Danbias/Code/Physics/Bullet Source/LinearMath/btDefaultMotionState.h

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2014-02-09 21:24:09 +01:00
#ifndef BT_DEFAULT_MOTION_STATE_H
#define BT_DEFAULT_MOTION_STATE_H
#include "btMotionState.h"
///The btDefaultMotionState provides a common implementation to synchronize world transforms with offsets.
ATTRIBUTE_ALIGNED16(struct) btDefaultMotionState : public btMotionState
{
btTransform m_graphicsWorldTrans;
btTransform m_centerOfMassOffset;
btTransform m_startWorldTrans;
void* m_userPointer;
BT_DECLARE_ALIGNED_ALLOCATOR();
btDefaultMotionState(const btTransform& startTrans = btTransform::getIdentity(),const btTransform& centerOfMassOffset = btTransform::getIdentity())
: m_graphicsWorldTrans(startTrans),
m_centerOfMassOffset(centerOfMassOffset),
m_startWorldTrans(startTrans),
m_userPointer(0)
{
}
///synchronizes world transform from user to physics
virtual void getWorldTransform(btTransform& centerOfMassWorldTrans ) const
{
centerOfMassWorldTrans = m_centerOfMassOffset.inverse() * m_graphicsWorldTrans ;
}
///synchronizes world transform from physics to user
///Bullet only calls the update of worldtransform for active objects
virtual void setWorldTransform(const btTransform& centerOfMassWorldTrans)
{
m_graphicsWorldTrans = centerOfMassWorldTrans * m_centerOfMassOffset ;
}
};
#endif //BT_DEFAULT_MOTION_STATE_H