PackedFloat32Array in Godot – Complete Guide

Working with data effectively is a crucial skill for any developer, especially when it comes to game development where performance can directly affect the player experience. Godot Engine provides a variety of data structures to efficiently store and manipulate data, and understanding these structures can greatly enhance your ability to create dynamic and responsive games. One such structure is the PackedFloat32Array, a specialized array for storing 32-bit floating point numbers. Dive into the world of Godot’s packed arrays, and you’ll find yourself with a powerful tool for crafting performant game features.

What is PackedFloat32Array?

PackedFloat32Array is a data structure provided by Godot Engine, more specifically in its updated version, Godot 4. It’s a tightly packed array that’s optimized to store 32-bit floating-point values more efficiently than a regular Array. This packed structure reduces the memory footprint, which is particularly beneficial for large arrays frequently found in game development.

What is it for?

The PackedFloat32Array is typically used when you need to handle large amounts of floating-point data. For example, when dealing with vertex positions in 3D space, physics calculations, or any situation where you might need to process many numbers quickly and with precision.

Why should I learn it?

Understanding how to use PackedFloat32Array can be a significant asset in optimizing your games’ memory usage and performance. By leveraging its capabilities, you can ensure that your game runs smoothly across different devices, including those with limited resources. As our games become more complex, knowing the ins and outs of Godot’s efficient data management systems can make all the difference in both development and gameplay.

In the following sections, we’ll explore how to use PackedFloat32Array through practical examples, illustrating the array’s methods and how they can be applied to common game development tasks. Whether you’re just starting your coding journey or looking to sharpen your already formidable skills, this guide will serve as a valuable stepping stone in your game development endeavors. Let’s get started!

CTA Small Image

Creating and Populating a PackedFloat32Array

Let’s kick off by creating a new PackedFloat32Array and adding some floats to it. You can create a PackedFloat32Array in Godot using the new keyword, and then use the append method to add elements to it.

var my_packed_array =

Now you might want to add multiple floats at once. You can do this via the push_back method which allows the addition of elements in a loop or from another array.

for i in range(4, 7):

# Or directly from an Array
var more_floats = [7.77, 8.88]

By the end of the second code snippet, `my_packed_array` should contain the elements `[1.0, 2.0, 3.14159, 4.0, 5.0, 6.0, 7.77, 8.88]`.

Accessing and Modifying Array Elements

Just like a regular array in Godot, you can access and modify its elements using indices. Remember, Godot arrays are zero-indexed, so the first element is at index 0.

To get the value at a specific index:

var first_element = my_packed_array[0] # This will be 1.0
var fourth_element = my_packed_array[3] # This will be 4.0

To modify an existing index:

my_packed_array[0] = 0.0
# Now the array starts with 0.0 instead of 1.0

Removing Elements from a PackedFloat32Array

There will be times when you need to remove elements from your array. You can remove an element at a specific index using the remove method.

# This will remove the second element which is 2.0

To clear an entire array at once, you can use the clear method.

# Now my_packed_array is empty

Iterating Over PackedFloat32Array Elements

Often you’ll need to iterate over the elements of your array to perform operations on each element. The most common way to do this is through a for loop.

for value in my_packed_array:
# This will print each value in my_packed_array to the output console

Alternatively, you can use a for loop with an index if you need to keep track of index positions.

for i in range(my_packed_array.size()):
    print("Value at index ", i, " is ", my_packed_array[i])

It’s essential to be comfortable with loops and indexing as they are foundational concepts in programming and game development.

In the next section, we’ll dive into some more advanced operations that you can perform on PackedFloat32Array, including sorting and searching for elements. We’ll continue building our knowledge and discovering how Godot’s convenient data structures can help us in creating optimized and powerful games. Stay tuned!Let’s delve further into the advanced operations on `PackedFloat32Array`. These methods are what can really start to differentiate packed arrays from typical arrays because they take full advantage of the memory-efficient data structures provided by Godot.

Sorting a PackedFloat32Array

Sorting is a common requirement, and packed arrays offer a straightforward way to sort your floating-point numbers in ascending order using the `sort` method.

# After sorting, elements are in ascending order

However, suppose you want to check if an array is already in sorted order without modifying it. In that case, you may need to implement your own method to verify the sort order.

func is_sorted(array : PackedFloat32Array) -> bool:
    for i in range(array.size() - 1):
        if array[i] > array[i + 1]:
            return false
    return true

# Check if my_packed_array is sorted
var sorted_check = is_sorted(my_packed_array)
print("Array is sorted: ", sorted_check)

Finding the Sum of All Elements

To find the sum of all elements within a `PackedFloat32Array`, you can loop through and add up each value.

var total = 0.0
for value in my_packed_array:
    total += value

print("Sum of all elements: ", total)

Searching for Elements

If you need to find the index of a particular floating-point value in your array, you can use the `find` method. It will return the index of the first occurrence of the value or -1 if it’s not found.

var index_of_3_14 = my_packed_array.find(3.14159)
print("Index of 3.14159: ", index_of_3_14)

For cases where you want to check if an array contains a certain value, you can use the `has` method which returns a boolean.

var has_value = my_packed_array.has(3.14159)
print("Array contains 3.14159: ", has_value)

Converting Between Arrays and PackedFloat32Arrays

One may often need to convert a standard `Array` to a `PackedFloat32Array`. This can be smoothly done by using the `PackedFloat32Array` constructor directly on the standard array.

