VisualShaderNodeParticleRandomness in Godot – Complete Guide

Welcome to a journey through the intriguing world of particle randomness in Godot 4. Today, we’re going to explore the capabilities of the VisualShaderNodeParticleRandomness class—a powerful tool in your game development arsenal for creating dynamic and visually appealing particle systems. Whether you’re just starting out or looking to expand your technical toolkit, understanding how to manipulate particle randomness can elevate your game designs to new heights. So, grab your virtual lab coats; we’re about to experiment with some unpredictable visual magic!

What Is VisualShaderNodeParticleRandomness?

The VisualShaderNodeParticleRandomness is a component within the Godot 4 engine used to introduce a level of unpredictability into particle systems. This node generates pseudo-random values within specified ranges, offering the flexibility to alter the behavior and appearance of particles in real-time.

What Is It For?

The randomness node is used to create randomized effects in particles, such as varying velocities, colors, sizes, or any attribute you wish to have a non-uniform distribution. The application of randomness can make particle systems appear more natural and less repetitive.

Why Should I Learn It?

Utilizing randomness in particle systems can dramatically enhance your game’s visual fidelity. Learning how to manipulate these nodes enables you to create engaging effects that can captivate players and bring your virtual worlds to life. Plus, mastering this form of visual coding is a stepping stone to more sophisticated graphical programming techniques in Godot and other game engines.

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Creating a Basic Particle System in Godot

To begin with, let’s set up a basic particle system in Godot. We’ll start by adding a ParticleSystem node to our scene:

var ps =

Once you have your Particles node, you need to define its properties. Here’s a snippet configuring some of the main aspects like the number of particles, lifetime, and emitting status:

ps.amount = 100
ps.lifetime = 1.0
ps.emitting = true

With the system prepared, we need to create a ParticlesMaterial to handle how our particles will look and behave:

var material =

Introducing Randomness using Randomness Ratio

Now that we have the foundation, we can introduce randomness to various properties of the particles. Let’s start by adding some randomness to the initial velocity of each particle using the randomness_ratio property:

material.initial_velocity = 10
material.initial_velocity_random = 0.5

The `initial_velocity_random` property here means each particle’s velocity will vary by ±50% of the `initial_velocity`, creating a more natural look.

Adding Randomness to Color and Scale

A common technique to enhance visual complexity is to randomize color and scale. Let’s tweak our particles’ color over their lifetime:

material.color = Color(1, 0, 0, 1)  // Red color
material.color_random = 0.5               // 50% color randomness

Now, to make the particles vary in size, you alter the scale property similarly:

material.scale_amount = 1.0
material.scale_amount_random = 0.3

This code will give each particle a scale that can vary by ±30% of the `scale_amount`.

Randomized Angular Velocity

Particles often need to rotate over time to simulate natural phenomena like leaves in the wind. We’ll randomize the angular velocity to achieve this:

material.angular_velocity = 2
material.angular_velocity_random = 0.6

In this case, we’re setting the `angular_velocity` and allowing it to vary by ±60% between particles.

By including a mix of these techniques, you’ll have a potent starting point for creating visually dynamic particle systems in Godot. These examples are just the beginning; as you delve deeper, you’ll discover a vast range of possibilities that randomness unlocks in your game’s aesthetics. Stick around as we continue to expand upon these examples in the next part of our tutorial!Continuing our exploration of the VisualShaderNodeParticleRandomness, let’s delve into how we can make our particles’ movement more dynamic using the randomness feature.

Randomizing Direction

Firstly, manipulating the direction in which particles travel can create a compelling visual effect, especially useful for simulating random wind patterns or explosions. We’ll adjust the direction using the spread property and introduce randomness:

material.spread = 45
material.spread_random = 0.3

Here, particles will emerge within a 45-degree angle, and the direction of each particle will vary by ±30% of that angle.

We can also apply randomness to the particle’s initial position to simulate a broader area of effect:

material.emission_box_extents = Vector3(1.0, 1.0, 0)
material.emission_box_extents_random = Vector3(0.5, 0.5, 0)

This will make particles to appear within a box and vary their initial positions within that space significantly.

Animating Particles with Random Lifetime

Animating the lifetime of each particle can make your system seem less uniform and more lively. To do this, we’ll make the lifetime of each particle slightly different:

material.lifetime_randomness = 0.4

With this property, a particle’s lifetime will vary by ±40% of the base lifetime you’ve set, adding a more organic flow to their existence.

Gravity and Randomness

To simulate physical forces, we can introduce randomness to the gravity effect:

material.gravity = Vector3(0, -9.81, 0)
material.gravity_random = 0.3

Now, each particle will fall at different rates, creating an uneven descent that mimics real-life variance under gravitational influence.

Randomizing Custom Parameters

Godot also allows us to introduce randomness to custom parameters, letting us create utterly unique particle behaviors:

material.set_shader_param("custom_param", 5)
material.set_shader_param_randomness("custom_param", 1)

Adjusting the `custom_param` with randomness can result in endless possibilities, especially when combined with a custom shader script that makes use of that parameter.

