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Cascade Particle System FixedTime Update Method?

Hi everyone,

Is FixedTime update method in cascade particle system works?

When i use this method and modify UpdateTime_FPS to see what take effect but nothing has changed, another developer also mentiond this(https://forums.unrealengine.com/development-discussion/rendering/1386365-particle-system-fixed-time-question)

And i search in the source(https://github.com/EpicGames/UnrealEngine/blob/release/Engine/Source/Runtime/Engine/Private/Particles/ParticleComponents.cpp) use keyowrds: SystemUpdateMode, EPSUM_FixedTime didn’t found functional reference of it.

Even though i’m not prepare to use this method in particles, i’m really curious about it.

Any help would be greatly appreciated!