The 'this' keyword in Unity3D scripts (c# script, JavaScript)
unity-game-engine
Solution
If you attach `CS01` to a game object in the scene and this game object will be loaded, you will have one instance of each. During the construction of `CS01` before `Awake` and `OnEnable` are called, all properties like `gameObject`, `tranform`, `name`, etc. are initialised. Most of them will get a reference to the parent's properties if they are refering to an object.
`string` class is somewhat special in C# or java and behaves rather like a `struct` - it will be kind of copied. In detail: `CS01.name` (which is inherited from `Unity.Object`) will get the game object's name. As long as they have both the same name, both variables point to the same place in memory. When you change CS01's name, a new `string` instance will be created internally and be initialised with the text you assign to it. Thus the original i.e. name property of game object will remain unchanged.
- Yes
- Most components have properties that refer to the `GameObject` properties, kind of shortcut
- Like in 2. `name` is defined in base class `Object`. `GameObject` and `MonoBehaviour` both are derived from `Unity.Object`.
- Exactly, this is the class where you writing it in the code
Problem
I'm confused that: CODE (CS01.cs) The script is attached to a simple Cube object. ``` using UnityEngine; using System.Collections; public class CS01 : MonoBehaviour { // Use this for initialization void Start () { Debug.Log (this); //--> Cube(CS01) Debug.Log (this.GetType()); //--> CS01 Debug.Log (this.GetType() == typeof(UnityEngine.GameObject)); //--> False Debug.Log (this == gameObject); //--> False Debug.Log (this.name); //--> Cube Debug.Log (gameObject.name); //--> Cube this.name = "Hello"; // --> Will get the gameObject's name changed to 'Hello' Debug.Log (gameObject.name); //--> Hello } // Update is called once per frame void Update () { } } ``` 1> Will `CS01` be an script object right? DOC: Scripting inside Unity consists of attaching custom script objects called behaviours to game objects. 2> In `Component` object, variables like transform, renderer, rigidbody are referenced to the components of `gameObject` this `Component` attached to. So in the script, `this.renderer.material.color = Color.red;` is equivalent to `this.gameObject.renderer.material.color = Color.red`. However, the description of variable `name` in the document `name: The name of the object.` only tells it's the name of the object. 3> So, how to understand the code above? Does the variable `name` also return the `name` of the gameObject this script attached to? 4> `this` means the script object but not the gameObject the script attached to, right?