterations		=	4;
		psb->m_materials[0]->m_kLST	=	0.1+(i/(btScalar)(n-1))*0.9;
		psb->setTotalMass(20);
		pdemo->getSoftDynamicsWorld()->addSoftBody(psb);

	}
}

//
// Rope attach
//
static void	Init_RopeAttach(SoftDemo* pdemo)
{
	//TRACEDEMO
	pdemo->m_softBodyWorldInfo.m_sparsesdf.RemoveReferences(0);
	struct	Functors
	{
		static btSoftBody* CtorRope(SoftDemo* pdemo,const btVector3& p)
		{
			btSoftBody*	psb=btSoftBodyHelpers::CreateRope(pdemo->m_softBodyWorldInfo,p,p+btVector3(10,0,0),8,1);
			psb->setTotalMass(50);
			pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
			return(psb);
		}
	};
	btTransform startTransform;
	startTransform.setIdentity();
	startTransform.setOrigin(btVector3(12,8,0));
	btRigidBody*		body=pdemo->createRigidBody(50,startTransform,new btBoxShape(btVector3(2,6,2)));
	btSoftBody*	psb0=Functors::CtorRope(pdemo,btVector3(0,8,-1));
	btSoftBody*	psb1=Functors::CtorRope(pdemo,btVector3(0,8,+1));
	psb0->appendAnchor(psb0->m_nodes.size()-1,body);
	psb1->appendAnchor(psb1->m_nodes.size()-1,body);
}

//
// Cloth attach
//
static void	Init_ClothAttach(SoftDemo* pdemo)
{
	//TRACEDEMO
	const btScalar	s=4;
	const btScalar	h=6;
	const int		r=9;
	btSoftBody*		psb=btSoftBodyHelpers::CreatePatch(pdemo->m_softBodyWorldInfo,btVector3(-s,h,-s),
		btVector3(+s,h,-s),
		btVector3(-s,h,+s),
		btVector3(+s,h,+s),r,r,4+8,true);
	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);

	btTransform startTransform;
	startTransform.setIdentity();
	startTransform.setOrigin(btVector3(0,h,-(s+3.5)));
	btRigidBody*		body=pdemo->createRigidBody(20,startTransform,new btBoxShape(btVector3(s,1,3)));
	psb->appendAnchor(0,body);
	psb->appendAnchor(r-1,body);
	pdemo->m_cutting=true;
}

//
// Impact
//
static void	Init_Impact(SoftDemo* pdemo)
{
	//TRACEDEMO
	btSoftBody*	psb=btSoftBodyHelpers::CreateRope(pdemo->m_softBodyWorldInfo,	btVector3(0,0,0),
		btVector3(0,-1,0),
		0,
		1);
	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
	psb->m_cfg.kCHR=0.5;
	btTransform startTransform;
	startTransform.setIdentity();
	startTransform.setOrigin(btVector3(0,20,0));
	pdemo->createRigidBody(10,startTransform,new btBoxShape(btVector3(2,2,2)));
}

static void	Init_CapsuleCollision(SoftDemo* pdemo)
{
#ifdef USE_AMD_OPENCL
	btAlignedObjectArray<btSoftBody*> emptyArray;
	if (g_openCLSIMDSolver)
		g_openCLSIMDSolver->optimize(emptyArray);
#endif //USE_AMD_OPENCL

		//TRACEDEMO
	const btScalar	s=4;
	const btScalar	h=6;
	const int		r=20;

	btTransform startTransform;
	startTransform.setIdentity();
	startTransform.setOrigin(btVector3(0,h-2,0));

	btCollisionShape* capsuleShape= new btCapsuleShapeX(1,5);
	capsuleShape->setMargin( 0.5 );

	//	capsule->setLocalScaling(btVector3(5,1,1));
//	btRigidBody*		body=pdemo->createRigidBody(20,startTransform,capsuleShape);
	btRigidBody*		body=pdemo->createRigidBody(0,startTransform,capsuleShape);
	body->setFriction( 0.8f );

	int fixed=0;//4+8;
	btSoftBody*		psb=btSoftBodyHelpers::CreatePatch(pdemo->m_softBodyWorldInfo,btVector3(-s,h,-s),
		btVector3(+s,h,-s),
		btVector3(-s,h,+s),
		btVector3(+s,h,+s),r,r,fixed,true);
	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
	psb->setTotalMass(0.1);

	psb->m_cfg.piterations = 10;
	psb->m_cfg.citerations = 10;
	psb->m_cfg.diterations = 10;
//	psb->m_cfg.viterations = 10;


	//	psb->appendAnchor(0,body);
//	psb->appendAnchor(r-1,body);
//	pdemo->m_cutting=true;
}

//
// Collide
//
static void	Init_Collide(SoftDemo* pdemo)
{
	//TRACEDEMO
	struct Functor
	{
		static btSoftBody* Create(SoftDemo* pdemo,const btVector3& x,const btVector3& a)
		{
			btSoftBody*	psb=btSoftBodyHelpers::CreateFromTriMesh(pdemo->m_softBodyWorldInfo,gVertices,
				&gIndices[0][0],
				NUM_TRIANGLES);
			psb->generateBendingConstraints(2);
			psb->m_cfg.piterations=2;
			psb->m_cfg.collisions|=btSoftBody::fCollision::VF_SS;
			psb->randomizeConstraints();
			btMatrix3x3	m;
			m.setEulerZYX(a.x(),a.y(),a.z());
			psb->transform(btTransform(m,x));
			psb->scale(btVector3(2,2,2));
			psb->setTotalMass(50,true);
			pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
			return(psb);
		}
	};
	for(int i=0;i<3;++i)
	{
		Functor::Create(pdemo,btVector3(3*i,2,0),btVector3(SIMD_PI/2*(1-(i&1)),SIMD_PI/2*(i&1),0));
	}
	pdemo->m_cutting=true;
}

//
// Collide2
//
static void	Init_Collide2(SoftDemo* pdemo)
{
	//TRACEDEMO
	struct Functor
	{
		static btSoftBody* Create(SoftDemo* pdemo,const btVector3& x,const btVector3& a)
		{
			btSoftBody*	psb=btSoftBodyHelpers::CreateFromTriMesh(pdemo->m_softBodyWorldInfo,gVerticesBunny,
				&gIndicesBunny[0][0],
				BUNNY_NUM_TRIANGLES);
			btSoftBody::Material*	pm=psb->appendMaterial();
			pm->m_kLST				=	0.5;
			pm->m_flags				-=	btSoftBody::fMaterial::DebugDraw;
			psb->generateBendingConstraints(2,pm);
			psb->m_cfg.piterations	=	2;
			psb->m_cfg.kDF			=	0.5;
			psb->m_cfg.collisions	|=	btSoftBody::fCollision::VF_SS;
			psb->randomizeConstraints();
			btMatrix3x3	m;
			m.setEulerZYX(a.x(),a.y(),a.z());
			psb->transform(btTransform(m,x));
			psb->scale(btVector3(6,6,6));
			psb->setTotalMass(100,true);
			pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
			return(psb);
		}
	};
	for(int i=0;i<3;++i)
	{
		Functor::Create(pdemo,btVector3(0,-1+5*i,0),btVector3(0,SIMD_PI/2*(i&1),0));
	}	
	pdemo->m_cutting=true;
}

//
// Collide3
//
static void	Init_Collide3(SoftDemo* pdemo)
{
	//TRACEDEMO
	{
		const btScalar	s=8;
		btSoftBody*		psb=btSoftBodyHelpers::CreatePatch(	pdemo->m_softBodyWorldInfo,btVector3(-s,0,-s),
			btVector3(+s,0,-s),
			btVector3(-s,0,+s),
			btVector3(+s,0,+s),
			15,15,1+2+4+8,true);
		psb->m_materials[0]->m_kLST	=	0.4;
		psb->m_cfg.collisions		|=	btSoftBody::fCollision::VF_SS;
		psb->setTotalMass(150);
		pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
	}
	{		
		const btScalar	s=4;
		const btVector3	o=btVector3(5,10,0);
		btSoftBody*		psb=btSoftBodyHelpers::CreatePatch(	pdemo->m_softBodyWorldInfo,
			btVector3(-s,0,-s)+o,
			btVector3(+s,0,-s)+o,
			btVector3(-s,0,+s)+o,
			btVector3(+s,0,+s)+o,
			7,7,0,true);
		btSoftBody::Material*	pm=psb->appendMaterial();
		pm->m_kLST				=	0.1;
		pm->m_flags				-=	btSoftBody::fMaterial::DebugDraw;
		psb->generateBendingConstraints(2,pm);
		psb->m_materials[0]->m_kLST	=	0.5;
		psb->m_cfg.collisions		|=	btSoftBody::fCollision::VF_SS;
		psb->setTotalMass(150);
		pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
		pdemo->m_cutting=true;
	}
}

