Nodes · Keying

BS_EdgeBreakup

Keyingv1coreForge

Overview

The "CG is too perfect" fixer: procedural texture breakup on surfaces and along mattes. Unlike a plain noise×matte (which fades the noise out exactly at the edge), the invert→merge-from→clamp structure keeps edge detail defined. Wire a position pass and switch to world space and the breakup sticks to the surface as the object moves — tracking for free.

How to

How-to

Wire the plate, a matte of the surface, and a P pass if you want the noise nailed to the surface (space = world).
Set amount and noise_size; keep defined_edge at 1 so the edge stays sharp while the core breaks up.
output = matte gives the broken matte alone; key evolution for a boil.

Inputs

Input	What it takes
in	the image this node works on
matte	the alpha that drives this node
P	—

Outputs

Output	Type
out	Image

Parameters

Parameter	Type	Default	What it does
output	Choice	applied	`applied` breaks up the picture's edge; `matte` outputs the broken-up matte alone, to drive something else. `appliedmatte`
space	Choice	screen	Where the noise lives: `screen` in pixels (slides across a moving object), `world` at each pixel's position from the wired P pass, so the breakup is nailed to the surface and travels with it. `screenworld`
amount	Float	0.35	Strength of the effect. 1 = as designed; 0 = none.
defined_edge	Float	1.0	Dial between the naive soft-mask multiply (0 — the noise fades exactly where the eye looks) and the full invert→merge-from→clamp structure (1 — the edge stays defined, the core keeps its detail).
noise_size	Float	32.0	The noise's feature size in pixels (or world units under `space = world`).
noise_detail	Float	4.0	Octaves of noise: 1 is smooth, 6 adds fine grit to every bite.
evolution	Float	0.0	Animate the noise pattern — key it for an edge that seethes.
seed	Float	0.0	The random pattern's starting point. Change it for a different pattern of the same character; keep it to reproduce a frame exactly.
disabled	Bool	false	Bypass: the node passes its first input through untouched (D in the graph). The knobs keep their values for when it comes back.
label	Text		A note shown under the node in the graph — what this node is FOR. Never affects the render or the cache.
hide_input	Bool	false	Draw the node without its input wire — a tidy graph for a node whose source is obvious (a Dot, a viewer tap).