CGHOW | Ashif Ali

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hi guys i have created this under water scene in unreal engine 4.25 i used Niagara new tool Particle Attribute reader data interface for fish flocks and other Niagara system is bubbles i have also animated fish in material that i will show you in this video.

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Video Transcript Summary: “Underwater Scene in Unreal Engine Niagara using Particle Attribute Trigger”

1. Introduction
   • Asif Ali introduces the underwater scene created in Unreal Engine using Niagara, specifically highlighting the new Particle Attribute Trigger tool in Unreal Engine 4.25.
2. Scene Setup
   • The scene consists of two particle systems: bubbles and fish. The fish particle system utilizes the Particle Attribute Trigger, while the bubbles use basic particles.
3. Creating the Fish Attractor System
   • The fish particles are designed to follow red attractor particles. Asif demonstrates how to create a new emitter and adjust spawn rates and colors.
   • The green particles (representing fish) are set to follow the red particles by using the Particle Attribute Trigger tool.
4. Using Particle Attribute Trigger Tool
   • A custom module is created using the Particle Attribute Trigger tool to allow the fish particles to follow the red particle positions.
   • A random ID is used to make the fish follow different red particles instead of a single one.
5. Attractor Settings
   • The attractor’s strength and radius are adjusted to make the fish follow the red particles more effectively.
   • Asif demonstrates how to apply curl noise and drag for more realistic movement.
6. Fish Movement and Animation
   • The fish movement is further controlled using random settings such as velocity orientation, drag, and collision with other objects (e.g., rocks).
   • Fish animation is controlled via a custom material that includes a dynamic parameter for random distortion of the fish’s movement.
7. Bubbles Setup
   • Bubbles are set to rise with random movement using a material that distorts the bubble appearance.
   • Asif explains the bubble particle setup, including random scaling, rotation, and the use of trails to follow the bubbles.
8. Additional Settings and Effects
   • The scale of the scene is increased to make the particles move on a larger scale. Simple grass wind effects are applied to materials to simulate natural movement.
   • Visibility of the attractor system is adjusted for better visual clarity.
9. Outro
   • Asif encourages viewers to comment their thoughts and ideas for future tutorials using the new Particle Attribute Trigger tool.
   • He also invites comments about any queries related to the video.

Key Takeaways

• The Particle Attribute Trigger tool allows for advanced control over particle behaviors, such as making one particle system follow another.
• Randomization of particle behavior (ID, movement, size, and speed) enhances the realism of particle interactions.
• The fish animation uses a dynamic material with random distortion to simulate fluid-like motion.
• Bubble particles are set to rise with random movement, and trails are used for visual effect.

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• #UnrealEngine
• #NiagaraVFX
• #ParticleAttributeTrigger
• #UnderwaterScene