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UE5 Niagara #ScratchPad Module #1 | velocity Condition
Hi, this is the first video of this scratch pad module tutorial series. in this tutorial, we will learn how to use velocity conditions to change other parameters of particle behavior or look.

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Video Title:

Master Scratch Pad Basics in Unreal Engine Niagara – Velocity Condition for Particle Effects

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Description:

In this tutorial, Ashif Ali introduces the basics of Scratch Pad in Unreal Engine’s Niagara system. Learn how to use conditions in Scratch Pad to create dynamic particle behaviors, such as changing color or size based on velocity. This tutorial sets the foundation for a series exploring Scratch Pad’s potential for advanced particle effects.

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Key Points Covered:

• Introduction to Scratch Pad: Understanding its purpose and how it enhances particle behavior.
• Setting Up a Condition: Use velocity to create behaviors (e.g., color changes when velocity is positive or negative).
• Practical Example: Modify particles in Niagara Fountain based on their movement direction.
• Efficient Workflow: Leveraging output attributes for reusable and cleaner Scratch Pad modules.

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Step-by-Step Guide:

1. Create a Scratch Pad Module:
   • Add a Scratch Pad Module under Particle Update.
   • Name it (e.g., “Velocity Condition”) and position it above modules that use its output.
2. Define the Condition:
   • Use Get Velocity to access particle velocity.
   • Break the vector to isolate the Z-axis (vertical movement).
   • Add a condition: If Z < 0, it indicates falling; otherwise, rising.
3. Apply Boolean Logic:
   • Right-click to set data types (e.g., float, boolean).
   • Use the If Module to define behaviors based on conditions.
4. Modify Particle Properties:
   • Adjust Color: Use True for green and False for red.
   • Adjust Size: Larger size for rising particles, smaller for falling.
5. Create Reusable Outputs:
   • Define outputs for conditions (e.g., 1 for true, 0 for false).
   • Use these outputs in multiple particle attributes like size, position, or material.
6. Test and Refine:
   • Apply changes and observe the behavior of particles in real-time.
   • Ensure modules are properly linked for expected results.

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Benefits of Using Outputs:

• Simplifies complex behaviors by centralizing logic.
• Enables reuse across multiple attributes like size, color, or material.
• Improves readability and maintainability of Scratch Pad modules.

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Conclusion:

You now know how to use Scratch Pad in Unreal Engine Niagara to modify particle properties dynamically. This is just the beginning—stay tuned for more tutorials in this Scratch Pad series! If you enjoyed this, don’t forget to like, share, and subscribe to CGHOW for more Niagara tips and tricks.

Thank you for watching! See you in the next video. Bye-bye, take care!