Loading external resource files – by downloading files from the Internet
by Matt Smith, Chico Queiroz
Unity 4.x Cookbook
- Unity 4.x Cookbook
- Table of Contents
- Unity 4.x Cookbook
- Credits
- About the Authors
- About the Reviewers
- www.PacktPub.com
- Preface
- 1. Getting Started with Unity 4.x
- Introduction
- Installing Unity 4.x
- Setting your preferences
- Understanding and optimizing the User Interface
- Saving assets created in Unity as Prefabs
- Discovering Unity's content
- Importing your own content
- Importing Unity packages into your project
- Importing custom packages into your project
- Exporting custom packages from your project
- Adding custom packages to Unity's quick list
- Using the Project browser
- 2. Using Cameras
- 3. Creating Maps and Materials
- Introduction
- Creating a reflective material
- Creating a self-illuminated material
- Creating specular texture maps
- Creating transparency texture maps
- Using cookie textures to simulate a cloudy outdoor
- Creating a color selection dialog
- Combining textures in real time through the GUI
- Highlighting materials at mouse over
- Animating textures by looping through array of materials (for example, simulated video)
- Disabling culling for a material
- 4. Creating GUIs
- Introduction
- Displaying a digital clock
- Displaying an analogue clock
- Displaying a compass to show player direction
- Displaying a radar to indicate relative locations of objects
- Displaying images for corresponding integers
- Displaying images for corresponding floats and ranges
- Displaying a digital countdown timer
- Displaying a countdown timer graphically (5, 4, 3, 2, 1 – blast off)
- Displaying a countdown timer graphically as a pie-chart style clock
- Creating a message that fades away
- Displaying inventory texts for single object pickups
- Displaying inventory icons for single object pickups
- Managing inventories with a general purpose PickUp class
- Controlling the scrollbar with the mouse wheel
- Implementing custom mouse cursor icons
- 5. Controlling Animations
- Introduction
- Configuring a character's Avatar and Idle animation
- Moving your character with Root Motion and Blend Trees
- Mixing animations with Layers and Masks
- Overriding Root Motion via script
- Adding rigid props to animated characters
- Making an animated character throw an object
- Applying ragdoll physics to a character
- Rotating the character's torso to aim
- 6. Playing and Manipulating Sounds
- 7. Working with External Resource Files and Devices
- Introduction
- Loading external resource files – by Unity Default Resources
- Loading external resource files – by manually storing files in Unity's Resources folder
- Loading external resource files – by downloading files from the Internet
- Saving and loading player data – using static properties
- Saving and loading player data – using PlayerPrefs
- Saving screenshots from the game
- Control characters in Unity with the Microsoft Kinect using the Zigfu samples
- Animating your own characters with the Microsoft Kinect controller
- Homemade mocap by storing movements from the Microsoft Kinect controller
- Setting up a leaderboard using PHP/MySQL
- 8. Working with External Text Files and XML Data
- Introduction
- Loading external text files using the TextAsset public variable
- Loading external text files using C# file streams
- Saving external text files with C# file streams
- Loading and parsing external XML files
- Creating XML text data manually using XMLWriter
- Creating XML text data automatically through serialization
- Creating XML text files – saving XML directly to text files with XMLDocument.Save()
- 9. Managing Object States and Controlling Their Movements
- Introduction
- Controlling cube movement through player controls
- Controlling object look-at behavior
- Controlling object-to-object movements (seek, flee, follow at a distance)
- Controlling object group movement through flocking
- Firing objects by instantiation with forward velocity
- Finding a random spawn point
- Finding the nearest spawn point
- Following waypoints in a sequence
- Managing object behavior with states
- Managing complex object behavior with the state pattern
- 10. Improving Games with Extra Features and Optimization
- Introduction
- Pausing the game
- Implementing slow motion
- Implementing 3D stereography with polarized projection
- Preventing your game from running on unknown servers
- Identifying performance "bottlenecks" with code profiling
- Reducing the number of objects by destroying objects at a "death" time
- Reducing the number of enabled objects by disabling objects whenever possible
- Improving efficiency with delegates and events (and avoiding SendMessage!)
- Executing methods regularly but independent of frame rate with coroutines
- Spreading long computations over several frames with coroutines
- Caching, rather than component lookups and "reflection" over objects
- 11. Taking Advantage of Unity Pro
- Index
One way to store and read text file data is to store the text files on the Web. In this recipe, the contents of a text file for a given URL is downloaded, read, and then displayed.
For this recipe you will need to have access to files on a web server. If you run a local web server such as Apache, or have your own web hosting, then you could use the files in the 0423_07_01 folder and the corresponding URL. Otherwise, you may find the following URLs useful since they are the web locations of an image file (a Packt logo) and a text file (an "ASCII-art" badger picture):
- Add the following C# script to the Main Camera:
// file: ReadWebImageTexture.cs using UnityEngine; using System.Collections; public class ReadWebImageTexture : MonoBehaviour { public string url = "http://www.packtpub.com/sites/default/files/packt_logo.png"; private Texture2D externalImage; private void Start () { StartCoroutine( LoadWWW() ); } private void OnGUI() { GUILayout.Label ( "url = " + url ); GUILayout.Label ( externalImage ); } private IEnumerator LoadWWW(){ yield return 0; WWW imageFile = new WWW (url); yield return imageFile; externalImage = imageFile.texture; } - Play the scene. Once downloaded, the contents of the image file will be displayed.
When the game starts, our Start() method starts the LoadWWW() co-routine method. A co-routine is a method that can keep on running in the background without halting or slowing down the other parts of the game and the frame rate. The yield statement indicates that once a value can be returned for imageFile, the remainder of the method can be executed, that is, until the file has finished downloading, no attempt should be made to extract the texture property of the WWW object variable.
For each frame our OnGUI() method displays the contents of url string variable and attempts to display the externalImage texture image.
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