//
// Aerodynamic forces, 50x1g flyers
//
static void	Init_Aero(SoftDemo* pdemo)
{
	//TRACEDEMO
	const btScalar	s=2;
	const btScalar	h=10;
	const int		segments=6;
	const int		count=50;
	for(int i=0;i<count;++i)
	{
		btSoftBody*		psb=btSoftBodyHelpers::CreatePatch(pdemo->m_softBodyWorldInfo,btVector3(-s,h,-s),
			btVector3(+s,h,-s),
			btVector3(-s,h,+s),
			btVector3(+s,h,+s),
			segments,segments,
			0,true);
		btSoftBody::Material*	pm=psb->appendMaterial();
		pm->m_flags				-=	btSoftBody::fMaterial::DebugDraw;
		psb->generateBendingConstraints(2,pm);
		psb->m_cfg.kLF			=	0.004;
		psb->m_cfg.kDG			=	0.0003;
		psb->m_cfg.aeromodel	=	btSoftBody::eAeroModel::V_TwoSided;
		btTransform		trs;
		btQuaternion	rot;
		btVector3		ra=Vector3Rand()*0.1;
		btVector3		rp=Vector3Rand()*15+btVector3(0,20,80);
		rot.setEuler(SIMD_PI/8+ra.x(),-SIMD_PI/7+ra.y(),ra.z());
		trs.setIdentity();
		trs.setOrigin(rp);
		trs.setRotation(rot);
		psb->transform(trs);
		psb->setTotalMass(0.1);
		psb->addForce(btVector3(0,2,0),0);
		pdemo->getSoftDynamicsWorld()->addSoftBody(psb);

	}
	pdemo->m_autocam=true;
}

static void	Init_Aero2(SoftDemo* pdemo)
{
	//TRACEDEMO
	const btScalar	s=5;
	//psb->getWorldInfo()->m_gravity.setValue(0,0,0);

	const int		segments=10;
	const int		count=5;
	btVector3 pos(-s*segments, 0, 0);
	btScalar gap = 0.5;
	
	for(int i=0;i<count;++i)
	{
		btSoftBody*		psb=btSoftBodyHelpers::CreatePatch(	pdemo->m_softBodyWorldInfo,btVector3(-s,0,-s*3),
			btVector3(+s,0,-s*3),
			btVector3(-s,0,+s),
			btVector3(+s,0,+s),
			segments,segments*3,
			1+2,true);
		
		psb->getCollisionShape()->setMargin(0.5);
		btSoftBody::Material* pm=psb->appendMaterial();
		pm->m_kLST		=	0.0004;
		pm->m_flags		-=	btSoftBody::fMaterial::DebugDraw;
		psb->generateBendingConstraints(2,pm);
		
		psb->m_cfg.kLF			=	0.05;
		psb->m_cfg.kDG			=	0.01;

		//psb->m_cfg.kLF			=	0.004;
		//psb->m_cfg.kDG			=	0.0003;

		psb->m_cfg.piterations = 2;
		psb->m_cfg.aeromodel	=	btSoftBody::eAeroModel::V_TwoSidedLiftDrag;

		
		psb->setWindVelocity(btVector3(4, -12.0, -25.0));

		btTransform		trs;
		btQuaternion	rot;
		pos += btVector3(s*2 + gap, 0, 0);
		rot.setRotation(btVector3(1, 0, 0), btScalar(SIMD_PI/2));
		trs.setIdentity();
		trs.setOrigin(pos);
		trs.setRotation(rot);
		psb->transform(trs);
		psb->setTotalMass(2.0);
	
		

		//this could help performance in some cases
		btSoftBodyHelpers::ReoptimizeLinkOrder(psb);

		pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
	}

	pdemo->m_autocam=true;
}

//
// Friction
//
static void	Init_Friction(SoftDemo* pdemo)
{
	//TRACEDEMO
	const btScalar	bs=2;
	const btScalar	ts=bs+bs/4;
	for(int i=0,ni=20;i<ni;++i)
	{
		const btVector3	p(-ni*ts/2+i*ts,-10+bs,40);
		btSoftBody*		psb=Ctor_SoftBox(pdemo,p,btVector3(bs,bs,bs));
		psb->m_cfg.kDF	=	0.1 * ((i+1)/(btScalar)ni);
		psb->addVelocity(btVector3(0,0,-10));
	}
}

//
// Pressure
//
static void	Init_Pressure(SoftDemo* pdemo)
{
	//TRACEDEMO
	btSoftBody*	psb=btSoftBodyHelpers::CreateEllipsoid(pdemo->m_softBodyWorldInfo,btVector3(35,25,0),
		btVector3(1,1,1)*3,
		512);
	psb->m_materials[0]->m_kLST	=	0.1;
	psb->m_cfg.kDF				=	1;
	psb->m_cfg.kDP				=	0.001; // fun factor...
	psb->m_cfg.kPR				=	2500;
	psb->setTotalMass(30,true);
	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);

	Ctor_BigPlate(pdemo);
	Ctor_LinearStair(pdemo,btVector3(0,0,0),btVector3(2,1,5),0,10);
	pdemo->m_autocam=true;

}

//
// Volume conservation
//
static void	Init_Volume(SoftDemo* pdemo)
{
	//TRACEDEMO
	btSoftBody*	psb=btSoftBodyHelpers::CreateEllipsoid(pdemo->m_softBodyWorldInfo,btVector3(35,25,0),
		btVector3(1,1,1)*3,
		512);
	psb->m_materials[0]->m_kLST	=	0.45;
	psb->m_cfg.kVC				=	20;
	psb->setTotalMass(50,true);
	psb->setPose(true,false);
	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);

	Ctor_BigPlate(pdemo);
	Ctor_LinearStair(pdemo,btVector3(0,0,0),btVector3(2,1,5),0,10);
	pdemo->m_autocam=true;

}

//
// Stick+Bending+Rb's
//
static void	Init_Sticks(SoftDemo* pdemo)
{
	//TRACEDEMO
	const int		n=16;
	const int		sg=4;
	const btScalar	sz=5;
	const btScalar	hg=4;
	const btScalar	in=1/(btScalar)(n-1);
	for(int y=0;y<n;++y)
	{
		for(int x=0;x<n;++x)
		{
			const btVector3	org(-sz+sz*2*x*in,
				-10,
				-sz+sz*2*y*in);
			btSoftBody*		psb=btSoftBodyHelpers::CreateRope(	pdemo->m_softBodyWorldInfo,	org,
				org+btVector3(hg*0.001,hg,0),
				sg,
				1);
			psb->m_cfg.kDP		=	0.005;
			psb->m_cfg.kCHR		=	0.1;
			for(int i=0;i<3;++i)
			{
				psb->generateBendingConstraints(2+i);
			}
			psb->setMass(1,0);
			psb->setTotalMass(0.01);
			pdemo->getSoftDynamicsWorld()->addSoftBody(psb);

		}
	}
	Ctor_BigBall(pdemo);
}

//
// Bending
//
static void	Init_Bending(SoftDemo* pdemo)
{
	//TRACEDEMO
	const btScalar	s=4;
	const btVector3	x[]={	btVector3(-s,0,-s),
		btVector3(+s,0,-s),
		btVector3(+s,0,+s),
		btVector3(-s,0,+s)};
	const btScalar	m[]={	0,0,0,1};
	btSoftBody*		psb=new btSoftBody(&pdemo->m_softBodyWorldInfo,4,x,m);
	psb->appendLink(0,1);
	psb->appendLink(1,2);
	psb->appendLink(2,3);
	psb->appendLink(3,0);
	psb->appendLink(0,2);

