The 5-layer fog model's deep fog sub-zone (alpha 0.55-0.70) was designed
for the old peripheral sector. After #569 removed peripheral, tiles behind
the player dropped straight to deep fog — indistinguishable from unexplored
black over dark scene tiles.
D-015 is explicit: behind = light fog overlay, art preserved, just "not
fresh." There is no deep fog sub-zone.
Changes:
- Remove dual light/deep fog alpha — all explored tiles use alpha 0.25-0.35
- Add 5x5 Gaussian blur on exploration texture to soften staircase boundary
- Use blurred exploration value for the visual transition (raw for anti-bleed)
- Remove DARK_OVERLAY constant (zone_tint handles all explored color)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.6
6d416d144f
