mirror of
https://github.com/bulletphysics/bullet3
synced 2024-12-13 21:30:09 +00:00
151 lines
4.4 KiB
C++
151 lines
4.4 KiB
C++
/*
|
|
Bullet Continuous Collision Detection and Physics Library
|
|
Copyright (c) 2015 Google Inc. http://bulletphysics.org
|
|
|
|
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.
|
|
*/
|
|
|
|
|
|
|
|
#include "Bridge.h"
|
|
|
|
#include "btBulletDynamicsCommon.h"
|
|
#include "LinearMath/btVector3.h"
|
|
#include "LinearMath/btAlignedObjectArray.h"
|
|
#include "../CommonInterfaces/CommonRigidBodyBase.h"
|
|
|
|
const int TOTAL_PLANKS = 10;
|
|
struct BridgeExample : public CommonRigidBodyBase
|
|
{
|
|
BridgeExample(struct GUIHelperInterface* helper)
|
|
:CommonRigidBodyBase(helper)
|
|
{
|
|
}
|
|
virtual ~BridgeExample(){}
|
|
virtual void initPhysics();
|
|
virtual void renderScene();
|
|
void resetCamera()
|
|
{
|
|
float dist = 41;
|
|
float pitch = -35;
|
|
float yaw = 52;
|
|
float targetPos[3]={0,0.46,0};
|
|
m_guiHelper->resetCamera(dist,yaw,pitch,targetPos[0],targetPos[1],targetPos[2]);
|
|
}
|
|
};
|
|
|
|
void BridgeExample::initPhysics()
|
|
{
|
|
m_guiHelper->setUpAxis(1);
|
|
|
|
createEmptyDynamicsWorld();
|
|
|
|
m_guiHelper->createPhysicsDebugDrawer(m_dynamicsWorld);
|
|
|
|
if (m_dynamicsWorld->getDebugDrawer())
|
|
m_dynamicsWorld->getDebugDrawer()->setDebugMode(btIDebugDraw::DBG_DrawWireframe+btIDebugDraw::DBG_DrawContactPoints);
|
|
|
|
///create a few basic rigid bodies
|
|
btBoxShape* groundShape = createBoxShape(btVector3(btScalar(50.),btScalar(50.),btScalar(50.)));
|
|
m_collisionShapes.push_back(groundShape);
|
|
|
|
btTransform groundTransform;
|
|
groundTransform.setIdentity();
|
|
groundTransform.setOrigin(btVector3(0,-50,0));
|
|
{
|
|
btScalar mass(0.);
|
|
createRigidBody(mass,groundTransform,groundShape, btVector4(0,0,1,1));
|
|
}
|
|
|
|
//create two fixed boxes to hold the planks
|
|
|
|
|
|
|
|
{
|
|
//create a few dynamic rigidbodies
|
|
// Re-using the same collision is better for memory usage and performance
|
|
btScalar plankWidth = 0.4;
|
|
btScalar plankHeight = 0.2;
|
|
btScalar plankBreadth = 1;
|
|
btScalar plankOffset = plankWidth; //distance between two planks
|
|
btScalar bridgeWidth = plankWidth*TOTAL_PLANKS + plankOffset*(TOTAL_PLANKS-1);
|
|
btScalar bridgeHeight = 5;
|
|
btScalar halfBridgeWidth = bridgeWidth*0.5f;
|
|
|
|
btBoxShape* colShape = createBoxShape(btVector3(plankWidth,plankHeight,plankBreadth));
|
|
|
|
m_collisionShapes.push_back(colShape);
|
|
|
|
/// Create Dynamic Objects
|
|
btTransform startTransform;
|
|
startTransform.setIdentity();
|
|
|
|
btScalar mass(1.f);
|
|
|
|
//rigidbody is dynamic if and only if mass is non zero, otherwise static
|
|
bool isDynamic = (mass != 0.f);
|
|
|
|
btVector3 localInertia(0,0,0);
|
|
if (isDynamic)
|
|
colShape->calculateLocalInertia(mass,localInertia);
|
|
|
|
//create a set of boxes to represent bridge
|
|
btAlignedObjectArray<btRigidBody*> boxes;
|
|
int lastBoxIndex = TOTAL_PLANKS-1;
|
|
for(int i=0;i<TOTAL_PLANKS;++i) {
|
|
float t = float(i)/lastBoxIndex;
|
|
t = -(t*2-1.0f) * halfBridgeWidth;
|
|
startTransform.setOrigin(btVector3(
|
|
btScalar(t),
|
|
bridgeHeight,
|
|
btScalar(0)
|
|
)
|
|
);
|
|
boxes.push_back(createRigidBody((i==0 || i==lastBoxIndex)?0:mass,startTransform,colShape));
|
|
}
|
|
|
|
|
|
//add N-1 spring constraints
|
|
for(int i=0;i<TOTAL_PLANKS-1;++i) {
|
|
btRigidBody* b1 = boxes[i];
|
|
btRigidBody* b2 = boxes[i+1];
|
|
|
|
btPoint2PointConstraint* leftSpring = new btPoint2PointConstraint(*b1, *b2, btVector3(-0.5,0,-0.5), btVector3(0.5,0,-0.5));
|
|
m_dynamicsWorld->addConstraint(leftSpring);
|
|
|
|
btPoint2PointConstraint* rightSpring = new btPoint2PointConstraint(*b1, *b2, btVector3(-0.5,0,0.5), btVector3(0.5,0,0.5));
|
|
m_dynamicsWorld->addConstraint(rightSpring);
|
|
}
|
|
}
|
|
|
|
m_guiHelper->autogenerateGraphicsObjects(m_dynamicsWorld);
|
|
}
|
|
|
|
|
|
void BridgeExample::renderScene()
|
|
{
|
|
CommonRigidBodyBase::renderScene();
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
CommonExampleInterface* ET_BridgeCreateFunc(CommonExampleOptions& options)
|
|
{
|
|
return new BridgeExample(options.m_guiHelper);
|
|
}
|
|
|
|
|
|
|