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Added slider constraint demo SliderConstraiintDemo

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rponom
2008-04-05 01:11:34 +00:00
parent d175bfa22a
commit 99d248ddfd
3 changed files with 386 additions and 0 deletions
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296
Demos/SliderConstraintDemo/SliderConstraintDemo.cpp Executable file
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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.
*/
/*
Added by Roman Ponomarev (rponom@gmail.com)
April 04, 2008
*/
//-----------------------------------------------------------------------------
#include "btBulletDynamicsCommon.h"
#include "LinearMath/btIDebugDraw.h"
#include "GLDebugDrawer.h"
#include "BMF_Api.h"
#include <stdio.h> //printf debugging
#include "SliderConstraintDemo.h"
#include "GL_ShapeDrawer.h"
#include "GlutStuff.h"
//-----------------------------------------------------------------------------
#define CUBE_HALF_EXTENTS 1.f
//-----------------------------------------------------------------------------
// A couple of sliders
static btSliderConstraint *spSlider1, *spSlider2;
//-----------------------------------------------------------------------------
static void draw_axes(const btRigidBody& rb, const btTransform& frame)
{
glBegin(GL_LINES);
// draw world transform
btVector3 from = rb.getWorldTransform().getOrigin();
btVector3 to = from + rb.getWorldTransform().getBasis() * btVector3(5,0,0);
// X in red
glColor3f(255.0F, 0.0F, 0.0F);
glVertex3d(from.getX(), from.getY(), from.getZ());
glVertex3d(to.getX(), to.getY(), to.getZ());
to = from + rb.getWorldTransform().getBasis() * btVector3(0,5,0);
// Y in green
glColor3f(0.0F, 255.0F, 0.0F);
glVertex3d(from.getX(), from.getY(), from.getZ());
glVertex3d(to.getX(), to.getY(), to.getZ());
to = from + rb.getWorldTransform().getBasis() * btVector3(0,0,5);
// Z in blue
glColor3f(0.0F, 0.0F, 255.0F);
glVertex3d(from.getX(), from.getY(), from.getZ());
glVertex3d(to.getX(), to.getY(), to.getZ());
// draw slider frame
btTransform calc_frame = rb.getWorldTransform() * frame;
from = calc_frame.getOrigin();
to = from + calc_frame.getBasis() * btVector3(10,0,0);
// X in red
glColor3f(255.0F, 0.0F, 0.0F);
glVertex3d(from.getX(), from.getY(), from.getZ());
glVertex3d(to.getX(), to.getY(), to.getZ());
to = from + calc_frame.getBasis() * btVector3(0,10,0);
// Y in green
glColor3f(0.0F, 255.0F, 0.0F);
glVertex3d(from.getX(), from.getY(), from.getZ());
glVertex3d(to.getX(), to.getY(), to.getZ());
to = from + calc_frame.getBasis() * btVector3(0,0,10);
// Z in blue
glColor3f(0.0F, 0.0F, 255.0F);
glVertex3d(from.getX(), from.getY(), from.getZ());
glVertex3d(to.getX(), to.getY(), to.getZ());
glEnd();
} // draw_axes()
//-----------------------------------------------------------------------------
static void drawSlider(btSliderConstraint* pSlider)
{
draw_axes(pSlider->getRigidBodyA(), pSlider->getFrameOffsetA());
draw_axes(pSlider->getRigidBodyB(), pSlider->getFrameOffsetB());
// draw limits in white
btVector3 from(pSlider->getLowerLinLimit(), 0, 0);
btVector3 to(pSlider->getUpperLinLimit(), 0, 0);
btTransform trans;
if(pSlider->getUseLinearReferenceFrameA())
{
trans = pSlider->getRigidBodyA().getWorldTransform() * pSlider->getFrameOffsetA();
}
else
{
trans = pSlider->getRigidBodyB().getWorldTransform() * pSlider->getFrameOffsetB();
}
from = trans * from;
to = trans * to;
glBegin(GL_LINES);
glColor3f(255.0F, 255.0F, 255.0F);
glVertex3d(from.getX(), from.getY(), from.getZ());
glVertex3d(to.getX(), to.getY(), to.getZ());
glEnd();
