From 462b71e896df07bc336bee08d87d9ee0dc37d1e8 Mon Sep 17 00:00:00 2001
From: umsangdon <umsangdon@gmail.com>
Date: Sun, 30 Aug 2026 14:38:24 +0900
Subject: [PATCH] =?UTF-8?q?fix(B04):=20=EB=8F=84=EC=97=BD=20=EC=84=9C?=
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dtm_sheet.npz에 bounds가 없어 등고선 API가 LAS structured.npz bounds로
폴백했고, 메시(glb)는 sheet 격자 중심으로 만들어져 등고선이 X -7.1m,
Y +3.4m, Z +3.3m 떠 보였다. LAS 없는 프로젝트면 등고선 생성 자체가 실패한다.
glb와 같은 bounds(3x2)를 npz에 저장해 두 산출물이 같은 원점을 공유한다.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
---
 .../B04_PreProcess_Engine_SheetSurface.py     | 23 +++++++++++--------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/B04_PreProcess/B04_PreProcess_Engine_SheetSurface.py b/B04_PreProcess/B04_PreProcess_Engine_SheetSurface.py
index e9c13960..a5f57920 100644
--- a/B04_PreProcess/B04_PreProcess_Engine_SheetSurface.py
+++ b/B04_PreProcess/B04_PreProcess_Engine_SheetSurface.py
@@ -144,17 +144,9 @@ def build_sheet_surface_model(
     stem = f"dtm_{SHEET_SOURCE_FILTER}"
     model_path = models_dir / f"{stem}.npz"
     preview_path = models_dir / f"{stem}_preview.glb"
-    atomic_npz(
-        model_path,
-        x=x_coords,
-        y=y_coords,
-        z=z_grid,
-        valid_mask=valid_grid,
-        resolution=np.array([SHEET_SURFACE_GRID_M], np.float32),
-    )
-
-    vertices, faces = _preview_mesh(x_coords, y_coords, z_grid, valid_grid)
     finite_z = z_grid[valid_grid]
+    # bounds를 npz에 같이 넣는다 — 등고선 API가 이 값을 화면 원점으로 쓴다. 없으면
+    # LAS structured.npz로 폴백해 메시(glb) 원점과 어긋난다(LAS 없는 설계는 아예 실패).
     bounds = np.array(
         [
             [x_coords[0], x_coords[-1]],
@@ -162,6 +154,17 @@ def build_sheet_surface_model(
             [float(finite_z.min()), float(finite_z.max())],
         ]
     )
+    atomic_npz(
+        model_path,
+        x=x_coords,
+        y=y_coords,
+        z=z_grid,
+        valid_mask=valid_grid,
+        bounds=bounds,
+        resolution=np.array([SHEET_SURFACE_GRID_M], np.float32),
+    )
+
+    vertices, faces = _preview_mesh(x_coords, y_coords, z_grid, valid_grid)
     write_glb(preview_path, vertices, faces, bounds)
 
     logger.info(