	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
}

//
// 100kg cloth locked at corners, 10 falling 10kg rb's.
//
static void	Init_Cloth(SoftDemo* pdemo)
{
	//TRACEDEMO
	const btScalar	s=8;
	btSoftBody*		psb=btSoftBodyHelpers::CreatePatch(	pdemo->m_softBodyWorldInfo,btVector3(-s,0,-s),
		btVector3(+s,0,-s),
		btVector3(-s,0,+s),
		btVector3(+s,0,+s),
		31,31,
		//		31,31,
		1+2+4+8,true);
	
	psb->getCollisionShape()->setMargin(0.5);
	btSoftBody::Material* pm=psb->appendMaterial();
	pm->m_kLST		=	0.4;
	pm->m_flags		-=	btSoftBody::fMaterial::DebugDraw;
	psb->generateBendingConstraints(2,pm);
	psb->setTotalMass(150);
	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);

	Ctor_RbUpStack(pdemo,10);
	pdemo->m_cutting=true;
}

//
// 100kg Stanford's bunny
//
static void	Init_Bunny(SoftDemo* pdemo)
{
	//TRACEDEMO
	btSoftBody*	psb=btSoftBodyHelpers::CreateFromTriMesh(pdemo->m_softBodyWorldInfo,gVerticesBunny,
		&gIndicesBunny[0][0],
		BUNNY_NUM_TRIANGLES);
	btSoftBody::Material*	pm=psb->appendMaterial();
	pm->m_kLST				=	0.5;
	pm->m_flags				-=	btSoftBody::fMaterial::DebugDraw;
	psb->generateBendingConstraints(2,pm);
	psb->m_cfg.piterations	=	2;
	psb->m_cfg.kDF			=	0.5;
	psb->randomizeConstraints();
	psb->scale(btVector3(6,6,6));
	psb->setTotalMass(100,true);	
	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
	pdemo->m_cutting=true;

}

//
// 100kg Stanford's bunny with pose matching
//
static void	Init_BunnyMatch(SoftDemo* pdemo)
{
	//TRACEDEMO
	btSoftBody*	psb=btSoftBodyHelpers::CreateFromTriMesh(pdemo->m_softBodyWorldInfo,	gVerticesBunny,
		&gIndicesBunny[0][0],
		BUNNY_NUM_TRIANGLES);
	psb->m_cfg.kDF				=	0.5;
	psb->m_cfg.kMT				=	0.05;
	psb->m_cfg.piterations		=	5;
	psb->randomizeConstraints();
	psb->scale(btVector3(6,6,6));
	psb->setTotalMass(100,true);
	psb->setPose(false,true);
	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);	

}

//
// 50Kg Torus
//
static void	Init_Torus(SoftDemo* pdemo)
{
	//TRACEDEMO
	btSoftBody*	psb=btSoftBodyHelpers::CreateFromTriMesh(	pdemo->m_softBodyWorldInfo,	gVertices,
		&gIndices[0][0],
		NUM_TRIANGLES);
	psb->generateBendingConstraints(2);
	psb->m_cfg.piterations=2;
	psb->randomizeConstraints();
	btMatrix3x3	m;
	m.setEulerZYX(SIMD_PI/2,0,0);
	psb->transform(btTransform(m,btVector3(0,4,0)));
	psb->scale(btVector3(2,2,2));
	psb->setTotalMass(50,true);
	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
	pdemo->m_cutting=true;
	

}

//
// 50Kg Torus with pose matching
//
static void	Init_TorusMatch(SoftDemo* pdemo)
{
	//TRACEDEMO
	btSoftBody*	psb=btSoftBodyHelpers::CreateFromTriMesh(pdemo->m_softBodyWorldInfo,	gVertices,
		&gIndices[0][0],
		NUM_TRIANGLES);
	psb->m_materials[0]->m_kLST	=	0.1;
	psb->m_cfg.kMT				=	0.05;
	psb->randomizeConstraints();
	btMatrix3x3	m;
	m.setEulerZYX(SIMD_PI/2,0,0);
	psb->transform(btTransform(m,btVector3(0,4,0)));
	psb->scale(btVector3(2,2,2));
	psb->setTotalMass(50,true);
	psb->setPose(false,true);
	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
}

//
// Cutting1
//
static void	Init_Cutting1(SoftDemo* pdemo)
{
	const btScalar	s=6;
	const btScalar	h=2;
	const int		r=16;	
	const btVector3	p[]={	btVector3(+s,h,-s),
		btVector3(-s,h,-s),
		btVector3(+s,h,+s),
		btVector3(-s,h,+s)};
	btSoftBody*	psb=btSoftBodyHelpers::CreatePatch(pdemo->m_softBodyWorldInfo,p[0],p[1],p[2],p[3],r,r,1+2+4+8,true);
	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
	psb->m_cfg.piterations=1;
	pdemo->m_cutting=true;	
}

//
// Clusters
//

//
static void			Ctor_Gear(SoftDemo* pdemo,const btVector3& pos,btScalar speed)
{
	btTransform startTransform;
	startTransform.setIdentity();
	startTransform.setOrigin(pos);
	btCompoundShape*	shape=new btCompoundShape();
#if 1
	shape->addChildShape(btTransform(btQuaternion(0,0,0)),new btBoxShape(btVector3(5,1,6)));
	shape->addChildShape(btTransform(btQuaternion(0,0,SIMD_HALF_PI)),new btBoxShape(btVector3(5,1,6)));
#else
	shape->addChildShape(btTransform(btQuaternion(0,0,0)),new btCylinderShapeZ(btVector3(5,1,7)));
	shape->addChildShape(btTransform(btQuaternion(0,0,SIMD_HALF_PI)),new btBoxShape(btVector3(4,1,8)));
#endif
	btRigidBody*		body=pdemo->createRigidBody(10,startTransform,shape);
	body->setFriction(1);
	btDynamicsWorld*	world=pdemo->getDynamicsWorld();
	btHingeConstraint*	hinge=new btHingeConstraint(*body,btTransform::getIdentity());
	if(speed!=0) hinge->enableAngularMotor(true,speed,3);
	world->addConstraint(hinge);
}

//
static btSoftBody*	Ctor_ClusterBunny(SoftDemo* pdemo,const btVector3& x,const btVector3& a)
{
	btSoftBody*	psb=btSoftBodyHelpers::CreateFromTriMesh(pdemo->m_softBodyWorldInfo,gVerticesBunny,&gIndicesBunny[0][0],BUNNY_NUM_TRIANGLES);
	btSoftBody::Material*	pm=psb->appendMaterial();
	pm->m_kLST				=	1;
	pm->m_flags				-=	btSoftBody::fMaterial::DebugDraw;
	psb->generateBendingConstraints(2,pm);
	psb->m_cfg.piterations	=	2;
	psb->m_cfg.kDF			=	1;
	psb->m_cfg.collisions	=	btSoftBody::fCollision::CL_SS+
		btSoftBody::fCollision::CL_RS;
	psb->randomizeConstraints();
	btMatrix3x3	m;
	m.setEulerZYX(a.x(),a.y(),a.z());
	psb->transform(btTransform(m,x));
	psb->scale(btVector3(8,8,8));
	psb->setTotalMass(150,true);
	psb->generateClusters(1);
	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
	return(psb);
}

//
static btSoftBody*	Ctor_ClusterTorus(SoftDemo* pdemo,const btVector3& x,const btVector3& a,const btVector3& s=btVector3(2,2,2))
{
	btSoftBody*	psb=btSoftBodyHelpers::CreateFromTriMesh(pdemo->m_softBodyWorldInfo,gVertices,&gIndices[0][0],NUM_TRIANGLES);
	btSoftBody::Material*	pm=psb->appendMaterial();
	pm->m_kLST				=	1;
	pm->m_flags				-=	btSoftBody::fMaterial::DebugDraw;			
	psb->generateBendingConstraints(2,pm);
	psb->m_cfg.piterations	=	2;
	psb->m_cfg.collisions	=	btSoftBody::fCollision::CL_SS+
		btSoftBody::fCollision::CL_RS;
	psb->randomizeConstraints();
	psb->scale(s);
	psb->rotate(btQuaternion(a[0],a[1],a[2]));
	psb->translate(x);
	psb->setTotalMass(50,true);
	psb->generateClusters(64);			
	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
	return(psb);
}

//
static struct MotorControl : btSoftBody::AJoint::IControl
{
	MotorControl()
	{
		goal=0;
		maxtorque=0;
	}
	btScalar	Speed(btSoftBody::AJoint*,btScalar current)
	{
		return(current+btMin(maxtorque,btMax(-maxtorque,goal-current)));
	}
	btScalar	goal;
	btScalar	maxtorque;
}	motorcontrol;

