修正 mini_npz 深度数据职责

src/snapform/image_depth.py

@@ -9,7 +9,6 @@ DEPTH_KEY_CANDIDATES = ("depth", "depths")
 INTRINSICS_KEY_CANDIDATES = ("intrinsics", "ixts")
 DISPLACEMENT_STRENGTH = 1.0
 DISPLACEMENT_MIDLEVEL = 0.0
-REFERENCE_DEPTH_KEY = "snapform_reference_depth"
 ORIGINAL_DISPLACEMENT_STRENGTH = 1.0
 ORIGINAL_DISPLACEMENT_MIDLEVEL = 0.0
 BUMP_BASE_DISTANCE = 0.001
@@ -695,25 +694,6 @@ def extract_intrinsics_array(npz_path):
     return intrinsics
 
 
-def extract_reference_depth(npz_path):
-    try:
-        import numpy as np
-    except ImportError as error:
-        raise RuntimeError("Blender Python does not provide NumPy") from error
-
-    try:
-        with np.load(npz_path, allow_pickle=False) as archive:
-            if REFERENCE_DEPTH_KEY not in archive.files:
-                return None
-            reference_depth = float(archive[REFERENCE_DEPTH_KEY])
-    except OSError as error:
-        raise ValueError(f"Unable to read Mini NPZ: {npz_path}") from error
-
-    if not np.isfinite(reference_depth) or reference_depth <= 0.0:
-        raise ValueError("Mini NPZ has an invalid reference depth")
-    return reference_depth
-
-
 def prepare_depth_values(depth):
     import numpy as np
 
@@ -725,6 +705,13 @@ def prepare_depth_values(depth):
     return values
 
 
+def depth_displacement_values(depth):
+    """Convert raw DA3 camera distance to positive outward displacement."""
+    import numpy as np
+
+    return 1.0 - np.asarray(depth, dtype=np.float32)
+
+
 def camera_plane_bounds(
     source_object,
     depth,
@@ -1407,18 +1394,19 @@ def build_depth_plane(
     depth_frames_directory=None,
 ):
     source_name = source_object.name
-    depth_arrays = extract_depth_arrays(npz_path)
-    depth = depth_arrays[0]
+    raw_depth_arrays = extract_depth_arrays(npz_path)
+    raw_depth = raw_depth_arrays[0]
     intrinsics = extract_intrinsics_array(npz_path)
-    stored_reference_depth = extract_reference_depth(npz_path)
-    depth_values = prepare_depth_values(depth)
+    raw_depth_values = prepare_depth_values(raw_depth)
     bounds, reference_depth = camera_plane_bounds(
         source_object,
-        depth_values,
+        raw_depth_values,
         intrinsics,
         DISPLACEMENT_STRENGTH,
-        reference_depth=stored_reference_depth,
     )
+    depth_arrays = [
+        depth_displacement_values(frame) for frame in raw_depth_arrays
+    ]
     depth_name = depth_name or depth_data_name(source_object)
     frame_count = len(depth_arrays)
     foreground_image = (