Component icon reference¶

The 2D editor canvas draws what a pipe contains. This page is the key.

It is generated — python scripts/generate_icon_reference.py --write — so the discriminator column cannot drift from the code that classifies.

How to read a block¶

The pattern tells you the family: mesh for wall-flow filters, honeycomb for monoliths, waves for reduction chemistry, dots for porous media.
The tint tells you which member of that family it is.
A pipe carrying none of these stays plain.

There is no text on the canvas. Naming is carried by the hover tooltip and by this table — a deliberate choice, because the block is small and already shows a component id and a kind glyph.

Non-pipe components carry no icon in this release. Junctions, boundary conditions and turbines keep the appearance they have always had. Those kinds carry no tint, so geometry alone would have to separate them at small sizes, and no form of that was found that stayed legible; adding a tint channel for them is the shape a future attempt should take.

Drawn above is the zoom, in device pixels per world unit, below which that pattern collapses to a solid tint so a whole network stays readable. It is the answer to "why did the hatching disappear".

Min ΔE vs backgrounds is a diagnostic, not a gate: the smallest CIE ΔE*ab between the tint and any of the six static canvas backgrounds.

Schematic (`schematic`)¶

Role	Family	Meaning	Discriminator	Tint	Ink	Drawn above	Min ΔE vs backgrounds
`dpf`	filter	DPF — diesel particulate filter	`filter.kind != none`	`#C3C8CD`	dark	100	10.4
`csf`	filter	CSF — catalysed soot filter	`filter.csf is not None`	`#C9A24B`	dark	100	57.1
`scrf`	filter	SCRF — SCR-coated wall-flow filter	`filter.kind == diesel_particulate_filter and SCR reaction`	`#4FA9A0`	dark	100	39.4
`catalyst`	monolith	CAT — catalyst substrate	`catalyst.kind != none or species.reaction == mechanism`	`#66BF73`	dark	74	58.3
`doc`	monolith	DOC — diesel oxidation catalyst	`species.reaction in DOC reactions`	`#E08A4B`	dark	74	62.4
`twc`	monolith	TWC — three-way catalyst	`species.reaction in {twc, twc_brinkmeier}`	`#D46A8B`	dark	74	55.0
`scr`	ammonia	SCR — NH3 selective catalytic reduction	`species.reaction in SCR_REACTIONS`	`#2E6FD1`	dark	89	56.5
`asc`	ammonia	ASC — NH3 slip catalyst	`species.reaction == nh3_slip_catalyst`	`#B48CD9`	dark	89	44.9
`hydrolysis`	ammonia	HYDR — HNCO hydrolysis	`species.reaction == hnco_hydrolysis`	`#C8C86A`	dark	89	51.6
`porous`	porous	POR — porous medium	`porous.kind != none`	`#B9A48C`	dark	114	29.7