var standard_array = [9.0, 10.11, 12.34]
var converted_array = PackedFloat32Array(standard_array)

print("Converted array: ", converted_array)
# This prints: Converted array: [9, 10.11, 12.34]

Conversely, to convert back to a regular array, just call the `array` method.

var regular_array_back = converted_array.array()
print("Regular array: ", regular_array_back)
# This prints: Regular array: [9, 10.11, 12.34]

Working With Sub-arrays

Lastly, you might be interested in working with sub-sections of your array. In this case, you can use the `subarray` method which allows you to specify a range to create a new `PackedFloat32Array`.

var sub_array = my_packed_array.subarray(2, 5)
# Creates a new PackedFloat32Array containing elements from indices 2 to 5
print("Sub-array: ", sub_array)
# This would print a sub-array containing [3.14159, 4.0, 5.0, 6.0] based on our earlier examples

Remember, handling data efficiently can significantly affect the performance of your games, particularly in resource-intensive situations. As we’ve seen throughout these examples, `PackedFloat32Array` offers various methods that make working with floating-point data in Godot both efficient and convenient. It’s an indispensable tool in the arsenal of any Godot developer, particularly those looking to fine-tune their game’s performance. Embrace these data structures, and you will unleash the full potential of your game’s engine.Continuing with our exploration into the `PackedFloat32Array`, let’s consider some practical scenarios where using these operations can be quite beneficial.

Interpolating Values Within an Array

Imagine you have a set of values representing points along a curve or a timeline in your game, and you need to interpolate or calculate the value between these points. The `lerp` (linear interpolation) function comes in handy for smoothly transitioning between values.

First, define a function based on Godot’s built-in `lerp` function to solve for the value at a percentage between two values in the array.

func lerp_value_in_array(array: PackedFloat32Array, index: int, toward_next: float) -> float:
    var current_val = array[index]
    var next_val = array[min(index + 1, array.size() - 1)]
    return lerp(current_val, next_val, toward_next)

# Example usage
var interpolated_value = lerp_value_in_array(my_packed_array, 1, 0.5)

The above code will find the halfway point between the second and third elements in `my_packed_array`.

Applying a Function to Each Element

There might be cases where you want to apply a specific operation to every element, like adjusting the scale of some measurement. Godot’s scripting language is dynamic, so you can pass a function as an argument to another function to accomplish this.

func apply_function_to_array(array: PackedFloat32Array, func) -> PackedFloat32Array:
    for i in range(array.size()):
        array[i] = func(array[i])
    return array

# Suppose we want to double every value in the array
func double_value(value):
    return value * 2

var updated_array = apply_function_to_array(my_packed_array, double_value)

Each element of `my_packed_array` will be doubled using the custom `double_value` function we defined.

Combining Arrays

Another common need is to combine two `PackedFloat32Array` instances into one. This may be used to merge datasets or to concatenate attribute lists for geometry in 3D modeling.

var another_packed_array = PackedFloat32Array([20.2, 30.3, 40.4]) 

After this code is executed, `my_packed_array` will contain the original values plus `[20.2, 30.3, 40.4]`.

Reverse the Array

Reversing the order of elements is another handy operation that could be used in game mechanics or data visualization.


The `invert` method will reverse the order of the elements in-place.

Continuing to stretch our use of `PackedFloat32Array`, consider the scenarios where we may need advanced data manipulation. For example, calculating distance metrics, transforming data points for procedural generation, or managing resource buffers. With each of these operations, think about the potential performance benefits when dealing with thousands or millions of data points in real-time applications. Using Godot’s `PackedFloat32Array` can lead to significant improvements in handling such intensive tasks, keeping your games running efficiently and your code neat and manageable.

Where to Go Next with Your Godot Learning Journey

You’ve now grasped the essentials of using `PackedFloat32Array` in Godot to handle and optimize your game’s data. However, the path to mastering Godot and game development is an ongoing adventure. To keep expanding your knowledge and skills, why not take the next step with our Godot Game Development Mini-Degree? This comprehensive collection of courses is meticulously designed to cover a wide range of topics, from the basics to more complex game mechanics.

Whether you’re just starting out or looking to level up your game development expertise, the Mini-Degree provides a structured and project-based curriculum that will help build your portfolio and cement your understanding of Godot and its powerful capabilities. Godot’s free, open-source nature and our flexible course structure mean that you can learn at your own pace and achieve your game development dreams.

For those who wish to explore more varied content, our full range of Godot courses caters to all levels. Dive into specific topics or techniques that pique your interest, and continue to build that game developer’s toolkit. Each course is designed to provide hands-on experience, ensuring that you can apply what you’ve learned to your own projects. With Zenva, go from beginner to professional, and turn your passion for game development into a reality.


That wraps up our journey into the efficient world of `PackedFloat32Array` in Godot. We’ve covered creation, manipulation, and some sophisticated applications that can be used to optimize your games to their finest. This knowledge is just the beginning; imagine the complex systems you can build and the top-notch games you can craft with these data structures at your fingertips.

Now, it’s your turn to take the reins and steer your game development voyage to new horizons with our Godot Game Development Mini-Degree. Let this be the catalyst for your creativity and the foundation for crafting engaging experiences for players worldwide. We at Zenva are excited to see the exceptional games you’ll create, and we’re here to support you at every step. Happy developing!

Python Blog Image

FINAL DAYS: Unlock coding courses in Unity, Godot, Unreal, Python and more.