} // drawSlider()
//-----------------------------------------------------------------------------
void SliderConstraintDemo::initPhysics()
{
setCameraDistance(26.f);
// init world
m_collisionConfiguration = new btDefaultCollisionConfiguration();
m_dispatcher = new btCollisionDispatcher(m_collisionConfiguration);
btVector3 worldMin(-1000,-1000,-1000);
btVector3 worldMax(1000,1000,1000);
m_overlappingPairCache = new btAxisSweep3(worldMin,worldMax);
m_constraintSolver = new btSequentialImpulseConstraintSolver();
btDiscreteDynamicsWorld* wp = new btDiscreteDynamicsWorld(m_dispatcher,m_overlappingPairCache,m_constraintSolver,m_collisionConfiguration);
// wp->getSolverInfo().m_numIterations = 20; // default is 10
m_dynamicsWorld = wp;
// add floor
btCollisionShape* groundShape = new btStaticPlaneShape(btVector3(0,1,0),50);
m_collisionShapes.push_back(groundShape);
btTransform groundTransform;
groundTransform.setIdentity();
groundTransform.setOrigin(btVector3(0,-56,0));
btRigidBody* groundBody = localCreateRigidBody(0, groundTransform, groundShape);
// add box shape (will be reused for all bodies)
btCollisionShape* shape = new btBoxShape(btVector3(CUBE_HALF_EXTENTS,CUBE_HALF_EXTENTS,CUBE_HALF_EXTENTS));
m_collisionShapes.push_back(shape);
// mass of dymamic bodies
btScalar mass = btScalar(1.);
// add dynamic rigid body A1
btTransform trans;
trans.setIdentity();
btVector3 worldPos(0,0,0);
trans.setOrigin(worldPos);
btRigidBody* pRbA1 = localCreateRigidBody(mass, trans, shape);
pRbA1->setActivationState(DISABLE_DEACTIVATION);
// add dynamic rigid body B1
worldPos.setValue(-10,0,0);
trans.setOrigin(worldPos);
btRigidBody* pRbB1 = localCreateRigidBody(mass, trans, shape);
pRbB1->setActivationState(DISABLE_DEACTIVATION);
// create slider constraint between A1 and B1 and add it to world
btTransform frameInA, frameInB;
frameInA = btTransform::getIdentity();
frameInB = btTransform::getIdentity();
spSlider1 = new btSliderConstraint(*pRbA1, *pRbB1, frameInA, frameInB, true);
spSlider1->setLowerLinLimit(-15.0F);
spSlider1->setUpperLinLimit(-5.0F);
spSlider1->setLowerAngLimit(-SIMD_PI / 3.0F);
spSlider1->setUpperAngLimit( SIMD_PI / 3.0F);
m_dynamicsWorld->addConstraint(spSlider1, true);
// add kinematic rigid body A2
worldPos.setValue(0,2,0);
trans.setOrigin(worldPos);
btRigidBody* pRbA2 = localCreateRigidBody(0, trans, shape);
pRbA2->setActivationState(DISABLE_DEACTIVATION);
// add dynamic rigid body B2
worldPos.setValue(-10,2,0);
trans.setOrigin(worldPos);
btRigidBody* pRbB2 = localCreateRigidBody(mass, trans, shape);
pRbB2->setActivationState(DISABLE_DEACTIVATION);
// create slider constraint between A2 and B2 and add it to world
spSlider2 = new btSliderConstraint(*pRbA2, *pRbB2, frameInA, frameInB, true);
spSlider2->setLowerLinLimit(-15.0F);
spSlider2->setUpperLinLimit(-5.0F);
spSlider2->setLowerAngLimit(-SIMD_PI / 3.0F);
spSlider2->setUpperAngLimit( SIMD_PI / 3.0F);
// change default damping and restitution
spSlider2->setDampingDirLin(0.005F);
spSlider2->setRestitutionLimLin(1.1F);
m_dynamicsWorld->addConstraint(spSlider2, true);
} // SliderConstraintDemo::initPhysics()
//-----------------------------------------------------------------------------
SliderConstraintDemo::~SliderConstraintDemo()
{
//cleanup in the reverse order of creation/initialization
int i;
//removed/delete constraints
for (i=m_dynamicsWorld->getNumConstraints()-1; i>=0 ;i--)
{
btTypedConstraint* constraint = m_dynamicsWorld->getConstraint(i);
m_dynamicsWorld->removeConstraint(constraint);
delete constraint;
}
//remove the rigidbodies from the dynamics world and delete them
