Sharp Coder is reader-supported, meaning when you buy through links on our site, we may earn an affiliate commission.

Guide to MonoBehaviour in Unity

0 Comments ยท May 10, 2023

MonoBehaviour is a base class for all Unity scripts that provides a wide range of built-in functionality for controlling game objects, responding to player input, controlling the rendering, and many more.

Basics of MonoBehaviour

To create a new script that inherits from MonoBehaviour, you can use the "Create" menu in the Unity editor. Simply right-click in the Project window, select "Create," and then choose "C# Script." Name your script and double-click on it to open it in your preferred code editor.

The basic structure of a script derived from MonoBehaviour looks like this:

using UnityEngine;

public class MyScript : MonoBehaviour
    // Variables and methods go here

MyScript is the name of your script, and it inherits from the MonoBehaviour class. You can add your own variables and methods to the script, and Unity will automatically call certain methods on the script based on its behavior in the game.

Methods in MonoBehaviour

MonoBehaviour provides a number of methods that can be overridden to control the behavior of your game objects. Here are some of the most commonly used methods:

  • Start(): Called once when the script is first enabled. This method is often used to initialize variables and set up the game object.
  • Update(): Called every frame, often tied to a screen's refresh rate. This method is commonly used to update the game object's position, rotation, and other properties based on player input.
  • FixedUpdate(): Called every fixed frame, at a fixed interval (e.g. 50 times per second). This method is often used for physics-related updates, such as moving a rigidbody.
  • LateUpdate(): Called every frame after all other updates have been processed. This method is often used to update the game object's position and rotation based on the position of other game objects, such as a camera that follows the player.
  • OnCollisionEnter(Collision collision): Called when the game object collides with another object. This method is often used to handle collision-related events, such as destroying a bullet when it hits an enemy.

Variables in MonoBehaviour

MonoBehaviour also provides access to a number of built-in variables that can be used to control the behavior of the game object. Here are some of the most commonly used variables:

  • transform: Provides access to the game object's transform component, which controls its position, rotation, and scale.
  • gameObject: Provides access to the game object itself, which can be used to enable or disable the game object, among other things.
  • GetComponent<T>(): Returns a component of type T attached to the game object, or null if no such component exists.
  • Time.deltaTime: The amount of time that has passed since the last frame. This can be used to create smooth and consistent animations and updates.
  • Input: A static class that provides access to the player's input devices, such as the keyboard, mouse, and gamepad.

Best Practices for Using MonoBehaviour

Here are some best practices to keep in mind when using MonoBehaviour in your Unity projects:

  • Keep your scripts organized and easy to read by breaking them up into small, focused methods.
  • Use comments and documentation to explain what each method and variable does.
  • Use the built-in Unity editor to test and tweak your scripts, and iterate on them until they work as expected.
  • Use Unity's profiling and debugging tools to identify and fix performance issues in your scripts.
  • Use third-party tools and libraries, such as asset packs and plugins, to save time and improve the quality of your scripts.

By following these best practices you can write efficient and effective code to power your Unity games and experiences.


MonoBehaviour is a powerful and versatile base class in Unity that provides a wide range of functionality for controlling game objects and responding to player input. By using the methods and variables provided by it, you can create complex and engaging gameplay mechanics that will keep your players coming back for more. Remember to keep your code organized, well-documented, and optimized for performance, and you'll be well on your way to creating amazing Unity games and experiences.

You Do Not Have To Do Everything Yourself
Search from thousands of ready-to-use Unity assets.
Visit Asset Store