PackedFloat64Array in Godot – Complete Guide

Diving into the world of game development often means grappling with various data types and how they’re managed. Efficient handling of data is crucial, especially when dealing with aspects like performance and memory usage. In Godot, a powerful and user-friendly game engine, developers have a range of tools at their disposal for such tasks. The PackedFloat64Array is a prime example of Godot’s approach to effective data management. This tutorial will explore the ins and outs of the PackedFloat64Array class in Godot 4, showing you how this specialized array can enhance your game development process.

What is PackedFloat64Array?

The PackedFloat64Array is a specialized class in Godot 4 designed to store 64-bit floating-point values, commonly known as doubles. This array is packed, meaning it’s structured in a way that minimizes memory use without sacrificing the precision of the data it holds. When dealing with large quantities of floating-point data, opting for a PackedFloat64Array can make your game more memory efficient.

What is it for?

A PackedFloat64Array is particularly useful when a game project requires handling high-precision decimal numbers. For example, calculating complex physics, tracking intricate animations, or managing large datasets of in-game statistics can all leverage the precision and efficiency of a 64-bit float array.

Why Should I Learn It?

Mastering the PackedFloat64Array can provide significant benefits:
– **Efficiency**: Keeping your game’s memory footprint low is essential for better performance, especially on devices with limited resources.
– **Precision**: The use of 64-bit floats ensures your game calculations are accurate, leading to a more realistic and professional experience.
– **Flexibility**: Learning to manipulate these arrays adds another tool to your skill set, allowing for more complex and nuanced game features.

Understanding how to implement and utilize the PackedFloat64Array in your Godot projects is a step forward in creating more optimized and sophisticated games. Now, let’s get started with some coding examples to see this class in action.

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Creating and Initializing PackedFloat64Array

To begin working with a PackedFloat64Array in Godot, you first need to know how to create and initialize it. In Godot 4, the syntax is straightforward and user-friendly. Here are some examples illustrating how to create a PackedFloat64Array and initialize it with values.

var my_array = PackedFloat64Array()

This code snippet creates an empty PackedFloat64Array named `my_array`. To initialize it with specific values, you can do so directly:

var my_initialized_array = PackedFloat64Array([1.0, 2.0, 3.14159, 42.0])

The above code snippet initializes a PackedFloat64Array with four 64-bit floating-point values.

Appending Values and Array Size

Once you’ve created your PackedFloat64Array, you may want to add more values to it or check its current size. The following examples demonstrate how to append values and retrieve the array size.

my_array.push_back(5.0)    # Appends a single value
my_array.push_back_array(PackedFloat64Array([6.0, 7.0])) # Appends multiple values from another array

In the first line, we append a single float to `my_array`. The second line shows how to append multiple values coming from another PackedFloat64Array.

To check the size of the array, use:

var size = my_array.size()
print(size) # Outputs the number of elements in my_array

With these operations, you can dynamically modify the array and keep track of its length.

Accessing and Modifying Elements

Reading and updating elements is crucial when working with arrays. Here’s how you can get and set the values in a PackedFloat64Array.

var value = my_array[2]  # Gets the value at index 2
print(value)              # Outputs the value

my_array[2] = 3.14159     # Sets the value at index 2 to a new value

The index-based access provides an easy way to retrieve or alter specific elements within the array.

Erasing Elements and Clearing the Array

There might be situations where you need to remove elements from your PackedFloat64Array or even clear it entirely. Check out the following code examples to see how this can be done.

my_array.remove(1)  # Removes the element at index 1

This line removes the second element in `my_array` (since indices are zero-based). To completely clear the array:

my_array.clear()   # Clears all elements from my_array

After calling `clear()`, `my_array` will be empty, but it can still be reused by adding new elements to it.

These examples cover the basic operations of creating, initializing, and manipulating PackedFloat64Array instances in Godot. As we continue to the next section, we’ll delve into more advanced uses of PackedFloat64Arrays, exploring their versatility and applications in different aspects of game development.Let’s look into more advanced operations involving PackedFloat64Array in Godot 4, providing you with code examples to help you understand and utilize these techniques in your game development journey.

Advanced Operations with PackedFloat64Array

It’s handy to know how to iterate over a PackedFloat64Array and perform actions on each element. Here’s an example using a simple for loop:

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

This loop prints each value along with its index in the array.

You might also want to find the index of a particular value or check if the array contains a value:

var index = my_array.find(3.14159)
if index != -1:
    print("Found value at index: ", index)
    print("Value not found.")

var contains_value = my_array.has(2.0)
print("Contains 2.0: ", contains_value)

With `find()`, you get the index of the first occurrence of the value if it exists; otherwise, it returns -1. The `has()` method returns a boolean indicating whether the value is in the array.

Another useful operation is to insert a new value at a specified index:

my_array.insert(2, 1.61803) # Inserts value 1.61803 at index 2

This code will insert a new floating-point number into `my_array` at the third position.

For computational purposes, you might want to perform bulk operations on the array’s elements, such as adding a constant value to each element:

var increment = 0.5
for i in range(my_array.size()):
    my_array[i] += increment

After running this loop, each element in `my_array` will be increased by 0.5.

Sorting the array may also be needed for various algorithms and gameplay mechanics:

my_array.sort() # Sorts the array in ascending order

The `sort()` method rearranges the array’s elements from lowest to highest.

