onSetIfVisible method
void
onSetIfVisible()
Implementation
void onSetIfVisible() {
bool nowIsVisible = _isVisibleInCamera();
if (nowIsVisible && !isVisible) {
(gameRef as BonfireGame).addVisible(this);
}
if (!nowIsVisible && isVisible) {
(gameRef as BonfireGame).removeVisible(this);
}
isVisible = nowIsVisible;
}