public void Init(LevelVM lVM, StepVM svm = null)
{
levelVM = lVM;
currStep = 0;
if (svm == null)
{
// if no step view model is passed in to the init method
// the game will start the first step of the level
InitStep(levelVM.GetFirstStepVM());
}
else
{
// if a step view model is passed into the Init method
// then the given step will be initialized.
InitStep(svm);
}
}