System: attractor

Structural

Parameter	Default	Range	What it does
tuple	0		Picks a whole known-good figure - family, coefficients and framing together.
palette_steps	0	0 – 16	Quantizes the palette into this many flat bands; 0 leaves it continuous.

Modal

Parameter	Default	Range	What it does
a	0		First of the four family coefficients; what it means depends on the attractor family the tuple picked.
b	0		Second family coefficient - see the roster’s attractor essay for what each family does with it.
c	0		Third family coefficient, and on the IFS figures it means nothing at all.
d	0		Fourth family coefficient; like the other three it is inert on the IFS figures.
size	1	0 – 4	Size of each particle’s deposit into the accumulation.
hue	0	0 – 1	Where this scene reads from the palette, as a coordinate along it rather than a colour.
brightness	1	0 – 2	The scene’s overall light level, multiplying what it draws before the composite.
fade	0.94	0 – 1	How much of the accumulation survives each second; near 1 the figure builds up for a long time.
hue_spread	0.15	0 – 1	How far across the palette the particle band reaches.
hue_center	0.075	0 – 1	Where that band sits along the palette.
saturation	1	0 – 1	Pulls the scene’s colour toward grey; 0 is fully desaturated, 1 is the palette’s own.
palette_mix	0	0 – 1	Crossfades from the preset’s palette to its second one; 0 is the first, 1 the second.
palette_contour	0	0 – 1	Draws a line at each band edge when the palette is stepped; 0 draws none.
zoom	1	0.25 – 4	Scales the whole scene about its centre; above 1 fills more of the frame.
pan_x	0		Slides the whole scene sideways, in the scene’s own units rather than pixels.
pan_y	0		Slides the whole scene vertically, in the scene’s own units rather than pixels.
reseed	0	0 – 1	Crossing zero throws every particle back onto a fresh start position.
perspective	0	0 – 1	How strongly depth shrinks a particle, turning a flat figure into a solid one.
depth_fade	0	0 – 1	How much depth dims a particle, which is what reads as air between the layers.
depth_hue	0	-1 – 1	Shifts colour with depth, so far parts of the figure sit elsewhere on the palette.
spin	0	-2 – 2	Turns per second the figure rotates by about its vertical axis.
morph	0	0 – 1	Travels between the tuple’s figure and the next one; the visible rate is steepest near zero.
curl	0	-2 – 2	Adds a rotational term to the map, curling the trajectories.
vigor	1	0 – 4	How far a particle moves per step, so higher spreads the figure and thins it.
lean	0	-1 – 1	Tilts the map, breaking the figure’s symmetry.
bias	0	-1 – 1	Offsets the map, sliding the figure within its own attractor.
map_tint	0	0 – 1	How much a particle’s colour follows which branch of the map produced it.
map_hue	0	-1 – 1	How far apart on the palette those branches are placed.
root_tint	0	0 – 1	How much a particle’s colour follows the seed it started from.
root_hue	0	-1 – 1	How far apart on the palette those seeds are placed.
emergence	8	0 – 60	How many seconds the figure takes to settle out of its starting cloud.
fb_zoom	1	0.9 – 1.1	Scale the attractor’s own accumulation is grown by each second.
fb_rotate	0	-1 – 1	Turns per second that accumulation is rotated by.
fb_dx	0	-1 – 1	Sideways drift of that accumulation, in frame widths per second.
fb_dy	0	-1 – 1	Vertical drift of that accumulation, in frame heights per second.
fb_center_x	0.5	0 – 1	The horizontal point its zoom and rotation pivot about, in uv.
fb_center_y	0.5	0 – 1	The vertical point its zoom and rotation pivot about, in uv.
fb_warp	0	0 – 0.5	Amplitude of a swirl added to its feedback sample, so the trail curls.