Orx smoke trail example

smoke.ini

; Add SmokeTrail as a child object, adjusting the position of the spawner as needed, to get a smoke trail
; or exhaust effect.

[SmokeTrail]
Spawner  = SmokeSpawner

[SmokeSpawner]
Object           = SmokeParticle
Position         = (-17, 0, -1)
UseRelativeSpeed = true
ObjectSpeed      = (1, 7, 0) ~ (-7, -7, 0)
WaveDelay        = .025
WaveSize         = 3 ~ 7

[SmokeGraphic]
Texture = pixel
Pivot   = center

[SmokeParticle]
Graphic         = SmokeGraphic
Position        = (0, -1, 0) ~ (0, 1, 0)
Scale           = 2 ~ 7
Alpha           = .7
; Brown smoke
;HSV             = (0.07, 1, .59) ~ (0.13, 1, 0.59)
; Gray smoke
HSV             = (0, 0, 0.4) ~ (0, 0, 0.6)
AngularVelocity = -90 ~ 90
LifeTime        = 2 ~ 4
FXList          = SmokeFX

[SmokeFX]
SlotList = SmokeFade

[SmokeFade]
Type       = alpha
StartValue = 0
EndValue   = -1
StartTime  = 0
EndTime    = @SmokeParticle.LifeTime
Curve      = linear