Doomsday Engine

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These effects are not currently included in network packets
(they are entirely local), as such they don't appear in demos.

One way to solve this would be for clients to track the
health of mobjs so that damage generators can be spawned
locally.

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I have added a note into the beta6 release plan that clients should record local
effects and objects into demo files. Currently clients already record the camera
position as experienced by a client, but it should also include HUD animations,
local sounds, and particle effects, etc.

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bump - whats happening here ?

Converting to RFE as this really isn't a bug,

While it is not feasible to record all the individual particles into a demo, the particle generator definition and an event to start the generator should be part of the demo, so that during playback the generator can be replayed (almost) the same way as during recording.

Can't we seed the RNG used for particle effect randomization? This would mean that provided the same generators are used and triggered at the same time the effects should be identical when played back on any client (deterministically repeatable).

Yeah, a custom, deterministic RNG for each generator should be possible and it sounds like the preferred solution here.