FastNoiseLite in Godot – Complete Guide

Welcome to the captivating world of procedural generation with FastNoiseLite in Godot 4! Procedural generation has become a cornerstone in game development, giving creators the ability to forge vast, dynamic and intricate worlds with less manual effort. Diving into this realm can be thrilling, as it paves the way for crafting environments that are as limitless as one’s imagination.

What is FastNoiseLite?
FastNoiseLite is a powerful noise generation library that has been integrated into Godot 4, making it an accessible tool for developers. It encompasses a variety of noise algorithms, such as Cellular, Perlin, Value, and more. Each of these algorithms can help create different textures and patterns, from the rolling hills of a landscape to the speckled pattern of a starry sky.

What is it for?
The applications of FastNoiseLite extend far beyond mere background textures. This versatile tool can be used to generate terrain, model weather patterns, create random enemy movements, and so much more. Understanding how to manipulate noise can level up one’s game development skills significantly.

Why should I learn it?
Grasping FastNoiseLite and the concepts of noise in Godot opens a door to endless possibilities in game creation. Not only does it provide a foundation for more advanced procedural generation techniques, but it also allows even beginners to add a depth of complexity and detail to their game worlds that would otherwise require extensive manual effort. Let’s embark on this journey to unlock the potential of noise generation and propel our game development skills to new heights!

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Creating a Basic Noise Texture with FastNoiseLite

To get started with FastNoiseLite for procedural generation in Godot 4, we’ll first create a basic noise texture. This texture can be applied as a base for terrain, clouds, or any other randomly generated patterns in your game.

var noise =
var image =
var size = Vector2(100, 100)

image.create(size.x, size.y, false, Image.FORMAT_RF)

for x in range(size.x):
    for y in range(size.y):
        var value = noise.get_noise_2d(x, y)
        image.set_pixel(x, y, Color(value, value, value))


var texture =


This code snippet sets up a simple FastNoiseLite object and creates a grayscale noise texture of size 100×100. The loop goes through each pixel and applies a noise value to it, effectively creating a basic noise texture.

Modifying Noise Parameters

FastNoiseLite allows you to modify various parameters that affect the appearance of the generated noise. For example, you can set the noise type, frequency, and octaves to create more complex patterns.


By setting different types of noise, such as NOISE_PERLIN, you can create smoother, more natural-looking textures. The frequency adjusts the “zoom” of the noise, while octaves control the detail level in the noise.

Tweaking Noise for Different Effects

Different effects can be achieved by further tweaking the noise settings. For instance, you can modify the seed for random variations, or use a combination of noises for more sophisticated results.


var hybrid_noise = noise.get_noise_2d(x, y) * 0.6 + noise.get_noise_2d(x * 2, y * 2) * 0.4
image.set_pixel(x, y, Color(hybrid_noise, hybrid_noise, hybrid_noise))

The first line sets a random seed for the noise generation, ensuring different patterns each time the game runs. The second line shows how a hybrid noise is created by combining two noises with different scaling, producing a richer texture.

Applying Noise to 3D Terrain

One common application of FastNoiseLite is to generate 3D terrain. Below is a basic example of using noise data to modulate the height of a 3D grid to create a terrain shape.

var terrain =

for z in range(size.z):
    for x in range(size.x):
        var height = noise.get_noise_2d(x, z) * 10
        terrain.add_vertex(Vector3(x, height, z))

# Continue with the rest of your mesh generation...

This code generates a grid where each vertex is displaced on the Y axis based on the noise value, which effectively creates a wavy terrain. The multiplier adjusts the amplitude of the waves, controlling how steep the terrain features will be.

In the next part of the tutorial, we’ll delve into how to apply noise to generate more detailed textures, simulate clouds, and create random item placement. Stay tuned as we explore the full potential of FastNoiseLite in Godot 4 for your games!

Now that we’ve covered basic noise generation and terrain modulation, we’ll expand our understanding by applying noise to create more detailed textures and systems. Let’s dive into more examples where FastNoiseLite can bring life to various game elements.

Leveraging noise to simulate clouds in a 2D game can give the sky dynamic and evolving visuals. Here’s an example of how you can accomplish such an effect:

for x in range(size.x):
    for y in range(size.y):
        var noise_value = noise.get_noise_2d(x, y)
        var alpha = noise_value > 0.5 ? 1.0 : 0.0  # Make clouds appear based on a threshold
        image.set_pixel(x, y, Color(1, 1, 1, alpha))

By setting a threshold for the noise value, you can create patches that are either fully transparent or fully opaque, representing cloud distribution in the sky. Adjusting the threshold controls the density of the clouds.

It’s also possible to create more complex cloud patterns by layering different noise scales:

var base_noise = noise.get_noise_2d(x, y) * 0.7
var detail_noise = noise.get_noise_2d(x * 5, y * 5) * 0.3
image.set_pixel(x, y, Color(1, 1, 1, base_noise + detail_noise))

This snippet creates a base layer of cloud patterns and adds a smaller, more detailed layer on top, yielding more realistic and less uniform clouds.

FastNoiseLite can also handle the procedural generation of item placements or vegetation. Here’s an example of how to randomly place items like trees on a map:

for i in range(num_items):
    var x = rand_range(0, map_size.x)
    var y = rand_range(0, map_size.y)
    var noise_value = noise.get_noise_2d(x, y)

    if noise_value > 0.7:  # High noise values indicate where to place trees
        create_tree_at_position(Vector2(x, y))

In this example, we use noise values to decide whether a tree should be placed at a given location, adding variety and natural appearance to the distribution of trees.

