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