emitter

set 0× in templates and rigs

Seekable particles, each a closed-form function of its own age, drawn as camera-facing quads: `kind` picks hot streaking sparks, drifting embers, rolling smoke, twinkling stardust or tumbling debris, and any attribute overrides it.

emitter(buoyancy=1 burst=1 color-end=#ffffff)

Attributes

buoyancynumbermm/s² up.0×

burstnumberSeconds over which all of `count` leave, once; `0` emits continuously (sparks 0.06, debris 0.05, the rest 0).0×

color-endcolour #rrggbb0×

color-startcolour #rrggbbThe colour when born; `color-end` at death. On debris: its heat, then the cold rock.0×

corenumber0×

countnumberHow many particles at most, up to 20000.0×

curlnumberHow far the swirling wobble displaces them, mm; `curl-scale` is the size of its eddies, mm.0×

curl-scalenumber0×

direction"x y z"`x y z`, the axis of the cone they leave in (default up). Aim with this, not `rotation`: gravity is the node's -y.0×

dragnumberAir drag, 1/s.0×

durationnumberContinuous: seconds it emits; the last ones then live out (default no end).0×

everynumber0×

fade-innumber0×

fade-outnumber0×

flarenumber0×

flickernumberPer-particle twinkle, 0..1.0×

floornumberThe y of a flat floor to bounce on, in the node's own space: an emitter at y 300 over a floor at 0 says `-300` (default none).0×

frictionnumber0×

glownumberEmissive gain.0×

gravitynumbermm/s² down.0×

kindtext`sparks` (default), `embers`, `smoke`, `stardust` or `debris`: the defaults of everything else, the look included.0×

life-maxnumber0×

life-minnumberShortest life, seconds; `life-max` the longest.0×

looptrue / false`true` repeats it; `every` is its period in seconds.0×

opacitynumberOverall opacity; also × node opacity keys.0×

position"x y z"0×

prewarmnumberContinuous: seconds already elapsed at `start`, so it is already running.0×

radialnumber0×

ratenumberContinuous: particles a second, capped at count / life-max.0×

restitutionnumberBounce on the floor, 0..0.95; negative ignores it.0×

seednumberRolls different dice.0×

shapetextWhere they start: `point` (default), `sphere`, `disc`, `ring` (both on XZ) or `box`.0×

shape-sizenumberRadius in mm, or `w h d` for a box.0×

size-endnumber0×

size-pownumber0×

size-startnumberDiameter when born, mm; `size-end` at death.0×

size-varnumber0×

speednumberHow fast they leave, mm/s; `speed-var` is how much slower the slowest is, 0..1.0×

speed-varnumber0×

spinnumber0×

spreadnumberThe cone's half angle in degrees; 180 is every way.0×

startnumberWhen it starts, seconds.0×

stretchnumberSeconds of motion a streak spans; glow kinds only.0×