Step 2a green on all four counts, including FSurfaceColumnSource bit-identical to
GetSurfaceDensity over 20000 samples.
FOverhangShelfMod is the case that justifies where the two spaces were split: its
uphill reach grows with altitude (Frac = (Z - TerrainZ) / OverhangHeight), so it is
essentially Z-dependent and could not have lived in VoxelHeightOp.h. The boundary
falls where the code changes nature.
It needs TerrainZ plus a per-column gate (amp, uphill dir) the source computes.
Recomputing per voxel would pay the cliff's four resamples per lip voxel; adding a
third channel to FVoxelOpSample would put a COLUMN property in a per-voxel slot and
pollute a shared contract (section 11 has that open). Instead the source memoises
the column and the overhang reads it — the same shape as cliff -> structural.
The memo is keyed on (InstanceId, X, Y) with InstanceId from a monotonic atomic
counter, not on `this`: a freed stack and a newly allocated one can share an address,
a never-decreasing counter cannot collide. The stack evaluates every Z of a column at
one XY, so the hit rate is ~1 and this recovers per-column reuse without inventing a
second cross-chunk cache.
ComputeSurfaceColumn and SurfaceDensityFromColumn are now public: they are the only
oracle for the overhang, since GetSurfaceDensity passes OverhangAmp = 0. Private
declarations removed.
The test's third pass places half its samples inside the overhang window on purpose —
a uniform Z draw would almost never hit it and the test would pass having never run
the op, the same trap as WaterLevelRelative in the height pass. The in-window count is
reported and warns at zero.
Still missing before wiring: biome blending (the Mask combiner, section 5's Phase 3
prototype). Do not tick bUseOperatorStack on a SurfaceWorld strate with biomes yet.
UNVERIFIED: not compiled.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Fr0zka
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