Pool size: the most particles alive at once. Changing it rebuilds the GPU buffers.
Shape over life (0 → 1), each an evenly spaced list of 1 to 8 keys.
Colour (#rrggbb); multiplied by the blackbody colour when render.blackbody.
Opacity multiplier.
Size multiplier.
Spawn shape and initial state.
Centre, local space, metres.
point, box (half extents size), disc (radius size[0], on XZ), sphere (radius size[0]) or sources (see threejs-particles!ParticleSystem.setSources).
Box half extents / disc and sphere radius in [0]; for sources, the jitter half extents around each source.
Random extra speed in a random direction, m/s.
Initial temperature range, kelvin (drives buoyancy, cooling and blackbody colour).
Initial velocity, m/s.
What moves particles.
Ambient air temperature, kelvin.
Buoyancy: up-acceleration = 9.81 × buoyancy × (T − ambient) / ambient (Boussinesq).
Exponential cooling towards ambient, 1/s.
Drag towards the air velocity, 1/s.
Gravity, m/s² (down).
With a grid: up-acceleration from the grid's channel 0 (heat h), gridLift × h / (1 + h) m/s².
Curl-noise turbulence, m/s².
Eddy size, metres.
How fast the eddies change, 1/s.
Air velocity, m/s; drag pulls particles towards it.
Wind grows by this share per 100 m above emitter.position.y (wind shear).
Life range, seconds.
Most particles spawned in one update (caps catch-up after a long frame).
Particles per second. With emitter.shape: 'sources' this is per unit of source weight, so a
bigger fire front spawns more. Throttled so the pool never runs out (capacity / mean life).
How particles are drawn.
Smoke: light absorbed per unit of density.
Smoke albedo for clean (white) smoke and dirty (dark) smoke; particles mix by their source tint.
Smoke: Henyey-Greenstein anisotropy (0 isotropic … 0.9 strongly forward).
Height / width of each quad.
Colour from temperature (blackbody) instead of only the colour curve.
additive (sparks), alpha (smoke) or premultiplied (flames: emit light and partly hide what is behind).
Smoke: height above the emitter (metres) where the plume caps into bright, dense, sharply billowing pyrocumulus-like cloud. 0 = off.
Per-pixel noise detail 0…1 (0 = flat sprites, cheapest).
Beyond this camera distance (metres) the per-pixel detail and self-shadow taps fade out.
Smoke: warm light from below (#rrggbb), scaled by how hot the particle still is.
Smoke: glow strength.
Brightness multiplier (HDR; > 1 blooms).
Smoke with a grid: per-particle density steps towards the sun through the grid (0…8). Rebuilds the compute pass.
Opacity multiplier.
Haze: screen-space refraction strength (fraction of the screen).
Built-in shading: unlit sprites, noise-shaped flame tongues, lit volumetric smoke, thin spark streaks, refracting haze.
Smoke: per-pixel density taps towards the sun (0…4). Rebuilds the material.
Smoke: extra forward-scattered light on thin edges when back-lit (silver lining).
Base size (width), metres.
Random size multiplier range.
Soft depth fade against opaque geometry, metres (0 = hard).
Back-to-front GPU sort (alpha blending).
Stretch along velocity: extra length = speed × stretch (seconds). 0 = camera-facing quads.
Seed for every per-particle random number (spawn position, velocity, size, life).
Every setting of a ParticleSystem. Plain JSON.