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OpenTS Manual

Slowdown

How much a smoke system's spawn interval lengthens every frame.

Specification
Applies to
ParticleSystemType
File
rules.ini
Section
[<ObjectType ID>]
Value
floating point
When omitted
0.0

The amount is added to the system’s working interval on every frame it runs, not on every particle it emits, so the plume pours fastest when it appears and thins steadily from there. Only the Smoke behavior reads it.

rules.ini
[MySmokeSys] ; a ParticleSystemType registered in [ParticleSystems]
BehavesLike=Smoke
HoldsWhat=MySmokePuff ; a ParticleType registered in [Particles]
SpawnFrames=10
Slowdown=.0025
SpawnTranslucencyCutoff=13.0
SpawnCutoff=15.0

The rate sets the plume’s whole life span, because it is what carries the interval up to SpawnCutoff. The system above stretches from 10 to 15 at .0025 a frame, which is 2000 frames — a little over two minutes — and crosses SpawnTranslucencyCutoff after 1200 of them. Left at zero the interval never moves, so the plume either runs until something else removes it or, where the cutoff is lower than SpawnFrames, is retired on its first frame.

See also — BehavesLike, SpawnFrames, SpawnCutoff, SpawnTranslucencyCutoff