Particles

Base render size as a percentage (10 to 500%, default 100%).

Makes fast particles bigger and slow ones smaller (-100 to 100%, default 0). Negative values invert: slow particles bigger.

Per-particle random size variation at spawn (0 to 100%, default 0). At 100%, particle size at birth varies between 0% and 200% of base.

Optional AE layer whose brightness multiplies particle size at that pixel position. Black areas = invisible particles; white = full size.

When on (default), particles live forever. When off, particles are born, age, and die, unlocking the lifetime controls below.

Seconds each particle lives before disappearing (0 to 30, default 5). Only used when Full Lifetime is off.

Per-particle random variation on Lifetime (0 to 100%, default 0). At 100%, actual lifetime varies between 0% and 200% of the base value.

Scale multipliers at birth and death (0 to 500%, default 100% each). E.g., 0% birth + 100% death = particles fade in size-wise.

What portion of each particle's life passes before it starts shrinking to Death Size (0 to 99%, default 0). 50% = hold Birth Size for the first half, then shrink.

Seconds at the start / end of a particle's life over which its alpha ramps 0 to 1 / 1 to 0 (0 to 5 sec each, default 0).

Disc (default round dot), Square (pixel-y look), Trail (short motion-history tail — see Trail Length / Width below for tuning), Metaball (particles blend smoothly into surfaces, great for water / slime).

Seconds of history drawn behind each particle (0 to 2, default 0.3) and line width in pixels (1 to 10, default 2). Only in Trail mode.

Threshold controls the isolevel (0 to 2, default 0.6). Radius is the blob radius per particle (50 to 500%, default 200%). Lower Threshold = thicker fluid; higher Radius = smoother surfaces.