bool CalculateCoordinates(float *origin, float *vecScreen)
{
    int cResult = 0;
	int displayCenterX = pEngine->GetWindowCenterX();
	int displayCenterY = pEngine->GetWindowCenterY();
    if( pEngine->GetLocalPlayer() != NULL )
        cResult = pEngine->pTriAPI->WorldToScreen( origin, vecScreen );
    if( vecScreen[0] < 1 && vecScreen[1] < 1 && vecScreen[0] > -1 && vecScreen [1] > -1 && !cResult )
    {
        vecScreen[0] = vecScreen[0] * displayCenterX + displayCenterX;
        vecScreen[1] = -vecScreen[1] * displayCenterY + displayCenterY;
        return true;
    }
    return false;
}