I pressed play again. The explosion looked different. The timing in my cinematic broke instantly.
This post is part of my daily learning journey in game development.
I’m sharing what I learn each day — the basics, the confusion, and the real progress — from the perspective of a beginner.
On Day 71 of my game development journey, I learned how simulation caching works for Chaos destruction and Niagara effects in Unreal Engine.
What I Tried
I created a cinematic shot using Chaos destruction. When I played it in Sequencer, the object shattered nicely.
But when I replayed the sequence, the destruction looked slightly different.
The same problem happened with Niagara fluid simulations. Each playback produced a slightly different result.
This completely broke the timing of the cinematic.
What Confused Me
Why does the simulation change every time I press play?
Why doesn’t Sequencer reproduce the exact same effect?
Is Chaos random?
Is Niagara simulation unstable?
It felt impossible to control the timing.
What Finally Clicked
Chaos and Niagara are real-time simulations. They calculate physics every frame using forces, collisions, and timing.
Even tiny timing differences can produce different outcomes. Caching solves this.
Instead of recalculating the simulation every time, Unreal records the simulation once and stores it as cached data. Sequencer can then play back the recorded result.
Simulation = dynamic and unpredictable
Cache = recorded and repeatable
For cinematics, repeatability matters more than live physics.
Practical Fix
- Run the simulation once in the scene
- Create a cache using Chaos Cache Manager or Niagara Sim Cache
- Add the cached simulation to Sequencer
- Disable live simulation playback
- Use the cache for final cinematic timing
Performance Note
Cached simulations improve playback stability. However, large caches can increase disk usage. Use caching mainly for final cinematic shots, trailers, or complex simulations.
One Lesson for Beginners
- Real-time simulations can produce different results each run
- Cinematics require consistent playback
- Caching records the simulation once
- Use cache instead of live simulation in Sequencer
- Avoid caching during early experimentation
Caching turns dynamic simulations into deterministic playback.
That control is essential when editing, rendering, and timing cinematic sequences.
Slow progress — but I’m building a strong foundation.
If you’re also learning game development, what was the first thing that confused you when you started?
See you in the next post 🎮🚀
Top comments (0)