//
struct SteerControl : btSoftBody::AJoint::IControl
{
	SteerControl(btScalar s)
	{
		angle=0;
		sign=s;
	}
	void		Prepare(btSoftBody::AJoint* joint)
	{
		joint->m_refs[0][0]=btCos(angle*sign);
		joint->m_refs[0][2]=btSin(angle*sign);
	}
	btScalar	Speed(btSoftBody::AJoint* joint,btScalar current)
	{
		return(motorcontrol.Speed(joint,current));
	}
	btScalar	angle;
	btScalar	sign;
};

static SteerControl	steercontrol_f(+1);
static SteerControl	steercontrol_r(-1);

//
static void	Init_ClusterDeform(SoftDemo* pdemo)
{
	btSoftBody*		psb=Ctor_ClusterTorus(pdemo,btVector3(0,0,0),btVector3(SIMD_PI/2,0,SIMD_HALF_PI));
	psb->generateClusters(8);
	psb->m_cfg.kDF=1;
}

//
static void	Init_ClusterCollide1(SoftDemo* pdemo)
{
	const btScalar	s=8;
	btSoftBody*		psb=btSoftBodyHelpers::CreatePatch(	pdemo->m_softBodyWorldInfo,btVector3(-s,0,-s),
		btVector3(+s,0,-s),
		btVector3(-s,0,+s),
		btVector3(+s,0,+s),
		17,17,//9,9,//31,31,
		1+2+4+8,
		true);
	btSoftBody::Material* pm=psb->appendMaterial();
	pm->m_kLST		=	0.4;
	pm->m_flags		-=	btSoftBody::fMaterial::DebugDraw;
	psb->m_cfg.kDF	=	1;
	psb->m_cfg.kSRHR_CL		=	1;
	psb->m_cfg.kSR_SPLT_CL	=	0;
	psb->m_cfg.collisions	=	btSoftBody::fCollision::CL_SS+
		
		btSoftBody::fCollision::CL_RS;
	psb->generateBendingConstraints(2,pm);
		
	psb->getCollisionShape()->setMargin(0.05);
	psb->setTotalMass(50);
	
	///pass zero in generateClusters to create  cluster for each tetrahedron or triangle
	psb->generateClusters(0);
	//psb->generateClusters(64);

	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);

	Ctor_RbUpStack(pdemo,10);
}

//
static void	Init_ClusterCollide2(SoftDemo* pdemo)
{
	struct Functor
	{
		static btSoftBody* Create(SoftDemo* pdemo,const btVector3& x,const btVector3& a)
		{
			btSoftBody*	psb=btSoftBodyHelpers::CreateFromTriMesh(pdemo->m_softBodyWorldInfo,gVertices,
				&gIndices[0][0],
				NUM_TRIANGLES);
			btSoftBody::Material* pm=psb->appendMaterial();
			pm->m_flags		-=	btSoftBody::fMaterial::DebugDraw;
			psb->generateBendingConstraints(2,pm);
			psb->m_cfg.piterations=2;
			psb->m_cfg.kDF			=1;
			psb->m_cfg.kSSHR_CL		=1;
			psb->m_cfg.kSS_SPLT_CL	=0;
			psb->m_cfg.kSKHR_CL		=0.1f;
			psb->m_cfg.kSK_SPLT_CL	=1;
			psb->m_cfg.collisions=	btSoftBody::fCollision::CL_SS+
				btSoftBody::fCollision::CL_RS;		
			psb->randomizeConstraints();
			btMatrix3x3	m;
			m.setEulerZYX(a.x(),a.y(),a.z());
			psb->transform(btTransform(m,x));
			psb->scale(btVector3(2,2,2));
			psb->setTotalMass(50,true);
			psb->generateClusters(16);
			pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
			return(psb);
		}
	};
	for(int i=0;i<3;++i)
	{
		Functor::Create(pdemo,btVector3(3*i,2,0),btVector3(SIMD_PI/2*(1-(i&1)),SIMD_PI/2*(i&1),0));
	}
}

//
static void	Init_ClusterSocket(SoftDemo* pdemo)
{
	btSoftBody*		psb=Ctor_ClusterTorus(pdemo,btVector3(0,0,0),btVector3(SIMD_PI/2,0,SIMD_HALF_PI));
	btRigidBody*	prb=Ctor_BigPlate(pdemo,50,8);
	psb->m_cfg.kDF=1;
	btSoftBody::LJoint::Specs	lj;
	lj.position	=	btVector3(0,5,0);
	psb->appendLinearJoint(lj,prb);
}

//
static void	Init_ClusterHinge(SoftDemo* pdemo)
{
	btSoftBody*		psb=Ctor_ClusterTorus(pdemo,btVector3(0,0,0),btVector3(SIMD_PI/2,0,SIMD_HALF_PI));
	btRigidBody*	prb=Ctor_BigPlate(pdemo,50,8);
	psb->m_cfg.kDF=1;
	btSoftBody::AJoint::Specs	aj;
	aj.axis	=	btVector3(0,0,1);
	psb->appendAngularJoint(aj,prb);
}

//
static void	Init_ClusterCombine(SoftDemo* pdemo)
{
	const btVector3	sz(2,4,2);		
	btSoftBody*	psb0=Ctor_ClusterTorus(pdemo,btVector3(0,8,0),btVector3(SIMD_PI/2,0,SIMD_HALF_PI),sz);
	btSoftBody*	psb1=Ctor_ClusterTorus(pdemo,btVector3(0,8,10),btVector3(SIMD_PI/2,0,SIMD_HALF_PI),sz);
	btSoftBody*	psbs[]={psb0,psb1};
	for(int j=0;j<2;++j)
	{
		psbs[j]->m_cfg.kDF=1;
		psbs[j]->m_cfg.kDP=0;
		psbs[j]->m_cfg.piterations=1;
		psbs[j]->m_clusters[0]->m_matching	=	0.05;
		psbs[j]->m_clusters[0]->m_ndamping	=	0.05;
	}
	btSoftBody::AJoint::Specs	aj;
	aj.axis		=	btVector3(0,0,1);
	aj.icontrol	=	&motorcontrol;
	psb0->appendAngularJoint(aj,psb1);

	btSoftBody::LJoint::Specs	lj;
	lj.position	=	btVector3(0,8,5);
	psb0->appendLinearJoint(lj,psb1);
}

//
static void	Init_ClusterCar(SoftDemo* pdemo)
{
//	pdemo->setAzi(180);
	const btVector3		origin(100,80,0);
	const btQuaternion	orientation(-SIMD_PI/2,0,0);
	const btScalar	widthf=8;
	const btScalar	widthr=9;
	const btScalar	length=8;
	const btScalar	height=4;
	const btVector3	wheels[]=	{
		btVector3(+widthf,-height,+length),	// Front left
		btVector3(-widthf,-height,+length),	// Front right
		btVector3(+widthr,-height,-length),	// Rear left
		btVector3(-widthr,-height,-length),	// Rear right
	};
	btSoftBody*	pa=Ctor_ClusterBunny(pdemo,btVector3(0,0,0),btVector3(0,0,0));
	btSoftBody*	pfl=Ctor_ClusterTorus(pdemo,wheels[0],btVector3(0,0,SIMD_HALF_PI),btVector3(2,4,2));
	btSoftBody*	pfr=Ctor_ClusterTorus(pdemo,wheels[1],btVector3(0,0,SIMD_HALF_PI),btVector3(2,4,2));
	btSoftBody*	prl=Ctor_ClusterTorus(pdemo,wheels[2],btVector3(0,0,SIMD_HALF_PI),btVector3(2,5,2));
	btSoftBody*	prr=Ctor_ClusterTorus(pdemo,wheels[3],btVector3(0,0,SIMD_HALF_PI),btVector3(2,5,2));

	pfl->m_cfg.kDF	=
		pfr->m_cfg.kDF	=
		prl->m_cfg.kDF	=
		prr->m_cfg.kDF	=	1;

	btSoftBody::LJoint::Specs	lspecs;
	lspecs.cfm		=	1;
	lspecs.erp		=	1;
	lspecs.position	=	btVector3(0,0,0);

