Magical gene / fields and regions
Accretion Field
Half of Accretion, and the half that decides its shape: whether the pale field takes the topline or the underside. On its own it paints nothing at all, and every horse alive carries it.
What it can come out as
| Outcome | Carrying |
|---|---|
| Wild type | Atp/Atp · Atp/Abt · Abt/Abt |
How each one is actually drawn - region by region, and the layers it is built from - is on the coding tab.
Crossing two of them
Finding one
No wild horse carries it. Every copy in the world came from a gene carrot or a splice; there is nothing to go looking for.
| Wild pair | Shows as | How often |
|---|---|---|
Atp/Atp | Wild type | 0.12% — 1 in 833 |
Abt/Abt | Wild type | 99.88% |
Its gene carrot
The file
common/src/main/resources/horsegenetics/genes/accretion_field.json — a
data-driven gene, not a Java class. It is listed in the
index.json beside it and registered by Genes' class
initialiser at startup.
| Key | horsegenetics.accretion_field |
|---|---|
| Phase | magical — it adds signed colour in phase 3, after the pigment has resolved |
| Priority | 274 — where it sits in the one (priority, key) paint order |
| Alleles | Atp · Abt |
| Varies per horse | no — every horse carrying it looks the same |
| Built from |
What it paints
Each outcome, described the way the gene file describes it, and then the layers that draw it in the order they are painted. The prose is the part a reader checks a bake against; the list underneath is what the engine actually did.
Wild type
Nothing, on its own - and that is the whole of what this locus does by itself. It exists to be read by Accretion, which asks it which way round to draw: one copy of Atp puts the pale field on the topline, and a horse with none of it takes the underside. A horse carrying no Accretion at all still carries this, still breeds it, and still passes it on - which is why a pair of underside-marked parents can throw a topline foal without either of them ever having shown one.
Paints nothing.