By incorporating these examples of randomness into your particle systems, you’re taking your Godot 4 particle effects to a whole new level of sophistication and natural complexity. Remember, the key to impressive visual effects is fine-tuning these parameters to fit the theme and context of your game. With a firm grasp on these techniques, you’re well on your way to mastering particle systems in Godot. Keep experimenting with different combinations to craft particle effects that truly stand out!Enhancing your skills with particle systems in Godot is not only about understanding the properties but also about knowing how to effectively tie them together to create complex, engaging visual effects. Let’s continue with more elaborate examples of how we can use VisualShaderNodeParticleRandomness to drive our particle effects to the next level of realism and creativity.

Advanced Particle Randomization Techniques

Imagine we want to simulate a campfire. A fire’s flames flicker and move in unpredictable ways, not just in intensity but also in color and distribution. To achieve this effect, we’ll add randomness to several parameters:

material.color = Color(1, 0.5, 0, 1)  // Orange-Red color for flames
material.color_random = 0.2                // Slight color variation for flicker effect

material.initial_velocity = 3
material.initial_velocity_random = 0.75    // High velocity variance for dynamic flames

material.direction = Vector3(0, 1, 0)
material.spread = 15                       // Narrow spread for upward flame motion
material.spread_random = 0.4

material.scale_amount = 2
material.scale_amount_random = 0.5         // Random scale for varied flame sizes

These settings will start to bring our campfire to life, but to fully capture the essence of fire we need more randomness, including the way particles die out.

material.fade_out = true
material.fade_out_randomness = 0.3         // Random fading for a more natural look

Fade-out randomness ensures each flame particle dims at varying rates, reminiscent of real flames that intensify and die down randomly.

Next, let’s add an animated randomness to simulate embers rising from the fire:

material.angular_velocity = 0.2
material.angular_velocity_random = 1.0     // Full variability for ember twirls

material.emission_box_extents = Vector3(0.5, 0.2, 0.5)
material.emission_box_extents_random = Vector3(1, 0, 1)  // Embers emerge randomly around the fire

This angular velocity randomness will cause some particles to spin wildly while others remain relatively steady, just like embers caught in the updraft of a fire.

We also need to consider the lifespan of each ember to finish our campfire scene:

ps.lifetime = 4
ps.lifetime_randomness = 0.5              // Embers have shorter and longer lives

This variation in lifetime will ensure some embers fizzle out quickly, while others linger for longer.

Remember that these are just examples of what you can achieve with VisualShaderNodeParticleRandomness. Depending on the effect you’re trying to create—whether it’s sparks from a welder’s torch, snowflakes in a blizzard, or bubbles underwater—you can adjust these properties to perfectly fit the scene.

Mastering Godot’s particle system requires time, patience, and experimentation. We encourage you to play with the values and properties, blending different randomness ratios to distill the ideal visual effect for your game. With practice, you’ll find that your proficiency with these techniques will not just improve the aesthetics but also the immersive quality of your projects. So have fun, and let your creativity soar with Godot’s particle systems!

Where to Go Next in Your Godot Learning Journey

Congratulations on diving into the world of particle systems in Godot! You’ve taken a significant step towards enriching your games with captivating visual effects. Your next challenge is to apply and expand upon these skills. One of the best ways to do that is by continuing your education through practice and structured learning.

We recommend exploring our Godot Game Development Mini-Degree, where you can delve deeper into the world of Godot 4 and turn your newfound knowledge into practical, portfolio-worthy projects. Our courses cover a wide range of topics that will help bolster your game development skills, from mastering GDScript and mastering 2D and 3D game creation to understanding in-depth gameplay mechanics. With a flexible, project-based approach, you can learn at your own pace and around your own schedule, making it perfect for all levels of experience.

If you’re looking for an even broader collection of resources, our array of Godot courses offers a wealth of knowledge just a click away. Each course is designed to guide you through the essential steps, whether you’re a beginner or looking to polish your professional skills. By embracing these learning paths, you’re well on your way to becoming a proficient Godot developer, capable of crafting games that not only look great but play great as well. Let’s continue the journey together with Zenva, and transform your passion for game development into tangible success.


Embarking on the path of mastering particle systems in Godot opens up a universe of creativity for your games. The rich tapestry of randomness and the vast control you can exert over particles are what set Godot’s engine apart, allowing you to breathe life into your virtual environments. Always remember, the beauty of game development lies within this experimentation and the unique touch that only you can provide to your creations. We, at Zenva, are excited to be part of your journey, providing you with the tools, knowledge, and support you need to turn your game development dreams into reality.

Are you ready to take your skills to the next level and create your own stunning particle effects? Join us on the Godot Game Development Mini-Degree, and let’s continue shaping your future in game development, one node at a time. Dive into our comprehensive courses and transform your potential into expertise with Zenva. Let the adventures begin!

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