9. First Person Shooter Part 3 – Implementing Gameplay and AI
by Chris Dickinson, John P. Doran, Greg Lukosek
Unity 5: Learning C# by Developing Games
- Unity 5: Learning C# by Developing Games
- Table of Contents
- Unity 5: Learning C# by Developing Games
- Unity 5: Learning C# by Developing Games
- Credits
- Preface
- 1. Module 1
- 1. Discovering Your Hidden Scripting Skills and Getting Your Environment Ready
- Prerequisite knowledge to use this book
- Dealing with scriptphobia
- Downloading Unity
- Teaching behavior to GameObjects
- C# documentation – where to find it? Do I need it at all?
- Working with C# script files
- Creating a C# script file
- Introducing the MonoDevelop code editor
- Instance? What is it?
- Summary
- 2. Introducing the Building Blocks for Unity Scripts
- 3. Getting into the Details of Variables
- Writing C# statements properly
- Understanding component properties in Unity's Inspector
- Changing a property's value in the Inspector panel
- Private variables
- Naming your variables properly
- Beginning variable names with lowercase
- Using multiword variable names
- Declaring a variable and its type
- Assigning values while declaring a variable
- Where you declare a variable is important
- Variable scope – determining where a variable can be used
- Summary
- 4. Getting into the Details of Methods
- 5. Lists, Arrays, and Dictionaries
- 6. Loops
- 7. Object, a Container with Variables and Methods
- 8. Let's Make a Game! – From Idea to Development
- 9. Starting Your First Game
- 10. Writing GameManager
- 11. The Game Level
- 12. The User Interface
- 13. Collectables — What Next?
- 1. Discovering Your Hidden Scripting Skills and Getting Your Environment Ready
- 2. Module 2
- 01. 2D Twin-stick Shooter
- Project overview
- Setting up the project
- Creating our scene
- Implementing player movement
- Shooting behavior
- Creating enemies
- Adding GameController to spawn enemy waves
- Particle systems for enemy explosion
- Adding in sound effects/music
- Adding in points, score, and wave numbers
- Publishing the game
- Summary
- Challenges
- 2. Creating GUIs
- 3. GUIs Part 2 – Clicker Game
- 4. Mobile Endless Game – Procedural Content
- Project overview
- Prerequisites
- Project setup
- Adding the background
- Adding a simple animated character
- Making a repeating background
- Working with sorting layers
- Creating our player behaviour
- Creating obstacles
- Spawning obstacles at runtime
- Game start and end behaviours
- Keeping score
- Summary
- Challenges
- 5. Shooting Gallery – Working with Animations and Tweens
- 6. Side-scrolling Platformer
- 7. First Person Shooter Part 1 – Creating Exterior Environments
- 8. First-person Shooter Part 2 – Creating Interior Environments
- 9. First Person Shooter Part 3 – Implementing Gameplay and AI
- 10. Building an In-Game Level Editor
- 11. Finishing Touches
- 01. 2D Twin-stick Shooter
- 3. Module 3
- 1. Detecting Performance Issues
- 2. Scripting Strategies
- Cache Component references
- Obtaining Components using the fastest method
- Removing empty callback declarations
- Avoiding the Find() and SendMessage() methods at runtime
- Disabling unused scripts and objects
- Consider using distance-squared over distance
- Avoid retrieving string properties from GameObjects
- Update, Coroutines, and InvokeRepeating
- Consider caching Transform changes
- Faster GameObject null reference checks
- Summary
- 3. The Benefits of Batching
- 4. Kickstart Your Art
- Audio
- Loading audio files
- Encoding formats and quality levels
- Audio performance enhancements
- Minimize active Audio Source count
- Minimize Audio Clip references
- Enable Force to Mono for 3D sounds
- Resample to lower frequencies
- Consider all encoding formats
- Beware of streaming
- Apply Filter effects through Mixer groups to reduce duplication
- Use "WWW.audioClip" responsibly
- Consider Audio Module files for background music
- Texture files
- Mesh and animation files
- Summary
- Audio
- 5. Faster Physics
- Physics Engine internals
- Physics performance optimizations
- Scene setup
- Use Static Colliders appropriately
- Optimize the Collision Matrix
- Prefer discrete collision detection
- Modify the FixedUpdate frequency
- Adjust the Maximum Allowed Timestep
- Minimize cast and bounding-volume checks
- Avoid complex Mesh Colliders
- Avoid complex physics components
- Let physics objects sleep
- Modify Solver Iteration Count
- Optimizing ragdolls
- Know when to use physics
- Consider upgrading to Unity 5
- Summary
- 6. Dynamic Graphics
- Profiling rendering issues
- Front end bottlenecks
- Back end bottlenecks
- Fill rate
- Overdraw
- Occlusion Culling
- Shader optimization
- Consider using Shaders intended for mobile platforms
- Use small data types
- Avoid changing precision while swizzling
- Use GPU-optimized helper functions
- Disable unnecessary features
- Remove unnecessary input data
- Only expose necessary variables
- Reduce mathematical complexity
- Reduce texture lookups
- Avoid conditional statements
- Reduce data dependencies
- Surface Shaders
- Use Shader-based LOD
- Memory bandwidth
- VRAM limits
- Fill rate
- Lighting and Shadowing
- Optimizing graphics for mobile
- Summary
- 7. Masterful Memory Management
- 8. Tactical Tips and Tricks
- A. Bibliography
- Index
When I start teaching my game design students, one of the questions that I'll often hear is "What is a game?" Now, to some people, the card game War (http://en.wikipedia.org/wiki/War_(card_game)) is a game; however, the game is already determined before anyone actually plays the game because players have absolutely no interactions besides flipping cards.
Renowned game programmer and designer Sid Meier says that a game is "a series of interesting choices," and I really like that definition. At my alma mater and current employer DigiPen, we were taught that a video game was a real-time interactive simulation.
Having an environment is an excellent first step towards creating your game project, but this is a real-time simulation though it's not very interactive.
In this chapter, we are going to be adding that interactivity in the form of adding enemies, shooting behaviors, and the gameplay to make our game truly shine. In addition, we'll also learn how to use an Xbox 360 Controller to accept input in our game as well.
This project will be split into a number of tasks. It will be a simple step-by-step process from beginning to end. Here is the outline of our tasks:
- Creating our player
- Adding shooting behavior
- Creating an enemy
- Enemy movement
- Shooting/killing enemies
- Using Xbox 360 Controller Input
- Moving to other levels
In this chapter, we will continue where the last chapter left off using the same project. You may continue with your previous project or pick up a copy along with the assets for this chapter from the example code provided for this book on Packt's website at https://www.packtpub.com/books/content/support.
In addition, the completed project and source files are located there for you to check whether you have any questions or need clarification.
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