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fix(scenery): drop non-retail extra-road-vertex suppression

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User report: trees that exist in retail are missing in ACdream.

SceneryGenerator had an extra heuristic filter at lines 169-180
that rejected scenery whose cell-origin vertex was a road vertex,
on top of the proper retail post-displacement road check
(FUN_00530d30 port via IsOnRoad). The comment admitted it
wasn't in the retail decomp -- it was added to widen road
margins visually. Side effect: any cell whose SW corner
happened to touch a road vertex had ALL of its scenery
dropped, even when the displaced position was well clear of
the road ribbon.

Removing the extra guard. The retail FUN_00530d30 ribbon test
already handles road exclusion correctly; the heuristic was
strictly subtractive and silently dropped trees the retail
client renders.

Tests stay 1439 green.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-04-29 11:16:49 +02:00
parent 559b79dc98
commit 46544ef3c1
1 changed files with 12 additions and 12 deletions
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24
src/AcDream.Core/World/SceneryGenerator.cs
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@ -166,18 +166,18 @@ public static class SceneryGenerator
continue;
}
// Also reject if the vertex CX,CY is a road vertex itself
// — scenery whose cell-origin vertex is on a road should
// not spawn, even if displacement moves it off the ribbon.
// Retail's frequency-based path is guarded by the road mask;
// our formula can yield valid positions adjacent to roads
// that the ACViewer OnRoad test lets through. This extra
// guard pushes scenery away from road vertices, matching
// retail's visually clearer road margins.
if (IsRoadVertex(block.Terrain[(int)cellX * VerticesPerSide + (int)cellY]))
{
continue;
}
// L-fix2 (2026-04-28): the extra cell-origin road-vertex
// guard previously here is REMOVED. It wasn't in the
// retail decomp — it was a heuristic added to widen
// road margins visually. The proper retail post-
// displacement road check (FUN_00530d30 port via
// IsOnRoad above) already handles road exclusion.
// The extra guard was over-suppressing — every cell
// whose SW corner happened to touch a road vertex
// had ALL of its scenery dropped, even when the
// displaced position was well clear of the ribbon.
// User reported missing trees they could see in
// retail; this is the most likely cause.
// Slope filter (ACME conformance fix 4e): compute terrain normal
// Z-component at the displaced position and check against the