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];
delete shape;
}
//delete dynamics world
delete m_dynamicsWorld;
//delete solver
delete m_constraintSolver;
//delete broadphase
delete m_overlappingPairCache;
//delete dispatcher
delete m_dispatcher;
delete m_collisionConfiguration;
} // SliderConstraintDemo::~SliderConstraintDemo()
//-----------------------------------------------------------------------------
void SliderConstraintDemo::clientMoveAndDisplay()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
float dt = float(getDeltaTimeMicroseconds()) * 0.000001f;
//during idle mode, just run 1 simulation step maximum
int maxSimSubSteps = m_idle ? 1 : 1;
if(m_idle)
{
dt = 1.0/420.f;
}
int numSimSteps = m_dynamicsWorld->stepSimulation(dt,maxSimSubSteps);
//optional but useful: debug drawing
m_dynamicsWorld->debugDrawWorld();
bool verbose = false;
if (verbose)
{
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);
}
}
}
renderme();
drawSlider(spSlider1);
drawSlider(spSlider2);
glFlush();
glutSwapBuffers();
} // SliderConstraintDemo::clientMoveAndDisplay()
//-----------------------------------------------------------------------------
void SliderConstraintDemo::displayCallback(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
if(m_dynamicsWorld)
{
m_dynamicsWorld->debugDrawWorld();
}
drawSlider(spSlider1);
drawSlider(spSlider2);
renderme();
glFlush();
glutSwapBuffers();
} // SliderConstraintDemo::displayCallback()
//-----------------------------------------------------------------------------

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Demos/SliderConstraintDemo/SliderConstraintDemo.h Executable file
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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.
*/
//-----------------------------------------------------------------------------
#ifndef SLIDER_CONSTRAINT_DEMO_H
#define SLIDER_CONSTRAINT_DEMO_H
//-----------------------------------------------------------------------------
#include "btBulletDynamicsCommon.h"
#include "BulletDynamics/ConstraintSolver/btSliderConstraint.h"
#include "DemoApplication.h"
//-----------------------------------------------------------------------------
/// SliderConstraintDemo shows how to create a slider constraint
class SliderConstraintDemo : public DemoApplication
{
//keep track of variables to delete memory at the end
btAlignedObjectArray<btCollisionShape*> m_collisionShapes;
class btBroadphaseInterface* m_overlappingPairCache;
class btCollisionDispatcher* m_dispatcher;
class btConstraintSolver* m_constraintSolver;
class btDefaultCollisionConfiguration* m_collisionConfiguration;
public:
virtual ~SliderConstraintDemo();
void initPhysics();
void initModel();
void drawSliders();
void drawSliderConstraint(btSliderConstraint* constraint);
virtual void clientMoveAndDisplay();
virtual void displayCallback();
static DemoApplication* Create()
{
SliderConstraintDemo* demo = new SliderConstraintDemo();
demo->myinit();
demo->initPhysics();
return demo;
}
};
#endif //SLIDER_CONSTRAINT_DEMO_H

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Demos/SliderConstraintDemo/main.cpp Executable file
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/*
Added by Roman Ponomarev (rponom@gmail.com)
April 04, 2008
*/
#include "SliderConstraintDemo.h"
#include "GlutStuff.h"
int main(int argc,char** argv)
{
SliderConstraintDemo* sliderConstraintDemo = new SliderConstraintDemo();
sliderConstraintDemo->initPhysics();
return glutmain(argc, argv,640,480,"Slider Constraint Demo. http://www.continuousphysics.com/Bullet/phpBB2/", sliderConstraintDemo);
}