VisualShaderNodeClamp in Godot – Complete Guide

When delving into game development, understanding the various nodes within game engines like Godot 4 can greatly enhance your control over game dynamics and visuals. One such vital aspect is manipulating shader values, which is crucial for creating compelling visual effects. Enter the VisualShaderNodeClamp, a flexible tool in Godot’s shading environment that helps prevent values from going over or under specified limits. This seemingly simple concept has profound implications, from creating more predictable visual outcomes to avoiding graphical glitches. As you learn about this functional node, you’ll see how essential it is for any game developer’s toolkit.

What is VisualShaderNodeClamp?

VisualShaderNodeClamp is a feature in the Godot 4 engine, in the realm of visual shaders. Shaders provide the groundwork for profoundly dynamic visual elements in games. The Clamp node serves a pivotal role in this visual scripting environment, ensuring that your shader values don’t exceed a specified range.

What is it for?

Clamping is used to constrain a value, whether a scalar or a vector, within a designated range determined by minimum and maximum boundaries. This is particularly useful in visual shaders where values outside a certain range may produce undesirable effects or exceed practical limits.

Why Should I Learn It?

Understanding how to use the VisualShaderNodeClamp can help you:

– Control visual effects more precisely.
– Prevent errors caused by values falling outside of expected limits.
– Expand your knowledge of shaders, which are essential in high-quality game visuals.

Moreover, it’s a testament to the comprehensive nature of Godot’s visual tools, enabling both novice and veteran coders to enhance the fidelity and performance of their games.

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Setting Up the Visual Shader

Creating a visual shader in Godot 4 starts with a simple setup. First off, you’ll need to create a new shader material and then select ‘VisualShader’ as the shader type.

var material =
var shader =
material.shader = shader

Once you’ve created a VisualShader, it’s time to add nodes that will define its functionalities.

Adding the VisualShaderNodeClamp

To insert a VisualShaderNodeClamp into your shader graph, you’ll need to instantiate it and then add it to the VisualShader.

var clamp_node =
shader.add_node(clamp_node, Vector2(100, 150))

This places the node at coordinates (100,150) on the graph. Now, you can start connecting it with other nodes to define its input and output behaviour.

Connecting Nodes for Desired Effects

Connecting the Clamp node in the visual shader graph is straightforward. Let’s assume you want to use it on a texture’s red channel. You’ll need a Texture node, an output node, and possibly a scalar to define the min and max parameters of the Clamp node.

// Create necessary nodes
var texture_node =
var output_node =

// Set the texture node to use the red channel
texture_node.source = VisualShaderNodeTexture.SOURCE_TEXTURE_RED

// Add nodes to the shader
shader.add_node(texture_node, Vector2(50, 150))
shader.add_node(output_node, Vector2(250, 150))

// Connect red channel to the clamp input
shader.node_connect(texture_node, "rgb", clamp_node, "input")

// Now, connect the clamp output to the shader output
shader.node_connect(clamp_node, "output", output_node, "color")

Adjusting Clamp Parameters

The VisualShaderNodeClamp node has ‘min’ and ‘max’ parameters that determine the clamping range. You can set these parameters directly in code, which allows dynamic changes during runtime.

// Set minimum and maximum clamping values
clamp_node.min_value = Vector3(0.2, 0.2, 0.2) // This is a Vector3 since the VisualShader works with RGB, but it could be a scalar as well
clamp_node.max_value = Vector3(0.8, 0.8, 0.8)

// Alternatively, create parameter nodes to allow dynamic adjustment
var min_param =

var max_param =

// Add parameters to shader and connect
shader.add_node(min_param, Vector2(50, 50))
shader.add_node(max_param, Vector2(50, 250))
shader.node_connect(min_param, "output", clamp_node, "min")
shader.node_connect(max_param, "output", clamp_node, "max")

With these nodes and parameter adjustments, you’re starting to utilize the power of VisualShaderNodeClamp, giving direct control over how the texture’s red channel values are being manipulated in real-time within the shader. This just scratches the surface, but it already lays a foundation for more complex visual effects.In game development, understanding how to manipulate shader values is key to creating rich visual effects. With our walkthrough of the VisualShaderNodeClamp in Godot 4, we’ve set the stage for more complex applications. Let’s continue with additional code examples to illustrate the flexibility and power of this valuable node in your shaders.

Animating Values with VisualShaderNodeClamp

One exciting application of the VisualShaderNodeClamp is animating the clamped values to create dynamic effects. By modifying the min and max parameters over time, you can create animations directly within your shader.

// Assuming you have a timer or some animation value that changes over time
var animation_value = 0.5 // This would normally be dynamic

// Animating the min_value of the clamp
clamp_node.min_value = Vector3(animation_value, 0.0, 0.0)

// Keep max_value static in this example
clamp_node.max_value = Vector3(1.0, 1.0, 1.0)

The animated clamp values provide a way to control transitions or effects based on game events or player actions.