We should also consider how to modulate these techniques for creating randomness in enemy behavior or spawn rates:

var enemy_spawn_chance = noise.get_noise_2d(enemy.x, enemy.y)

if enemy_spawn_chance > 0.8:
    spawn_enemy_at(enemy.x, enemy.y)

Here, noise controls the likelihood of enemy spawn at a position, which could be tied to certain areas of the map feeling more dangerous due to higher enemy density.

Lastly, FastNoiseLite can support the generation of cave-like structures or topology within a 3D space. Below is a simplified method for carving out a cave system:

var cave_map = []

for z in range(size.z):
    for x in range(size.x):
        var noise_value = noise.get_noise_3d(x, 20, z)  # Using a fixed Y value as a "depth"
        cave_map[z].push_back(noise_value > 0.5)  # If true, it's a solid block; if false, it's air

This script forms a 3D grid where each point’s occupancy is determined by the noise value, creating solid and empty spaces indicative of a cave network.

FastNoiseLite in Godot 4 introduces an incredible suite of features to enhance the procedural aspects of game development. By experimenting with noise and its parameters, you become equipped to produce rich, dynamic games filled with captivating and seemingly endless variety.

As we’ve seen in these examples, the creative applications are virtually limitless. It’s all about exploring the possibilities and finding the right balance to forge unique game worlds that engage and immerly our gamers. Keep playing with FastNoiseLite, and you’ll be amazed by the worlds you can build!

Building on our previous examples, let’s delve further into the application of FastNoiseLite in Godot 4, presenting more intricate and practical uses that can enhance your game development projects.

Imagine creating a river system that flows through your terrain. The following code could simulate the paths where water might flow over a landscape:

for z in range(size.z):
    for x in range(size.x):
        var height = terrain.get_vertex(x, z).y
        var moisture = noise.get_noise_2d(x * 0.1, z * 0.1)
        if height  0.3:
            create_water_at_position(Vector3(x, water_level, z))

We examine the height of the terrain and then use a different scale of noise for moisture. Where both conditions meet, a river or stream is formed, giving the effect of water cutting through the landscape.

Dynamic weather patterns can also be simulated using noise. As an example, the following code can influence the density of a fog effect:

var fog_density = []
for z in range(size.z):
    for x in range(size.x):
        fog_density[z].push_back(noise.get_noise_2d(x * 0.2, z * 0.2))

The fog density is modulated across the map by noise values, resulting in areas with thicker or lighter fog, thus creating a more realistic and variable atmosphere.

Adding a random factor to AI can create unpredictable and challenging gameplay. Here’s how noise can be used to decide whether an AI should attack or defend:

var behavior = noise.get_noise_2d(ai.position.x, ai.position.y)
if behavior > 0.5:

The behavior is determined by the noise value at the AI’s position, encouraging diverse responses from AI characters and enhancing the gameplay experience.

FastNoiseLite can also assist in creating heightmaps for textures on 3D models, providing them with more detailed and realistic surfaces:

var heightmap =
heightmap.create(size.x, size.z, false, Image.FORMAT_RF)

for x in range(size.x):
    for z in range(size.z):
        var height = (noise.get_noise_2d(x, z) + 1) * 0.5  # Normalizing to 0 - 1 range
        heightmap.set_pixel(x, z, Color(height, height, height))

By normalizing the noise values, we’re able to use them directly as height values for a grayscale heightmap that can be used as a bump map or displacement map in your 3D materials.

Lastly, we can use noise to erode terrain realistically over time, simulating natural processes like wind or water erosion:

for z in range(size.z):
    for x in range(size.x):
        var erosion = noise.get_noise_2d(x, z) * erosion_strength
        var height = terrain.get_vertex(x, z).y
        terrain.set_vertex(x, z, Vector3(x, height - erosion, z))

The erosion value subtracted from the height of each vertex gradually changes the terrain’s shape. Over time, with different noise settings, you can simulate years of natural erosion in seconds and create realistic-looking landscapes.

As you experiment with FastNoiseLite and its possibilities, we encourage you to blend these examples and push the boundaries of procedural generation within your games. Each noise function and parameter you adjust brings a new dimension to the game environments, making them feel vibrant and alive.

Remember, procedural generation is both an art and a science, so keep iterating on your creations until you achieve the desired effect. With FastNoiseLite, the right formula can lead to mesmerizing results that will captivate your players and leave them in awe of the immersive worlds you create.

Continuing Your Game Development Journey

Your foray into procedural generation with FastNoiseLite is just the beginning of an exhilarating path in game development with Godot 4. If you’re eager to expand your skill set and continue to grow as a game creator, our Godot Game Development Mini-Degree provides an in-depth exploration of game development that will guide you from the basics to building complete games.

By joining the Mini-Degree, you will dive into the realms of both 2D and 3D game development, mastering the versatile engine through a series of projects that cover a wide array of game genres and mechanics. Whether you want to craft an RPG with immersive storytelling, an action-packed platformer, or a strategic RTS, our curriculum is designed to support you at every step of your learning adventure. To start elevating your game development proficiency with our Mini-Degree, check it out here.

For an even broader selection of content, we invite you to explore our full collection of Godot courses. These resources are tailored to fit your schedule and learning pace, allowing you to build a professional portfolio and gain the crucial skills that can propel you into a career in game development. Take the next step with us at Zenva, and let’s create something extraordinary together!


Armed with the power of FastNoiseLite and Godot 4, you’re now equipped to bring an imaginative flair to your games through procedural generation. Remember, the worlds you craft and the experiences you design are only as boundless as your creativity. Embrace the challenges, experiment with noise, and watch as your digital landscapes transform with life and detail.

Continue your game development journey with our Godot Game Development Mini-Degree, where you can refine your skills and turn your visions into reality. With every line of code and artistic touch, you are crafting the next exciting adventure for players around the world. If you’re ready to take the leap into advanced game creation, join us at Zenva Academy and let’s bring your game to life!

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