Activation FX in UE4 Niagara Tutorial

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Hi guys, I’m Ashif Ali, and you’re watching CGHOW! In today’s video, we’re going to create a simple effect that spawns when a character taps on a red aim marker on a red platform. This effect will appear when the character is close to the marker and stop when the character moves away. Let’s start creating this from scratch!

[Music plays]

Before we begin, make sure to subscribe to my YouTube channel and hit the bell icon so you never miss a new video.

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I’m working with an empty project in Unreal Engine 4.27, and I’ll start by adding the Third Person Template. This is the map we’ll be using.

[Music plays]

I’ll remove some unnecessary objects for now, like the text and other things in the scene. Let’s quickly bake the light to remove the shadows. Once that’s done, I’ll be ready to proceed.

Now, I have the basic setup. I’ll create a new folder called FX to organize my assets. I’ll right-click and create a Material called M_Ring_01 for the ring effect.

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Creating the Ring Material:

1. Radial Exponent: We’ll use this to create the basic ring shape. To do that, I’ll take a Vector to Radial node and connect it to the UVs input.
2. Density Adjustment: By setting the density to 0.1, we get a softer ring. If I increase it, the ring becomes sharper.
3. Sharpness Control: To control the sharpness, I’ll use a Step node, adjusting the values to get the desired sharp edge. A value of 0.5 gives a sharper ring, while 0.0 produces a more faded edge.
4. Opacity and Color: I’ll use a Lerp node to blend between sharp and faded edges, using the Particle Color for the final output. We can control the opacity using the alpha channel for transparency.

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Setting Up the Particle Effect:

1. I’ll create a new Niagara System for this ring effect. In the emitter, I’ll start with a basic particle that has a constant life of 1 second and a size of 100.
2. Dynamic Parameter: I’ll use a dynamic parameter to control the thickness of the ring. By default, the thickness value is set to 0.6, which looks good for now.
3. I’ll apply the material to the emitter, tweak the color to make it glow (with a value of 5), and adjust the size of the ring for better visibility.

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Custom Alignment and Local Space:

To make the ring face the ground properly, I’ll use a Custom Alignment with a Vector that aligns the sprite to the mesh’s orientation. I’ll also make the emitter run in Local Space so the effect stays fixed in the world.

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Animating the Ring:

Now that the ring is set up, I’ll animate it. I’ll scale the ring from its starting size to a larger one over time. For the sprite size, I’ll use a curve to animate the size, and I’ll also adjust the color alpha to make the effect fade in and out.

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Adding the Aim Marker:

Next, I’ll create a new Niagara system for the red aim marker. This effect will appear when the player taps on the red platform. I’ll tweak the color to a bright red and adjust the fade for a cool, accidental glow effect I stumbled upon.

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Blueprint Setup:

1. I’ll create a Blueprint Class for the placeholder aim marker. In this blueprint, I’ll add a Sphere Collider to detect overlaps.
2. When the player overlaps with the marker, I’ll use the Spawn System at Location node to trigger the particle effect at the marker’s location.
3. I’ll set it to deactivate the effect when the player moves away from the area.

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Final Adjustments and Testing:

• I’ll add more elements like particle slots, shooting particles, and effects to enhance the look of the scene.
• By adjusting parameters like particle size, velocity, and drag, I’ll refine the overall effect and make it look even more dynamic.

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Conclusion:

That’s it for this tutorial! You now have a complete effect that spawns when the player interacts with the marker. Feel free to duplicate the blueprint and tweak the parameters to create unique effects for your project.

I’ll be uploading the project to my Patreon so you can download and use it. Thanks for watching, keep learning, and see you in the next video. Bye-bye!