Maze and Slab now report BIT-IDENTICAL: FPSemantics = Precise, set for
cross-platform play, dissolved the ULP residue. Hypothesis 3 had the right
mechanism all along — under /fp:fast the compiler transforms by surrounding
context with no isolable axis, which is exactly why five one-variable experiments
all came back negative. Removing the permission removed the difference. Nobody
solved C10; C9 got fixed for an unrelated reason and C10 fell out of it.
SurfaceWorld step 1 forced an architectural decision. DECOMPOSITION section 5 notes
the height ops operate on Z values rather than density, then lists them as children
of FHeightfieldSource. Writing them made the consequence unavoidable: they do not
fit IVoxelDensityOp. No input Z (they produce one), XY-pure per column rather than
per voxel, and they write neither channel. Forcing them in would need a per-voxel
channel for a column property, or one opaque op — section 2.5's failure mode.
So height space gets its own contract: VoxelHeightOp.h (FVoxelHeightSample with
Height + Relief, IVoxelHeightOp, FVoxelHeightStack) and five ops. Relief is the
original's M — produced by the structural source, consumed by the terrace gate.
Section 0.1 found density needed a second channel; this found terrain needs a
second space.
The type system now forbids for free what AUDIT 6.3 warns about: a height stack
cannot hold Z-dependent data because there is no Z in the signature.
Deliberately staged — this touches nothing on the density path. If height space had
not decomposed cleanly, it shows up here for one test rather than after building the
adapter, the column cache integration and the dispatch on top.
The test runs twice; the second pass is load-bearing because the F20 terrain ops are
off by default, so a defaults-only run leaves all four modifiers untested. It also
brute-forces MaxDisplacement, since a false bound would later be a hole.
ComputeSurfaceTerrainZ moved private -> public for the test, same justification as
GetSlabDensity. Old declaration removed.
UNVERIFIED: not compiled.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Fr0zka
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