Biome blending needs to ask which biome is at an XY, and the real answer is a warped
Voronoi with a per-chunk cache on UVoxelGenerator. The op must not hold a generator
pointer — Phase 3 wants ops to become assets, and one that owns a generator never
can. So it depends on IVoxelBiomeField, a two-line interface returning (dominant,
neighbour, weight), and the adapter that knows the generator stays on the generator's
side. Same move as cliff -> structural: depend on the capability, not the owner.
FBiomeBlendHeightSource holds one complete height stack per biome and lerps the
HEIGHTS in the border band. Each biome's stack computes its own relief and gates its
own terrace, exactly as the original makes two independent full calls and blends only
the outputs. Blending heights rather than params is what keeps borders continuous
across any param difference.
The ceiling SELECTS the dominant instead of blending, because that is what the
original does. Reproduced as-is rather than improved — a blended sky cap changes the
world's silhouette and a port is not where that gets decided.
Tested against a synthetic field rather than the real resolver: the resolver has its
own coverage, while a synthetic field sweeps the weight 0 -> 1 continuously, which is
where an inverted lerp hides. Five weights x 400 points, bit-exact against FMath::Lerp
of the two full stacks, plus a check that the ceiling still returns the dominant's at
weight 1.
UNVERIFIED: not compiled.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Fr0zka
6ad9f37a65