	lspecs.position=wheels[0];pa->appendLinearJoint(lspecs,pfl);
	lspecs.position=wheels[1];pa->appendLinearJoint(lspecs,pfr);
	lspecs.position=wheels[2];pa->appendLinearJoint(lspecs,prl);
	lspecs.position=wheels[3];pa->appendLinearJoint(lspecs,prr);

	btSoftBody::AJoint::Specs	aspecs;
	aspecs.cfm		=	1;
	aspecs.erp		=	1;
	aspecs.axis		=	btVector3(1,0,0);

	aspecs.icontrol	=	&steercontrol_f;
	pa->appendAngularJoint(aspecs,pfl);
	pa->appendAngularJoint(aspecs,pfr);

	aspecs.icontrol	=	&motorcontrol;
	pa->appendAngularJoint(aspecs,prl);
	pa->appendAngularJoint(aspecs,prr);

	pa->rotate(orientation);
	pfl->rotate(orientation);
	pfr->rotate(orientation);
	prl->rotate(orientation);
	prr->rotate(orientation);
	pa->translate(origin);
	pfl->translate(origin);
	pfr->translate(origin);
	prl->translate(origin);
	prr->translate(origin);
	pfl->m_cfg.piterations	=
		pfr->m_cfg.piterations	=
		prl->m_cfg.piterations	=
		prr->m_cfg.piterations	= 1;
	pfl->m_clusters[0]->m_matching	=
		pfr->m_clusters[0]->m_matching	=
		prl->m_clusters[0]->m_matching	=
		prr->m_clusters[0]->m_matching	= 0.05;
	pfl->m_clusters[0]->m_ndamping	=
		pfr->m_clusters[0]->m_ndamping	=
		prl->m_clusters[0]->m_ndamping	=
		prr->m_clusters[0]->m_ndamping	= 0.05;

	Ctor_LinearStair(pdemo,btVector3(0,-8,0),btVector3(3,2,40),0,20);
	Ctor_RbUpStack(pdemo,50);
	pdemo->m_autocam=true;

}

//
static void	Init_ClusterRobot(SoftDemo* pdemo)
{
	struct Functor
	{
		static btSoftBody*	CreateBall(SoftDemo* pdemo,const btVector3& pos)
		{
			btSoftBody*	psb=btSoftBodyHelpers::CreateEllipsoid(pdemo->m_softBodyWorldInfo,pos,btVector3(1,1,1)*3,512);
			psb->m_materials[0]->m_kLST	=	0.45;
			psb->m_cfg.kVC				=	20;
			psb->setTotalMass(50,true);
			psb->setPose(true,false);
			psb->generateClusters(1);
			pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
			return(psb);
		}
	};
	const btVector3		base=btVector3(0,25,8);
	btSoftBody*			psb0=Functor::CreateBall(pdemo,base+btVector3(-8,0,0));
	btSoftBody*			psb1=Functor::CreateBall(pdemo,base+btVector3(+8,0,0));
	btSoftBody*			psb2=Functor::CreateBall(pdemo,base+btVector3(0,0,+8*btSqrt(2)));
	const btVector3		ctr=(psb0->clusterCom(0)+psb1->clusterCom(0)+psb2->clusterCom(0))/3;
	btCylinderShape*	pshp=new btCylinderShape(btVector3(8,1,8));
	btRigidBody*		prb=pdemo->createRigidBody(50,btTransform(btQuaternion(0,0,0),ctr+btVector3(0,5,0)),pshp);
	btSoftBody::LJoint::Specs	ls;
	ls.erp=0.5f;
	ls.position=psb0->clusterCom(0);psb0->appendLinearJoint(ls,prb);
	ls.position=psb1->clusterCom(0);psb1->appendLinearJoint(ls,prb);
	ls.position=psb2->clusterCom(0);psb2->appendLinearJoint(ls,prb);

	btBoxShape*			pbox=new btBoxShape(btVector3(20,1,40));
	btRigidBody*		pgrn=pdemo->createRigidBody(0,btTransform(btQuaternion(0,-SIMD_HALF_PI/2,0),btVector3(0,0,0)),pbox);

	pdemo->m_autocam=true;

}

//
static void	Init_ClusterStackSoft(SoftDemo* pdemo)
{
	for(int i=0;i<10;++i)
	{
		btSoftBody*	psb=Ctor_ClusterTorus(pdemo,btVector3(0,-9+8.25*i,0),btVector3(0,0,0));
		psb->m_cfg.kDF=1;
	}
}

//
static void	Init_ClusterStackMixed(SoftDemo* pdemo)
{
	for(int i=0;i<10;++i)
	{
		if((i+1)&1)
		{
			Ctor_BigPlate(pdemo,50,-9+4.25*i);
		}
		else
		{
			btSoftBody*	psb=Ctor_ClusterTorus(pdemo,btVector3(0,-9+4.25*i,0),btVector3(0,0,0));
			psb->m_cfg.kDF=1;
		}
	}
}


//
// TetraBunny
//
static void	Init_TetraBunny(SoftDemo* pdemo)
{
	btSoftBody* psb=btSoftBodyHelpers::CreateFromTetGenData(pdemo->m_softBodyWorldInfo,
															TetraBunny::getElements(),
															0,
															TetraBunny::getNodes(),
															false,true,true);
	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
	psb->rotate(btQuaternion(SIMD_PI/2,0,0));
	psb->setVolumeMass(150);
	psb->m_cfg.piterations=2;
	//psb->m_cfg.piterations=1;
	pdemo->m_cutting=false;	
	//psb->getCollisionShape()->setMargin(0.01);
	psb->m_cfg.collisions	=	btSoftBody::fCollision::CL_SS+	btSoftBody::fCollision::CL_RS
		//+ btSoftBody::fCollision::CL_SELF
		;

	///pass zero in generateClusters to create  cluster for each tetrahedron or triangle
	psb->generateClusters(0);
	//psb->m_materials[0]->m_kLST=.2;
	psb->m_cfg.kDF	=	10. ;
	

}

//
// TetraCube
//
static void	Init_TetraCube(SoftDemo* pdemo)
{
	btSoftBody* psb=btSoftBodyHelpers::CreateFromTetGenData(pdemo->m_softBodyWorldInfo,
															TetraCube::getElements(),
															0,
															TetraCube::getNodes(),
															false,true,true);
	pdemo->getSoftDynamicsWorld()->addSoftBody(psb);
	psb->scale(btVector3(4,4,4));
	psb->translate(btVector3(0,5,0));
	psb->setVolumeMass(300);
	
	
	///fix one vertex
	//psb->setMass(0,0);
	//psb->setMass(10,0);
	//psb->setMass(20,0);
	psb->m_cfg.piterations=1;
	//psb->generateClusters(128);
	psb->generateClusters(16);
	//psb->getCollisionShape()->setMargin(0.5);

	psb->getCollisionShape()->setMargin(0.01);
	psb->m_cfg.collisions	=	btSoftBody::fCollision::CL_SS+	btSoftBody::fCollision::CL_RS
		//+ btSoftBody::fCollision::CL_SELF
		;
	psb->m_materials[0]->m_kLST=0.8;
	pdemo->m_cutting=false;	
}





	/* Init		*/ 
	void (*demofncs[])(SoftDemo*)=
	{
		Init_Cloth,
		Init_Pressure,
		Init_Volume,
		Init_Ropes,
		Init_RopeAttach,
		Init_ClothAttach,
		Init_Sticks,
		Init_CapsuleCollision,
		Init_Collide,
		Init_Collide2,
		Init_Collide3,
		Init_Impact,
		Init_Aero,
		Init_Aero2,
		Init_Friction,			
		Init_Torus,
		Init_TorusMatch,
		Init_Bunny,
		Init_BunnyMatch,
		Init_Cutting1,
		Init_ClusterDeform,
		Init_ClusterCollide1,
		Init_ClusterCollide2,
		Init_ClusterSocket,
		Init_ClusterHinge,
		Init_ClusterCombine,
		Init_ClusterCar,
		Init_ClusterRobot,
		Init_ClusterStackSoft,
		Init_ClusterStackMixed,
		Init_TetraCube,
		Init_TetraBunny,
	};

#if 0
void	SoftDemo::clientResetScene()
{
	m_azi = 0;
	m_cameraDistance = 30.f;
	m_cameraTargetPosition.setValue(0,0,0);

