Blood Cells Flow | Unreal Engine Niagara Tutorials | UE4 Niagara Blood Cells Flow

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Hi guys today i have created this blood cells flow effect in unreal engine Niagara. so for this effect i have a tube/nerve which have a blood material on it then i have a camera that moving into that tube and i animated camera manually in sequencer . after that i have a spline in view port and my cell particles moving along that spline. for that spline effect i have created a custom module script for Niagara. i will show your that spline process from scratch in this video .

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Blood Cell Simulation Effect in Unreal Engine Niagara | CGHOW

Hello everyone! I’m Ashif Ali, and you’re watching CGHOW. Today, I’ll show you how I created this blood cell simulation effect in Unreal Engine using Niagara.
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This blood cell simulation is unique and distinct from my other effects, as it combines several key components to create a dynamic and realistic flow. Let’s dive into each step and explore how you can create this effect from scratch.

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Overview of Components

1. Main Mesh and Material Setup
   • I started with a tube mesh as the main component.
   • The tube mesh has a custom material that uses red and yellow color gradients with noise and panning effects to simulate the blood cell texture.
2. Spline Path for Particle Motion
   • The particles follow a spline path along the tube to simulate fluid movement.
   • Spline FX Module: Created a custom spline FX module to guide particles along this path. I also animated the camera to follow the particles through the tube.
3. Material Details
   • Color & Noise: Added noise to the red color to give it a swirly effect and panned it for dynamic motion.
   • Edge Detail with Fresnel: Applied Fresnel shading to add an orange glow on the edges for a 3D look.
   • Distortion: Used vertex offset to create realistic mesh distortion for the blood cells.
4. Water-like Flow Simulation
   • Created a planer mesh inside the tube with a material that gives the appearance of flowing blood.
   • Adjusted opacity to blend edges seamlessly, using depth fade for smooth transitions along the tube walls.

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Detailed Walkthrough

Step 1: Set Up the Spline

• Created a spline and added it to the scene to define the path for the particle flow.
• Used a module script to snap particles to the spline path while allowing slight movement with noise for realism.

Step 2: Material Setup for Blood Cells

• Base Color: Used a combination of red and yellow with noise for texture.
• Normal Map: Added a normal map to enhance surface details.
• Emissive & Distortion: Included emissive details and vertex offset for distortion.

Step 3: Adding Particles

• White and Red Blood Cells: Created individual emitters for red and white cells, each with unique color and size variations.
• Trail Effect: Added a ribbon trail effect to simulate blood plasma, following the movement of white blood cells.
• Adjusted parameters for initial rotation, velocity, drag, and gravity.

Step 4: Final Touches with Camera Animation

• Animated the camera along the tube to capture the blood cells’ movement.
• Manually animated the camera for smoother motion instead of simply attaching it to the spline.

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Material and Particle Settings

• Material for Blood Flow: Used a panning noise texture with an opacity mask to simulate the liquid.
• Dynamic Color Variations: Added a dynamic parameter in Niagara to randomly adjust color shades, making cells appear natural.
• Spline FX Settings: Adjusted particle speed and gravity to follow the spline accurately with noise for randomness.

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Common Issues and Solutions

If you encounter any display issues, such as objects appearing unexpectedly, ensure that:

• All material and particle properties are set correctly.
• The spline path aligns with the particle system.

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Additional Tips

• Module Script for Custom Spline FX: This technique can be reused for any effect requiring particles to follow a complex path.
• Camera Animation: Animating the camera manually allows greater control over the scene’s focus points.

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Thanks for watching! Keep learning and experimenting, and let me know if you have any questions or feedback.
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