Niagara Tutorial: Blend Attributes By Value | UE Content Examples Reconstruction

Version: 4.26, 中文
Created: 2021-02-09, Updated: 2021-03-25
Author: Cyanhall
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1. Preparation

This is the effect we are going to make in this tutorial.

Note: The main content of this tutorial comes from the Content Examples that come with Unreal Engine

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Full Tutorials:

1. UE Niagara: Simple Sprite Emitter
2. UE Niagara: Simple Mesh Emitter
3. UE Niagara: Simple GPU Emitter
4. UE Niagara: Sprite Facing
5. UE Niagara: Blend Attributes By Value
6. UE Niagara: Static Beams
7. UE Niagara: Dynamic Beams
8. UE Niagara: Multiple Renderers
9. UE Niagara: Location Events
10. UE Niagara: Expressions

3. Introduction

Transient variables are local only to a given stack context (Particle Update, for example) and are recalculated from scratch every frame, they do not persisit their value from frame to frame.

This makes them different from Particle.variables which are saved in the particle payload and persist from frame to frame, which comes at a memory and performance cost.

4. Goal

Here we make a transient variable representing the current distance from the emitter origin, and use that to drive a color and scale curve.

5. Let's start the reconstruction

Right click and select FX => Niagara System to create.

6. Create Niagara System

Select Empty template, click + and Finish

7. Create Niagara System

As a result, we get a Niagara System asset, click to open it.

8. Empty Niagara System

You can see that we have an empty Niagara system.

9. Spawn Rate

Click on the + sign to the right of the Emitter Update to add the Spawn Rate module.

Spawn Rate: Number of particles per second to spawn.

10. Spawn Rate

Set the Spawn Rate value to 8.0.

Spawn 8.0 particle per second.

11. Spawn Burst Instantaneous

Click on the + sign to the right of the Emitter Update to add the Spawn Burst Instantaneous module

12. Spawn Burst Instantaneous

Set the value type of Spawn Count to Random Range Int

13. Spawn Burst Instantaneous

1. Set the Minimum value to 3
2. set the Maximum value to 10
3. set the Elevation Type to Every Frame

14. Initialize Particles

Select Initialize Particles and set:

1. Lifetime to 8.0
2. Color Mode to Direct Set
3. Sprite Size Mode to Uniform and its value to 5.0

15. Add Velocity from Point

Add Add Velocity from Point module to the Particle Spawn section.

16. Add Velocity from Point

Click the first Fix issue button to add its dependency on the SolveForcesAndVelocity module.

17. Add Velocity from Point

Set the value type of Velocity Strength to Random Range Float

18. Add Velocity from Point

Set the minimum value to 10.0 and the maximum value to 85.0.

19. Point Attraction Force

Add Point Attraction Force module to the Particle Update section.

20. Add Velocity from Point

1. Click the first Fix issue button to fix the SolveForcesAndVelocity module's dependency order issue.
2. Set the value of Attraction Strength to 1.8.
3. Set Attraction Radius to 256.0.