Brush Nodes

The signal blocks a brush graph is built from: inputs, math, shapes, and the terminals that put pigment down.

Name	Category	Description
Paint Color	color	The color currently selected in the toolbar.
Brush Settings	input	Overall brush settings that apply to the whole stroke: size, stabilization, and dab spacing.
Pen Input	input	Live data from the stylus: pressure, tilt, velocity, and position along the stroke.
Random	input	A new random value for every brush mark, useful for jittering size, color, angle, etc.
User Input	input	A dial the painter turns from the brush bar. Wire it into as many inputs as you like and they all follow it.
Add	math	Adds two values; use it to offset one signal by another, e.g. lift pressure by a constant floor.
Divide	math	Divides one value by another: use it to normalize one signal against another, e.g. scale pressure down where a texture is bright. Dividing by zero yields zero.
Multiply	math	Multiplies two values: use it to scale one signal by another, e.g. fade pressure by texture.
Split Color	math	Breaks a color into its red, green, blue, and opacity channels for separate processing.
Subtract	math	Subtracts one value from another: use it to attenuate one signal by another, e.g. reduce pressure where a texture is bright.
Switch	math	Toggle that picks one of two inputs. Wire one side only and it acts as an on/off switch for that branch.
Curve	modulate	Reshapes a value through an editable response curve (e.g. make pressure ramp up sharply or ease in).
Invert	modulate	Flips a value end for end: 0 becomes 1 and 1 becomes 0. Put it on the wires from one dial that should read backwards for some sinks but not others.
Levels	modulate	Adjusts a value’s low end, high end, and midpoint, much like the image-editing Levels filter.
Blur	output	Output that softens existing canvas pixels under the stroke by averaging a neighborhood, compounding where the brush dwells.
Liquify	output	Output that pushes existing canvas pixels around in the direction of the stroke, like a warp brush.
Paint	output	Output that deposits a brush mark onto the canvas. Plug a Stamp Tip (or any colored mark) into the dab input: this is where paint actually lands.
Smudge	output	Output that drags existing canvas pixels along the stroke, like smearing wet paint with a finger.
Watercolor	output	Output for wet-on-wet watercolor: pigment bleeds, pools, and darkens at the edges.
Circle	shape	Procedural brush-tip silhouette: disc, bumpy circle, or superformula.
Polygon	shape	Procedural brush-tip silhouette: a rounded regular polygon (SDF-based).
Stamp Tip	shape	Combines a tip shape with a color to form a colored brush mark. Feed this into a Paint output to deposit it on the canvas.
Clone Source	texture	Samples pixels from a set source point onto the canvas under your cursor. Set the source with the clone set-source gesture, then paint. Feed into a Stamp Tip’s color input.
Image	texture	Uses a picture from the brush bundle as the brush tip shape.
Noise	texture	Procedural noise sampled where the brush touches the canvas, for grain, jitter, and texture.

All 25 brush nodes in Darkly v0.9.0-0-g5cc6474f.