Finally, converting between different array types is often required when working with various Godot classes and methods:

var int_array = PackedInt32Array(my_array) # Converts to PackedInt32Array, losing precision
var float_array = Array(my_array)              # Converts to a regular Array with variant elements

These conversions create new arrays of different types based on the original PackedFloat64Array.

Understanding how to wield PackedFloat64Array effectively can significantly improve the versatility and calibration of your game systems. From managing precision to dealing with large datasets, these techniques are essential to produce a well-rounded and performance-optimized game. Remember, practice is the key. Experiment with these examples and incorporate them into your Godot 4 projects to see their full potential in action.Integrating PackedFloat64Array figures prominently in various scenarios, like physics calculations or graphical transformations, where precision is paramount. Let’s delve deeper with more code examples that reflect its practical applications.

One common application is using PackedFloat64Array with Godot’s rendering APIs, such as shaders:

# Assuming 'shader_material' is a ShaderMaterial resource
shader_material.set_shader_param("float_array", my_array)

Here, `my_array` is passed to the shader as a parameter. Shaders can benefit from high-precision data for detailed graphical effects.

Another scenario could involve using PackedFloat64Arrays in physics calculations:

# Storing a series of timestamps with double precision
var timestamps = PackedFloat64Array()
timestamps.push_back(OS.get_ticks_msec() / 1000.0)
# ... later on
timestamps.push_back(OS.get_ticks_msec() / 1000.0)

This code snippet demonstrates how you might record timestamps using a PackedFloat64Array for precision timing, such as in a simulation or during complex animation sequences.

For networked games, you might need to compress your array before sending it over the network and then decompress it upon receipt:

var compressed_data = my_array.compress()
# Send compressed_data over the network
# ... then on the receiving end
var decompressed_data = PackedFloat64Array().decompress(compressed_data)

This example illustrates how to compress and decompress a PackedFloat64Array for efficient network transmission, which is particularly important for real-time multiplayer games to save bandwidth and reduce latency.

There are also situations where you might want to perform mathematical operations on array elements. Here we utilize the power of Godot’s built-in Vector2 and Vector3 types in conjunction with PackedFloat64Array for geometric calculations:

var points = PackedVector3Array()
points.push_back(Vector3(1.0, 2.0, 3.0))
points.push_back(Vector3(4.0, 5.0, 6.0))
# Converting Vector3 coordinates into a flat array of doubles
var flat_array = PackedFloat64Array()
for point in points:

This snippet takes a series of 3D points and converts them into a flat array of doubles, which can then be used for more complex 3D computation or sent to shaders as discussed earlier.

Additional manipulations might involve merging multiple arrays. Here’s how to concatenate two PackedFloat64Array objects:

var first_array = PackedFloat64Array([0.1, 0.2, 0.3])
var second_array = PackedFloat64Array([0.4, 0.5, 0.6])
var combined_array = first_array + second_array

The `+` operator merges two PackedFloat64Arrays, resulting in a new array with the elements of both.

Finally, let’s see how to extract a subset of the array, commonly known as slicing:

var sliced_array = my_array.slice(1, 3)
# This will contain elements from index 1 to index 3 (exclusive)

The `slice()` method is used to create a new array that is a subsection of the original, which is particularly useful when you need to handle chunks of data separately.

These examples serve to underscore the vast potential and utility of PackedFloat64Array within the Godot engine. As you build and refine your game, consider these operations to handle complex data with the finesse and precision that modern games demand. Whether it’s for intricate animations, detailed shader effects, or accurate physics, understanding and effectively employing PackedFloat64Array will enhance both your game’s performance and your prowess as a developer.

Continuing Your Game Development Journey

Embarking on your game development journey with Godot 4 may have started with grasping the intricacies of PackedFloat64Array, but the road ahead is filled with even more exciting opportunities to expand your skills. To continue growing as a game developer, we enthusiastically recommend exploring our Godot Game Development Mini-Degree. This thorough collection of courses is tailor-made to guide you through building your own games, covering a breadth of topics from 2D and 3D asset usage to intricate gameplay mechanics across various game genres.

Dive into Zenva’s self-paced, flexible courses to sharpen your proficiency in GDScript and master control flows within your games. Implement player and enemy combat, perfect item collection systems and the user interface, and bring your unique game visions to life, all while building a robust portfolio to showcase your talents. Whether you are a complete novice or a developer seeking to polish your craft, these courses are crafted to meet you where you are and elevate your abilities in the ever-growing game market.

For learners who are hungry to explore more, browse through our vast selection of Godot courses, where a wide array of content awaits to suit all skill levels. At Zenva, we are committed to providing you with the resources you need to go from beginner to professional – one lesson at a time. So why wait? Take the next step in your game development journey with us, and let’s create something incredible together.


As you’ve seen throughout this tutorial, the PackedFloat64Array class is an indispensable asset in the toolkit of a Godot developer. It’s designed to handle your game’s data with precision and efficiency, ensuring that your creations stand out in quality and performance. Remember that learning and mastering such tools not only sharpens your skills but also significantly expands the horizons of what you can achieve within the realm of game development.

Continue to build upon what you’ve learned here and explore the depths of gaming technology with our Godot Game Development Mini-Degree. Every game you create adds a new chapter to your development story, and we’re here to support that journey with our comprehensive curriculum and community. So go ahead, take what you’ve gained from this tutorial and imagine, innovate, and inspire. The world of game creation awaits, and your next big project begins with Zenva.

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