zwitschi cbdb8e6e3a test(site): the source is right, the engine is wrong about where the road is ...

Regenerated the street blend from OSM and the DEM (the code was already correct: 279.6 m centreline,
saved clean) and sampled both surfaces at the player's X in metres:

  Road_Hollywood    y -9.0..-9.1,  z 0.87..0.94
  Sidewalk_North    y +11.9..+12.0, z 1.51..1.59

The road is the south band at about 0.9 m and the north sidewalk is about 1.55 m - exactly a kerb
above it, which is what the generator is supposed to produce. The source is correct.

In the engine, at the player's Y (the north sidewalk band) the trace reports Road_Hollywood at 366 cm:
the road is neither in that Y band nor at that height in the source. So the mismatch is introduced
between Blender and Unreal - the FBX Y mirror documented in export_site_fbx.py, or the importer's
transform - not by the geometry or the placement code.

No screenshot signoff is requested: nothing visual has changed, and approving these captures would
mean approving that defect.

2026-11-09 18:24:48 +01:00

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