Combining Multiple Clamps

Sometimes, you may want to clamp different vectors or scalars before combining them. Here’s how you can combine two clamped texture channels to make an interesting effect:

// Create two clamp nodes for different texture channels
var clamp_node_r =
var clamp_node_g =

// Set min and max for red channel
clamp_node_r.min_value = Vector3(0.2, 0.0, 0.0)
clamp_node_r.max_value = Vector3(0.5, 0.0, 0.0)

// Set min and max for green channel
clamp_node_g.min_value = Vector3(0.0, 0.2, 0.0)
clamp_node_g.max_value = Vector3(0.0, 0.5, 0.0)

// Assuming you have red and green channel nodes set up
// Add clamp nodes to shader
shader.add_node(clamp_node_r, Vector2(150, 100))
shader.add_node(clamp_node_g, Vector2(150, 200))

// Connect the texture nodes to clamps and then combine both
shader.node_connect(texture_node_r, "rgb", clamp_node_r, "input")
shader.node_connect(texture_node_g, "rgb", clamp_node_g, "input")

// Use a VectorOp node to combine the outputs
var vec_op_node =
vec_op_node.operation = VisualShaderNodeVectorOp.OPERATION_ADD

// Add and connect the operation node
shader.add_node(vec_op_node, Vector2(300, 150))
shader.node_connect(clamp_node_r, "output", vec_op_node, "a")
shader.node_connect(clamp_node_g, "output", vec_op_node, "b")

// Then connect the result to the output
shader.node_connect(vec_op_node, "output", output_node, "color")

Using multiple clamps and combining their outputs can create sophisticated layering and effects that could be tricky to achieve otherwise.

Adding User Controls with Uniforms

To give more control to the designers or the players, you might want to expose the clamp parameters as uniforms. This way, they can be adjusted from the material properties in the editor or at runtime through code.

// Create scalar uniform nodes for min and max
var min_uniform =
var max_uniform =

// Provide names for the uniforms
min_uniform.uniform_name = "min_clamp_value"
max_uniform.uniform_name = "max_clamp_value"

// Add the uniform nodes to the shader
shader.add_node(min_uniform, Vector2(50, 50))
shader.add_node(max_uniform, Vector2(50, 100))

// Connect the uniforms to the clamp node
shader.node_connect(min_uniform, "output", clamp_node, "min")
shader.node_connect(max_uniform, "output", clamp_node, "max")

// The uniforms can now be edited from the Godot editor or through code:
material.set_shader_param("min_clamp_value", 0.1)
material.set_shader_param("max_clamp_value", 0.9)

These uniforms act as dynamic inputs for the shader that can be key in tweaking visual effects for different scenarios or personalizing them per user preferences.

By incorporating these code snippets into your shader development workflow, you’ve expanded what’s possible in terms of visual output and customization. Whether you’re looking to create subtle visual transitions, eye-catching effects or seeking ways to provide user-driven customization, the VisualShaderNodeClamp in Godot 4 provides a robust solution. Embrace this node, and you’re well on your way to constructing visually stunning and interactive experiences in your games.Adding depth to the usage of the VisualShaderNodeClamp can lead to even richer visual outputs. Let’s explore more intricate scenarios where clamp nodes play a crucial part in achieving advanced effects.

Using VisualShaderNodeClamp with Light

Shading isn’t just about textures; it’s also about how light interacts with surfaces. Let’s use the clamp node to modify the intensity of the light reflection:

// First, create a light node
var light_node =

// Create a clamp node for the light output
var light_clamp =
light_clamp.min_value = Vector3(0.0, 0.0, 0.0) // No negative light
light_clamp.max_value = Vector3(0.8, 0.8, 0.8) // Avoid overexposure

// Add nodes to shader
shader.add_node(light_node, Vector2(100, 300))
shader.add_node(light_clamp, Vector2(300, 300))

// Connect nodes
shader.node_connect(light_node, "light", light_clamp, "input")
shader.node_connect(light_clamp, "output", output_node, "color")

By controlling the light intensity, we ensure that our object’s brightness stays within aesthetically pleasing levels.

Gradient Mapping with Clamped Values

Gradient mapping is a powerful technique to colorize textures based on their luminance. We can use the clamp node to limit the gradient mapping to certain luminance levels.

