Unity Editor Layout | First C# Script | Unity Log Messages | .NET Assemblies - Unity C# Scripting 0

Unity Editor Layout | First C# Script | Unity Log Messages | .NET Assemblies - Unity C# Scripting 02
Notes for You::
0:00:00 How to Customize Unity Layout: https://youtu.be/DBqSNJwz2a4
- Unity gets open with initial layout

Layout:
- is arrangement of panels

Layouts Dropdown Button from ToolBar:
- gives access to all layouts [2 by 3, 4 Split, Default, Tall, Wide]
- allows us to Save, Delete and Reset Layouts


0:02:46 How to Create and Execute First C# Script in Unity: https://youtu.be/DBqSNJwz2a4?t=166
Step 1. Create Scripts folder
- Right click on Assets folder in Project panel
- Go to Create - Click on Folder option.
- Name it [Scripts].

Step 2. Create C# Script
- Right click on Scripts folder
- Go to Create - Click on C# Script option.
- Name it [FirstScript] by following Pascal case naming convention.

Step 3. Open C# Script
- Double click on FirstScript.
- Unity opens the file in default script editor known as MonoDevelop or Visual Studio.

Mono Develop ( IDE ) :
- We edit, compile, run and debug all our c# codes in MonoDevelop or Visual Studio.

Step 4. Type the code
- Type print("Hello Unity"); in Start method. Save File.

Step 5. Attach Script to MainCamera
- Select Main Camera,
- Go to Inspector panel - Click on Add Component button
- Click on Scripts - Select FirstScript for execution

OR
- Drag and Drop FirstScript on to MainCamera

Step 6. Execute the Script
- Click on the Play button to execute the code or stop the execution of code.

Note: For execution MonoBehavior Scripts must be attached to some game object.


0:09:13 Why should we save a Unity project before exit: https://youtu.be/DBqSNJwz2a4?t=553
- We must and should save Unity Project before closing it; because any modification done to the game objects in the scene are not saved.


0:15:58 Understand Unity Log Messages and Errors: https://youtu.be/DBqSNJwz2a4?t=958

1. Log messages :
- print or Debug.Log methods are used to display log messages
- Log messages are used for debugging purpose

2. Error Messages :
A. Syntax Errors:
- Syntactic errors are handled by Unity (parsing error)
Ex: Missing semicolon, etc.

B. Logical Errors:
- Logical errors are handled by programmers (with Debugger tool)
Ex: Not reducing player health

C. Runtime Errors: Exceptions
- Runtime errors handled by programmers (with Exception handling)
Ex: Array index out of bounds, divided by zero etc.

3. Warning Messages:
- Indicate may create problems later.
Ex: Variable initialized but not used.

Note:
You cannot run the project if it has error message.
You can run the project if it has warning messages.


0:24:27 Understand first Unity C# Script in depth: https://youtu.be/DBqSNJwz2a4?t=1467
Example Program:
- C# program to print "Hello Unity" in Console panel

using UnityEngine;

public class FirstScript :MonoBehaviour
{
// Start is called before the first frame update
void Start()
{
print("Hello Unity");
}

}
public:
- is access modifier makes the class available publicly (i.e. to Unity engine)

class:
- is keyword for defining a class and in C# everything should be part of a class.

Colon symbol(:)
- indicates extends in C#

MonoBehaviour:
- As print method is defined within MonoBehaviour class; We must extend our class with MonoBehaviour.
- Convert our class as a component so that we can attach it to game object for execution.

using UnityEngine;
- MonoBehaviour class is present inside UnityEngine namespace; Hence using UnityEngine;

print() :
- Logs message to Unity Console (Identical to Debug.Log)

Start(){} :
- is called when a script is enabled just before any of the Update methods is called the first time.

Update(){} :
- is called every frame, if the MonoBehaviour is enabled.


0:36:00 Understand .NET Assemblies: https://youtu.be/DBqSNJwz2a4?t=2160
- Assembly is a file that is automatically generated by the compiler upon successful compilation of every .NET application.

There are 2 kinds of assemblies in C#:
1. DLL (Dynamic Link Library):
- collection of namespaces
- DLL files are not self executable
- Example DLLs : mscorlib.dll, UnityEngine.dll

2. EXE (Executable):
- EXE files are self executable

Library:
- Library is a collection of namespaces.
- Namespace is collection of other namespaces and data structures (like Classes, structures, events etc.)
Ex:
UnityEngine.dll contains UnityEngine namespace contains MonoBehavior Class.

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