structs, pointer, static callback function

[vonCZ]

I have a static callback function like so:

void Coin3dScene::flythruCB(void *data, SoSensor *s)
{
  MyFlythruData *locData = (MyFlythruData *)data;
  //etc...
}

void Coin3dScene::flythruCB(void *data, SoSensor *s)
{
  MyFlythruData *locData = (MyFlythruData *)data;
  //etc...
}

To copy to clipboard, switch view to plain text mode 

The "data" I pass to the function is a struct that references variables I need to access in the callback:

typedef struct
{
  float  *flyTimeLen;
  bool  *flyLoop;
} MyFlythruData;

typedef struct
{
  float  *flyTimeLen;
  bool  *flyLoop;
} MyFlythruData;

To copy to clipboard, switch view to plain text mode 

set-up like so:

MyFlythruData *myflydata = new MyFlyData;
  myflydata->flyTimeLen = &FlyTime;
  myflydata->flyLoop = &FlyLoop;

MyFlythruData *myflydata = new MyFlyData;
  myflydata->flyTimeLen = &FlyTime;
  myflydata->flyLoop = &FlyLoop;

To copy to clipboard, switch view to plain text mode 

My question: is it necessary to use pointers in the struct as I've done? The callback function is called 50 times/second; by passing pointers to variables rather than the variable itself, the function should operate more smoothly with less overhead, right?

But on the other hand, since the callback receives a pointer to data rather than just "data"... it's unnecesary to use pointers for the variables inside the struct... if I don't otherwise need to. right?