// Assume you have a gradient texture representing your color map
var gradient_node =
gradient_node.texture = preload("res://gradient_texture.png")

// Get a texture's luminance
var luminance_node =

// Clamp the luminance node output
var luminance_clamp =
luminance_clamp.min_value = Vector3(0.3, 0.3, 0.3) // Limit the gradient mapping
luminance_clamp.max_value = Vector3(0.7, 0.7, 0.7)

// Add and connect nodes
shader.add_node(luminance_node, Vector2(100, 450))
shader.add_node(luminance_clamp, Vector2(300, 450))
shader.add_node(gradient_node, Vector2(500, 450))

shader.node_connect(texture_node, "rgb", luminance_node, "input")
shader.node_connect(luminance_node, "luminance", luminance_clamp, "input")
shader.node_connect(luminance_clamp, "output", gradient_node, "uv")
shader.node_connect(gradient_node, "rgb", output_node, "color")

Now, we’ve added a level of sophistication to how textures are colorized, enabling more nuanced visual effects.

Manipulating Heightmaps for Terrains

Heightmaps are grayscale images that store the height information of a terrain. Let’s see how clamping can help us ensure that our terrain’s elevation stays within certain bounds.

// Load a heightmap
var heightmap_node =
heightmap_node.texture = preload("res://heightmap.png")

// Create a clamp node for the heightmap
var heightmap_clamp =
heightmap_clamp.min_value = Vector3(0.1, 0.1, 0.1) // Minimum elevation
heightmap_clamp.max_value = Vector3(0.9, 0.9, 0.9) // Maximum elevation

// Add nodes to shader
shader.add_node(heightmap_node, Vector2(100, 600))
shader.add_node(heightmap_clamp, Vector2(300, 600))

// Connect everything
shader.node_connect(heightmap_node, "rgb", heightmap_clamp, "input")
// This output would then be factored into the displacement of the terrain mesh

Using clamped heightmap values like this allows for more consistent terrain generation.

Blending Animations with Clamps

When working with vertex shaders, you can blend two animations together, ensuring the blend does not exceed the desired threshold with the help of a clamp.

// Assume we have two animations represented by two float values.
var blend1_node =
blend1_node.constant = 0.5

var blend2_node =
blend2_node.constant = 0.8

// Create an addition node to combine animations
var addition_node =
addition_node.operation = VisualShaderNodeScalarOp.OP_ADD

// Clamp the result
var blend_clamp =
blend_clamp.min_value = Vector3(0.0, 0.0, 0.0) // No negative blend
blend_clamp.max_value = Vector3(1.0, 1.0, 1.0) // Blend maxes at full influence

// Add nodes to shader
shader.add_node(blend1_node, Vector2(100, 750))
shader.add_node(blend2_node, Vector2(100, 800))
shader.add_node(addition_node, Vector2(300, 775))
shader.add_node(blend_clamp, Vector2(500, 775))

// Connect nodes
shader.node_connect(blend1_node, "output", addition_node, "a")
shader.node_connect(blend2_node, "output", addition_node, "b")
shader.node_connect(addition_node, "output", blend_clamp, "input")
// The clamp output would be used for the final blend calculation

By clamping your blend result, you will seamlessly transition between animations without any jarring effects or exceeding constraints.

These scenarios showcase just a few of the many ways VisualShaderNodeClamp can be harnessed in Godot 4 to achieve precise and controlled results. As you integrate these examples into your work, remember that experimentation is key. Each line of code offers a chance to explore new artistic avenues in your game development journey with us at Zenva.

Where to Go Next in Your Game Development Journey

The world of game development is vast and continually evolving, filled with endless possibilities to explore. If you’re looking to expand your skills beyond mastering the VisualShaderNodeClamp and delve deeper into the Godot engine, our Godot Game Development Mini-Degree is an excellent next step. This comprehensive program offers detailed courses on various aspects of game creation with Godot 4, ensuring you get the foundational knowledge necessary to build cross-platform games and the know-how to implement more complex systems.

Whether you’re a complete beginner or you’ve already grasped the basics and are seeking to professionalize your skill set, our curriculum is designed to accommodate your learning pace. With project-based courses accessible 24/7, you can build a solid professional portfolio and prepare for a career in game development. Additionally, consider browsing our broad range of Godot courses to find content that caters exactly to your current level or specific interests.

We, at Zenva, offer over 250 expert-made courses that go beyond game development, including programming and AI, that will help keep your learning momentum going and boost your career. Our mission is to provide high-quality education that transforms students into professionals. Join us, and let’s code, create, and conquer the world of game development together!


The VisualShaderNodeClamp is more than just a tool; it’s a gateway to polished and high-quality game content creation. By learning to integrate such nodes effectively into your visual shaders, you’re not only enhancing your game’s visuals but also building a foundation for more advanced graphical programming techniques. Keep in mind that every great game stands out not just because of its gameplay but also due to its captivating visual appeal, which is often grounded in solid shader work.

Taking the time to master nodes like the VisualShaderNodeClamp is just the beginning. We invite you to continue your path to game development mastery with Zenva’s Godot Game Development Mini-Degree. Here, you’ll find yourself in a community of like-minded individuals driven to create, innovate, and push the boundaries of what’s possible in the gaming world. Turn your passion for games into a fulfilling career and let’s embark on this creative journey together. Happy developing!

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