[farshizzo]

Hi,

Your vrpn callback must be a function. You are trying to pass a class method instead, which won't work. Try the following instead:

(Tracker.h)

#include <vrpn_Tracker.h>

class Tracker{
public:
	Tracker(char* address);
	~Tracker();

	vrpn_float64 lastPosition[3];

protected:
	vrpn_Tracker_Remote* tracker;
};

(Tracker.cpp)

#include <string.h>
#include <vrpn_Tracker.h>
#include "Tracker.h"

void handlePos(void *userdata, vrpn_TRACKERCB t)
{
	Tracker *tracker = (Tracker*)userdata;
	tracker->lastPosition[0] = t.pos[0];
	tracker->lastPosition[1] = t.pos[1];
	tracker->lastPosition[2] = t.pos[2];
}

Tracker::Tracker(char* address)
{
	tracker = new vrpn_Tracker_Remote(address);
	//Setup callback for when new position data comes in
	tracker->register_change_handler((void*)this, handlePos);
}

Tracker::~Tracker()
{
    delete tracker;
}