Level up your game with Godot's Chance-Based Random Picker!

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Level up your game with Godot's Chance-Based Random Picker!

Table of Contents:

  1. Introduction
  2. What is a rarity-based random system?
  3. Applications of rarity-based random systems
    1. Item drop rarity
    2. Generating random events
    3. State generation in games
  4. Implementing a rarity-based random system in Godot
    1. Creating a new scene and saving it
    2. Describing the algorithm
    3. Creating a custom resource for the random item
    4. Creating a random picker system
    5. Writing the "pick random item" function
    6. Testing the system in Godot
    7. Using the random picker in code
  5. Conclusion

Implementing Rarity-Based Random Systems in Godot

Rarity-based random systems are widely used in games like Dungeons and Dragons and many others. These systems allow for the implementation of item drop rarity, random events, and state generation. In this article, we will explore how to implement such a system in Godot.


When it comes to creating exciting and dynamic gameplay experiences, randomness plays a vital role. Random events, item drops, and state generation add an element of surprise and unpredictability to games. One common approach to implement randomness in games is through rarity-based random systems. These systems determine the likelihood of certain outcomes based on their rarity.

What is a Rarity-Based Random System?

A rarity-based random system is a mechanism that assigns specific probabilities to different outcomes based on their rarity. For example, in a game with item drops, some items may be common and have a higher chance of dropping, while others may be rare and have a lower chance. This allows game developers to control the distribution of items or events, ensuring a balanced gameplay experience.

Applications of Rarity-Based Random Systems

Rarity-based random systems have various applications in game development. Some of the most notable applications include:

1. Item Drop Rarity

In games with an emphasis on loot and item collection, rarity-based random systems are crucial for determining the likelihood of obtaining different types of items. For example, legendary items may have a very low drop rate, providing an extra layer of excitement and challenge for players.

2. Generating Random Events

Random events can add depth and variation to gameplay. By using a rarity-based random system, game developers can control the occurrence of these events. Whether it's encountering rare monsters or stumbling upon hidden treasures, random events keep players engaged and eager to explore the game world.

3. State Generation in Games

In certain games, the initial state or setup of the game world can have significant implications for gameplay. Rarity-based random systems can be used to determine the rarity of various elements in the game world, such as rare resources, unique characters, or rare occurrences. This adds a sense of discovery and uniqueness to each playthrough.

Implementing a Rarity-Based Random System in Godot

Now that we understand the concept and applications of rarity-based random systems, let's explore how to implement one in Godot. Here's a step-by-step guide:

1. Creating a New Scene and Saving It

To start, open Godot and create a new scene. Save it with a descriptive name.

2. Describing the Algorithm

Before diving into the implementation, it's essential to understand the algorithm that drives the rarity-based random system. At its core, the system consists of an array that contains items with specific values and peak chances.

3. Creating a Custom Resource for the Random Item

In Godot, we can create a custom resource to represent the random item. This resource should have variables for value, peak chance, and the capability of being picked.

4. Creating a Random Picker System

Next, we need to create a random picker system, which will act as a node in Godot. This system will hold an array of items and provide a function to pick a random item based on its rarity.

5. Writing the "Pick Random Item" Function

Within the random picker system, we'll write a function called "pick random item." This function calculates the overall peak chance, generates a random number within the range, finds the item according to the drop range, and returns its value.

6. Testing the System in Godot

After completing the implementation, it's crucial to test the system to ensure it works as intended. Manipulate the peak chances of various items to observe different outcomes.

7. Using the Random Picker in Code

Besides using the random picker as a node in the Godot scene, you can also utilize it in code. Instantiate the random picker and call the "pick random item" function, passing the desired array of items.


Rarity-based random systems add excitement and variety to games by implementing randomness effectively. In this article, we explored the concept of rarity-based random systems, their applications, and how to implement them in Godot. By following the step-by-step guide, you can create engaging gameplay experiences with balanced item drops, random events, and unique game states.

Remember, implementing a rarity-based random system requires careful consideration of the game design, balancing, and the player experience. With the knowledge gained from this article, you can now confidently integrate these systems into your own game projects.

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