	
	/* Clean up	*/ 
	for(int i=m_dynamicsWorld->getNumCollisionObjects()-1;i>=0;i--)
	{
		btCollisionObject*	obj=m_dynamicsWorld->getCollisionObjectArray()[i];
		btRigidBody*		body=btRigidBody::upcast(obj);
		if(body&&body->getMotionState())
		{
			delete body->getMotionState();
		}
		while(m_dynamicsWorld->getNumConstraints())
		{
			btTypedConstraint*	pc=m_dynamicsWorld->getConstraint(0);
			m_dynamicsWorld->removeConstraint(pc);
			delete pc;
		}
		btSoftBody* softBody = btSoftBody::upcast(obj);
		if (softBody)
		{
			getSoftDynamicsWorld()->removeSoftBody(softBody);
		} else
		{
			btRigidBody* body = btRigidBody::upcast(obj);
			if (body)
				m_dynamicsWorld->removeRigidBody(body);
			else
				m_dynamicsWorld->removeCollisionObject(obj);
		}
		delete obj;
	}


	
}

#if 0
void SoftDemo::clientMoveAndDisplay()
{
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT|GL_STENCIL_BUFFER_BIT); 




	float ms = getDeltaTimeMicroseconds();
	float dt = ms / 1000000.f;//1.0/60.;	



	if (m_dynamicsWorld)
	{
		
		if (sDemoMode)
		{
			static float demoCounter = DEMO_MODE_TIMEOUT;
			demoCounter-= dt;
			if (demoCounter<0)
			{
				
				demoCounter=DEMO_MODE_TIMEOUT;
				current_demo++;
				current_demo=current_demo%(sizeof(demofncs)/sizeof(demofncs[0]));
				clientResetScene();
			}
		}
		

//#define FIXED_STEP
#ifdef FIXED_STEP
		m_dynamicsWorld->stepSimulation(dt=1.0f/60.f,0);

#else
		//during idle mode, just run 1 simulation step maximum, otherwise 4 at max
	//	int maxSimSubSteps = m_idle ? 1 : 4;
		//if (m_idle)
		//	dt = 1.0/420.f;

		int numSimSteps;
		numSimSteps = m_dynamicsWorld->stepSimulation(dt);
		//numSimSteps = m_dynamicsWorld->stepSimulation(dt,10,1./240.f);

#ifdef VERBOSE_TIMESTEPPING_CONSOLEOUTPUT
		if (!numSimSteps)
			printf("Interpolated transforms\n");
		else
		{
			if (numSimSteps > maxSimSubSteps)
			{
				//detect dropping frames
				printf("Dropped (%i) simulation steps out of %i\n",numSimSteps - maxSimSubSteps,numSimSteps);
			} else
			{
				printf("Simulated (%i) steps\n",numSimSteps);
			}
		}
#endif //VERBOSE_TIMESTEPPING_CONSOLEOUTPUT

#endif		

#ifdef USE_AMD_OPENCL
		if (g_openCLSIMDSolver)
			g_openCLSIMDSolver->copyBackToSoftBodies();
#endif //USE_AMD_OPENCL

		if(m_drag)
		{
			m_node->m_v*=0;
		}

		m_softBodyWorldInfo.m_sparsesdf.GarbageCollect();

		//optional but useful: debug drawing

	}

#ifdef USE_QUICKPROF 
	btProfiler::beginBlock("render"); 
#endif //USE_QUICKPROF 

	renderme(); 

	//render the graphics objects, with center of mass shift

	updateCamera();



#ifdef USE_QUICKPROF 
	btProfiler::endBlock("render"); 
#endif 
	glFlush();
	//some additional debugging info
#ifdef PRINT_CONTACT_STATISTICS
	printf("num manifolds: %i\n",gNumManifold);
	printf("num gOverlappingPairs: %i\n",gOverlappingPairs);
	
#endif //PRINT_CONTACT_STATISTICS


	swapBuffers();

}
#endif


#if 0
void	SoftDemo::renderme()
{
	btIDebugDraw*	idraw=m_dynamicsWorld->getDebugDrawer();

	glDisable(GL_TEXTURE_2D);
	glDisable(GL_LIGHTING);
	m_dynamicsWorld->debugDrawWorld();

	//int debugMode = m_dynamicsWorld->getDebugDrawer()? m_dynamicsWorld->getDebugDrawer()->getDebugMode() : -1;

	btSoftRigidDynamicsWorld* softWorld = (btSoftRigidDynamicsWorld*)m_dynamicsWorld;
	//btIDebugDraw*	sdraw = softWorld ->getDebugDrawer();


	for (  int i=0;i<softWorld->getSoftBodyArray().size();i++)
	{
		btSoftBody*	psb=(btSoftBody*)softWorld->getSoftBodyArray()[i];
		if (softWorld->getDebugDrawer() && !(softWorld->getDebugDrawer()->getDebugMode() & (btIDebugDraw::DBG_DrawWireframe)))
		{
			btSoftBodyHelpers::DrawFrame(psb,softWorld->getDebugDrawer());
			btSoftBodyHelpers::Draw(psb,softWorld->getDebugDrawer(),softWorld->getDrawFlags());
		}
	}

	/* Bodies		*/ 
	btVector3	ps(0,0,0);
	int			nps=0;

	btSoftBodyArray&	sbs=getSoftDynamicsWorld()->getSoftBodyArray();
	for(int ib=0;ib<sbs.size();++ib)
	{
		btSoftBody*	psb=sbs[ib];
		nps+=psb->m_nodes.size();
		for(int i=0;i<psb->m_nodes.size();++i)
		{
			ps+=psb->m_nodes[i].m_x;
		}		
	}
	ps/=nps;
	if(m_autocam)
		m_cameraTargetPosition+=(ps-m_cameraTargetPosition)*0.05;
	/* Anm			*/ 
	if(!isIdle())
		m_animtime=m_clock.getTimeMilliseconds()/1000.f;
	/* Ray cast		*/ 
	if(m_raycast)
	{		
		/* Prepare rays	*/ 
		const int		res=64;
		const btScalar	fres=res-1;
		const btScalar	size=8;
		const btScalar	dist=10;
		btTransform		trs;
		trs.setOrigin(ps);
		btScalar rayLength = 1000.f;

		const btScalar	angle=m_animtime*0.2;
		trs.setRotation(btQuaternion(angle,SIMD_PI/4,0));
		btVector3	dir=trs.getBasis()*btVector3(0,-1,0);
		trs.setOrigin(ps-dir*dist);
		btAlignedObjectArray<btVector3>	origins;
		btAlignedObjectArray<btScalar>	fractions;
		origins.resize(res*res);
		fractions.resize(res*res,1.f);
		for(int y=0;y<res;++y)
		{
			for(int x=0;x<res;++x)
			{
				const int	idx=y*res+x;
				origins[idx]=trs*btVector3(-size+size*2*x/fres,dist,-size+size*2*y/fres);
			}
		}
		/* Cast rays	*/ 		
		{
			m_clock.reset();
			if (sbs.size())
			{
				btVector3*		org=&origins[0];
				btScalar*				fraction=&fractions[0];
				btSoftBody**			psbs=&sbs[0];
				btSoftBody::sRayCast	results;
				for(int i=0,ni=origins.size(),nb=sbs.size();i<ni;++i)
				{
					for(int ib=0;ib<nb;++ib)
					{
						btVector3 rayFrom = *org;
						btVector3 rayTo = rayFrom+dir*rayLength;
						if(psbs[ib]->rayTest(rayFrom,rayTo,results))
						{
							*fraction=results.fraction;
						}
					}
					++org;++fraction;
				}
				long	ms=btMax<long>(m_clock.getTimeMilliseconds(),1);
				long	rayperseconds=(1000*(origins.size()*sbs.size()))/ms;
				printf("%d ms (%d rays/s)\r\n",int(ms),int(rayperseconds));
			}
		}
		/* Draw rays	*/ 
		const btVector3	c[]={	origins[0],
			origins[res-1],
			origins[res*(res-1)],
			origins[res*(res-1)+res-1]};
		idraw->drawLine(c[0],c[1],btVector3(0,0,0));
		idraw->drawLine(c[1],c[3],btVector3(0,0,0));
		idraw->drawLine(c[3],c[2],btVector3(0,0,0));
		idraw->drawLine(c[2],c[0],btVector3(0,0,0));
		for(int i=0,ni=origins.size();i<ni;++i)
		{
			const btScalar		fraction=fractions[i];
			const btVector3&	org=origins[i];
			if(fraction<1.f)
			{
				idraw->drawLine(org,org+dir*rayLength*fraction,btVector3(1,0,0));
			}
			else
			{
				idraw->drawLine(org,org-dir*rayLength*0.1,btVector3(0,0,0));
			}
		}
#undef RES
	}
	/* Water level	*/ 
	static const btVector3	axis[]={btVector3(1,0,0),
		btVector3(0,1,0),
		btVector3(0,0,1)};
	if(m_softBodyWorldInfo.water_density>0)
	{
		const btVector3	c=	btVector3((btScalar)0.25,(btScalar)0.25,1);
		const btScalar	a=	(btScalar)0.5;
		const btVector3	n=	m_softBodyWorldInfo.water_normal;
		const btVector3	o=	-n*m_softBodyWorldInfo.water_offset;
		const btVector3	x=	btCross(n,axis[n.minAxis()]).normalized();
		const btVector3	y=	btCross(x,n).normalized();
		const btScalar	s=	25;
		idraw->drawTriangle(o-x*s-y*s,o+x*s-y*s,o+x*s+y*s,c,a);
		idraw->drawTriangle(o-x*s-y*s,o+x*s+y*s,o-x*s+y*s,c,a);
	}
	//

