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Activate / Deactivate Single Emitter from System in Unreal Engine 5.4 Niagara Tutorial

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Video Title: Activating and Deactivating Emitters in a Multi-Emitter System (Blueprint Tutorial)

Introduction:

• Start with a greeting and mention that today’s tutorial will address a common question: controlling individual emitters (activating and deactivating) in a system with multiple emitters.
• You demonstrate the concept with two emitters (Red and Green). The Red emitter deactivates when you press the Left Mouse button, and it reappears when you release it.

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Tutorial Process:

1. Creating a New Emitter System:
   • Create a new particle system in an empty folder, naming it FX.
   • Add a fountain emitter, rename it “Red”, and set it to red.
   • Duplicate the emitter, rename it “Green”, and set it to green.
2. Using User Parameters for Control:
   • In the spawn rate for both emitters, create a user parameter.
   • Rename parameters: Red (for red particles) and Green (for green particles).
   • Set the red spawn rate to 0 to stop the red particles from spawning, while keeping green particles active.
3. Using Boolean Control for Activating/Deactivating:
   • Create a Boolean user parameter for each emitter.
   • If the Boolean is turned off, the red particles will disappear. If it is turned on, the red particles will appear.
   • This allows for on-the-fly control over the particle system’s behavior.
4. Blueprint Setup for Control:
   • Open the Level Blueprint and select the FX system in the viewport.
   • Add events for the Left Mouse button press and release. On press, deactivate the red emitter, and on release, activate it.
   • Test the functionality in the viewport.
5. Kill on Button Press (Optional):
   • If you want to immediately kill all red particles when the Left Mouse button is pressed, use the “Kill” function with an inverted Boolean.
6. Using Self State to Control Individual Emitters:
   • If you want separate control over the emitters, reset parameters to 100 and 100 for both emitters.
   • Use the “Self” setting for each emitter. Set one emitter to “Complete” and the other to “Kill Immediately”.
   • This allows independent control over when the emitters die or complete their effects.
7. Final Test:
   • Test the final setup where the red emitter deactivates and the green emitter completes its particle spawn.

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Conclusion:

• Summarize the methods covered: using user parameters for spawn rate, using Boolean parameters for activation/deactivation, and using the “Self” state to control emitter behavior individually.
• Encourage viewers to experiment with different methods.
• End the video with a sign-off and invitation to keep learning.