Interactive Grass in UE5 Niagara Tutorial | Download Project Files

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Interactive Grass in UE5 Niagara Tutorial | Download Project Files
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Title: Interactive Grass with Character in Unreal Engine 5 Niagara

[Introduction] Hi guys, I’m Asif Ali and you’re watching CGHOW. In today’s video, I’ll show you how I created interactive grass with a character in Unreal Engine 5 using Niagara. Let’s dive into the process!

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[Tutorial Start]

1. Project Setup
   • I started with a fresh project in Unreal Engine 5 and imported a grass asset with texture.
   • I edited the material to make it two-sided (because by default, it wasn’t).
   • I scaled the grass to a proper size (around 50) so it’s clearly visible.
2. Organizing the Assets
   • Created a folder for the grass and moved the assets into it.
   • Set up a Niagara emitter and chose the “Fountain” template to customize it for the grass.
3. Niagara Setup
   • Spawned 500 particles with a constant life of 5 seconds and added the mesh renderer.
   • Applied the grass mesh to the renderer and adjusted the spawning area using a cylinder location.
   • Set the spawn area dimensions to get a decent spread.
4. Testing the Scale with a Character
   • I placed a third-person character in the scene to check the grass scale relative to the character.
   • Adjusted the size using random uniform values for proper scaling.
5. Randomizing Rotation
   • Applied random rotation to the grass using the mesh’s initial rotation settings to make it look natural.
6. Expanding the Grass Area
   • Changed the spawning area to a larger box to spread the grass over a larger area.
   • Increased the spawn rate to 20,000 particles for more density.

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[Interactive Grass Setup]

1. Grass Interaction with Character
   • To make the grass react when the character moves, I used a “Scratch Module” to create an area of effect.
   • Created a range-based system to trigger color and size changes for the grass when the character enters the range.
2. Blueprint Setup
   • Set up the level blueprint to track the character’s position and pass that data to the Niagara system.
   • The grass particles change color and scale based on the character’s movement.
3. Debugging Offsets
   • I noticed some offset issues, so I added a reference point (an arrow component) to resolve the positioning problem.
4. Fine-Tuning the Grass Behavior
   • I inverted the direction for the grass to “move away” from the character.
   • Adjusted the particle size and used color blending (green to yellow) based on proximity.

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[Final Results]

• Now, when the character moves, the grass interacts by changing color and scale.
• The grass looks more dynamic and reactive, enhancing the visual realism.

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[Conclusion] That’s it for today’s tutorial on creating interactive grass in Unreal Engine 5 with Niagara. I hope you found this helpful!

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Thanks for watching, and see you in the next video!