xii Contents
9.7 Implementing Game Over!!! .............................................. 597
9.8 AI a nd Enemy Spawning ....................................................600
9.8.1 Spawning Enemies................................................. 601
9.8.2 Setting up Enemy Artificial Intelligence................ 607
9.9 Particle Systems and Visual Effects ....................................614
9.9.1 Destructio n Visual Effects .....................................614
9.9.2 Hit Visual Effects...................................................616
9.10 Summary.............................................................................628
Appendix A Material Expressions in Unreal Engine 4 .................................... 631
A.1 Introduction ... ...