	int lineWidth=280;
	int xStart = m_glutScreenWidth - lineWidth;
	int yStart = 20;

	if((getDebugMode() & btIDebugDraw::DBG_NoHelpText)==0)
	{
		setOrthographicProjection();
		glDisable(GL_LIGHTING);
		glColor3f(0, 0, 0);
		char buf[124];
		
		glRasterPos3f(xStart, yStart, 0);
		if (sDemoMode)
		{		
			sprintf(buf,"d to toggle demo mode (on)");
		} else
		{
			sprintf(buf,"d to toggle demo mode (off)");
		}
		GLDebugDrawString(xStart,20,buf);
		glRasterPos3f(xStart, yStart, 0);
		sprintf(buf,"] for next demo (%d)",current_demo);
		yStart+=20;
		GLDebugDrawString(xStart,yStart,buf);
		glRasterPos3f(xStart, yStart, 0);
		sprintf(buf,"c to visualize clusters");
		yStart+=20;
		GLDebugDrawString(xStart,yStart,buf);
		glRasterPos3f(xStart, yStart, 0);
		sprintf(buf,"; to toggle camera mode");
		yStart+=20;
		GLDebugDrawString(xStart,yStart,buf);
		glRasterPos3f(xStart, yStart, 0);
        sprintf(buf,"n,m,l,k for power and steering");
		yStart+=20;
		GLDebugDrawString(xStart,yStart,buf);


		resetPerspectiveProjection();
		glEnable(GL_LIGHTING);
	}

	DemoApplication::renderme();

}
#endif
#endif

void	SoftDemo::setDrawClusters(bool drawClusters)
{
	if (drawClusters)
	{
		getSoftDynamicsWorld()->setDrawFlags(getSoftDynamicsWorld()->getDrawFlags()|fDrawFlags::Clusters);
	} else
	{
		getSoftDynamicsWorld()->setDrawFlags(getSoftDynamicsWorld()->getDrawFlags()& (~fDrawFlags::Clusters));
	}
}


#if 0
void	SoftDemo::keyboardCallback(unsigned char key, int x, int y)
{
	switch(key)
	{
	case    'd':	sDemoMode = !sDemoMode; break;
	case	'n':	motorcontrol.maxtorque=10;motorcontrol.goal+=1;break;
	case	'm':	motorcontrol.maxtorque=10;motorcontrol.goal-=1;break;
	case	'l':	steercontrol_f.angle+=0.1;steercontrol_r.angle+=0.1;break;
	case	'k':	steercontrol_f.angle-=0.1;steercontrol_r.angle-=0.1;break;
	case	']':	++current_demo;clientResetScene();break;
	case	'[':	--current_demo;clientResetScene();break;
	case	',':	m_raycast=!m_raycast;break;
	case	';':	m_autocam=!m_autocam;break;
	case	'c':	getSoftDynamicsWorld()->setDrawFlags(getSoftDynamicsWorld()->getDrawFlags()^fDrawFlags::Clusters);break;
	case	'`':
		{
			btSoftBodyArray&	sbs=getSoftDynamicsWorld()->getSoftBodyArray();
			for(int ib=0;ib<sbs.size();++ib)
			{
				btSoftBody*	psb=sbs[ib];
				psb->staticSolve(128);
			}
		}
		break;
	default:		DemoApplication::keyboardCallback(key,x,y);
	}
}
#endif
//
void	SoftDemo::mouseMotionFunc(int x,int y)
{
	if(m_node&&(m_results.fraction<1.f))
	{
		if(!m_drag)
		{
#define SQ(_x_) (_x_)*(_x_)
			if((SQ(x-m_lastmousepos[0])+SQ(y-m_lastmousepos[1]))>6)
			{
				m_drag=true;
			}
#undef SQ
		}
		if(m_drag)
		{
			m_lastmousepos[0]	=	x;
			m_lastmousepos[1]	=	y;		
		}
	}
}

#if 0
//
void	SoftDemo::mouseFunc(int button, int state, int x, int y)
{
	if(button==0)
	{
		switch(state)
		{
			case	0:
			{
				m_results.fraction=1.f;
				DemoApplication::mouseFunc(button,state,x,y);
				if(!m_pickConstraint)
				{
					const btVector3			rayFrom=m_cameraPosition;
					const btVector3			rayTo=getRayTo(x,y);
					const btVector3			rayDir=(rayTo-rayFrom).normalized();
					btSoftBodyArray&		sbs=getSoftDynamicsWorld()->getSoftBodyArray();
					for(int ib=0;ib<sbs.size();++ib)
					{
						btSoftBody*				psb=sbs[ib];
						btSoftBody::sRayCast	res;
						if(psb->rayTest(rayFrom,rayTo,res))
						{
							m_results=res;
						}
					}
					if(m_results.fraction<1.f)
					{				
						m_impact			=	rayFrom+(rayTo-rayFrom)*m_results.fraction;
						m_drag				=	m_cutting ? false : true;
						m_lastmousepos[0]	=	x;
						m_lastmousepos[1]	=	y;
						m_node				=	0;
						switch(m_results.feature)
						{
						case btSoftBody::eFeature::Tetra:
							{
								btSoftBody::Tetra&	tet=m_results.body->m_tetras[m_results.index];
								m_node=tet.m_n[0];
								for(int i=1;i<4;++i)
								{
									if(	(m_node->m_x-m_impact).length2()>
										(tet.m_n[i]->m_x-m_impact).length2())
									{
										m_node=tet.m_n[i];
									}
								}
								break;
							}
						case	btSoftBody::eFeature::Face:
							{
								btSoftBody::Face&	f=m_results.body->m_faces[m_results.index];
								m_node=f.m_n[0];
								for(int i=1;i<3;++i)
								{
									if(	(m_node->m_x-m_impact).length2()>
										(f.m_n[i]->m_x-m_impact).length2())
									{
										m_node=f.m_n[i];
									}
								}
							}
							break;
						}
						if(m_node) m_goal=m_node->m_x;
						return;
					}
				}
			}
			break;
		case	1:
			if((!m_drag)&&m_cutting&&(m_results.fraction<1.f))
			{
				ImplicitSphere	isphere(m_impact,1);
				printf("Mass before: %f\r\n",m_results.body->getTotalMass());
				m_results.body->refine(&isphere,0.0001,true);
				printf("Mass after: %f\r\n",m_results.body->getTotalMass());
			}
			m_results.fraction=1.f;
			m_drag=false;
			DemoApplication::mouseFunc(button,state,x,y);
			break;
		}
	}
	else
	{
		DemoApplication::mouseFunc(button,state,x,y);
	}
}
#endif

void	SoftDemo::initPhysics()
{
	///create concave ground mesh

	m_guiHelper->setUpAxis(1);
//	m_azi = 0;

	//reset and disable motorcontrol at the start
	motorcontrol.goal = 0;
	motorcontrol.maxtorque = 0;

	btCollisionShape* groundShape = 0;
	{
		int i;
		int j;

		const int NUM_VERTS_X = 30;
		const int NUM_VERTS_Y = 30;
		const int totalVerts = NUM_VERTS_X*NUM_VERTS_Y;
		const int totalTriangles = 2*(NUM_VERTS_X-1)*(NUM_VERTS_Y-1);

		gGroundVertices = new btVector3[totalVerts];
		gGroundIndices = new int[totalTriangles*3];

		btScalar offset(-50);

		for ( i=0;i<NUM_VERTS_X;i++)
		{
			for (j=0;j<NUM_VERTS_Y;j++)
			{
				gGroundVertices[i+j*NUM_VERTS_X].setValue((i-NUM_VERTS_X*0.5f)*TRIANGLE_SIZE,
					//0.f,
					waveheight*sinf((float)i)*cosf((float)j+offset),
					(j-NUM_VERTS_Y*0.5f)*TRIANGLE_SIZE);
			}
		}

		int vertStride = sizeof(btVector3);
		int indexStride = 3*sizeof(int);

		int index=0;
		for ( i=0;i<NUM_VERTS_X-1;i++)
		{
			for (int j=0;j<NUM_VERTS_Y-1;j++)
			{
				gGroundIndices[index++] = j*NUM_VERTS_X+i;
				gGroundIndices[index++] = j*NUM_VERTS_X+i+1;
				gGroundIndices[index++] = (j+1)*NUM_VERTS_X+i+1;

				gGroundIndices[index++] = j*NUM_VERTS_X+i;
				gGroundIndices[index++] = (j+1)*NUM_VERTS_X+i+1;
				gGroundIndices[index++] = (j+1)*NUM_VERTS_X+i;
			}
		}

		btTriangleIndexVertexArray* indexVertexArrays = new btTriangleIndexVertexArray(totalTriangles,
			gGroundIndices,
			indexStride,
			totalVerts,(btScalar*) &gGroundVertices[0].x(),vertStride);

		bool useQuantizedAabbCompression = true;

		groundShape = new btBvhTriangleMeshShape(indexVertexArrays,useQuantizedAabbCompression);
		groundShape->setMargin(0.5);
	}

	m_collisionShapes.push_back(groundShape);

	btCollisionShape* groundBox = new btBoxShape (btVector3(100,CUBE_HALF_EXTENTS,100));
	m_collisionShapes.push_back(groundBox);

	btCompoundShape* cylinderCompound = new btCompoundShape;
	btCollisionShape* cylinderShape = new btCylinderShape (btVector3(CUBE_HALF_EXTENTS,CUBE_HALF_EXTENTS,CUBE_HALF_EXTENTS));
	btTransform localTransform;
	localTransform.setIdentity();
	cylinderCompound->addChildShape(localTransform,cylinderShape);
	btQuaternion orn(btVector3(0,1,0),SIMD_PI);
	localTransform.setRotation(orn);
	cylinderCompound->addChildShape(localTransform,cylinderShape);

	m_collisionShapes.push_back(cylinderCompound);


	m_dispatcher=0;

	///register some softbody collision algorithms on top of the default btDefaultCollisionConfiguration
	m_collisionConfiguration = new btSoftBodyRigidBodyCollisionConfiguration();


	m_dispatcher = new	btCollisionDispatcher(m_collisionConfiguration);
	m_softBodyWorldInfo.m_dispatcher = m_dispatcher;

	////////////////////////////
	///Register softbody versus softbody collision algorithm


	///Register softbody versus rigidbody collision algorithm


	////////////////////////////

	btVector3 worldAabbMin(-1000,-1000,-1000);
	btVector3 worldAabbMax(1000,1000,1000);

	m_broadphase = new btAxisSweep3(worldAabbMin,worldAabbMax,maxProxies);

	m_softBodyWorldInfo.m_broadphase = m_broadphase;

	btSequentialImpulseConstraintSolver* solver = new btSequentialImpulseConstraintSolver();

	m_solver = solver;

	btSoftBodySolver* softBodySolver = 0;
#ifdef USE_AMD_OPENCL

	static bool once = true;
	if (once)
	{
		once=false;
		initCL(0,0);
	}

	if( g_openCLSIMDSolver  )
		delete g_openCLSIMDSolver;
	if( g_softBodyOutput )
		delete g_softBodyOutput;

	if (1)
	{
		g_openCLSIMDSolver = new btOpenCLSoftBodySolverSIMDAware( g_cqCommandQue, g_cxMainContext);
	//	g_openCLSIMDSolver = new btOpenCLSoftBodySolver( g_cqCommandQue, g_cxMainContext);
		g_openCLSIMDSolver->setCLFunctions(new CachingCLFunctions(g_cqCommandQue, g_cxMainContext));
	}	



	softBodySolver = g_openCLSIMDSolver;
	g_softBodyOutput = new btSoftBodySolverOutputCLtoCPU;
#endif //USE_AMD_OPENCL

	btDiscreteDynamicsWorld* world = new btSoftRigidDynamicsWorld(m_dispatcher,m_broadphase,m_solver,m_collisionConfiguration,softBodySolver);
	m_dynamicsWorld = world;
	m_dynamicsWorld->setInternalTickCallback(pickingPreTickCallback,this,true);


	m_dynamicsWorld->getDispatchInfo().m_enableSPU = true;
	m_dynamicsWorld->setGravity(btVector3(0,-10,0));
	m_softBodyWorldInfo.m_gravity.setValue(0,-10,0);
	m_guiHelper->createPhysicsDebugDrawer(world);
	//	clientResetScene();

	m_softBodyWorldInfo.m_sparsesdf.Initialize();
//	clientResetScene();

	//create ground object
	btTransform tr;
	tr.setIdentity();
	tr.setOrigin(btVector3(0,-12,0));

	btCollisionObject* newOb = new btCollisionObject();
	newOb->setWorldTransform(tr);
	newOb->setInterpolationWorldTransform( tr);
	int lastDemo = (sizeof(demofncs)/sizeof(demofncs[0]))-1;

	if (current_demo<0)
		current_demo = lastDemo;
	if (current_demo > lastDemo)
		current_demo =0;
		

	if (current_demo>19)
	{
		newOb->setCollisionShape(m_collisionShapes[0]);
	} else
	{
		newOb->setCollisionShape(m_collisionShapes[1]);
	}

	m_dynamicsWorld->addCollisionObject(newOb);

	m_softBodyWorldInfo.m_sparsesdf.Reset();





	

	motorcontrol.goal = 0;
	motorcontrol.maxtorque = 0;



	m_softBodyWorldInfo.air_density		=	(btScalar)1.2;
	m_softBodyWorldInfo.water_density	=	0;
	m_softBodyWorldInfo.water_offset		=	0;
	m_softBodyWorldInfo.water_normal		=	btVector3(0,0,0);
	m_softBodyWorldInfo.m_gravity.setValue(0,-10,0);


	m_autocam						=	false;
	m_raycast						=	false;
	m_cutting						=	false;
	m_results.fraction				=	1.f;
	
	demofncs[current_demo](this);

	m_guiHelper->autogenerateGraphicsObjects(m_dynamicsWorld);
}






void	SoftDemo::exitPhysics()
{

	//cleanup in the reverse order of creation/initialization

	//remove the rigidbodies from the dynamics world and delete them
	int i;
	for (i=m_dynamicsWorld->getNumCollisionObjects()-1; i>=0 ;i--)
	{
		btCollisionObject* obj = m_dynamicsWorld->getCollisionObjectArray()[i];
		btRigidBody* body = btRigidBody::upcast(obj);
		if (body && body->getMotionState())
		{
			delete body->getMotionState();
		}
		m_dynamicsWorld->removeCollisionObject( obj );
		delete obj;
	}

	//delete collision shapes
	for (int j=0;j<m_collisionShapes.size();j++)
	{
		btCollisionShape* shape = m_collisionShapes[j];
		m_collisionShapes[j] = 0;
		delete shape;
	}

	//delete dynamics world
	delete m_dynamicsWorld;
	m_dynamicsWorld = 0;

	//delete solver
	delete m_solver;

	//delete broadphase
	delete m_broadphase;

	//delete dispatcher
	delete m_dispatcher;



	delete m_collisionConfiguration;


}


class CommonExampleInterface*    SoftDemoCreateFunc(struct PhysicsInterface* pint, struct GUIHelperInterface* helper, int option)
{
	current_demo = option;
	return new SoftDemo(helper);
}