init

backend/app/services/file_parser.py

@@ -0,0 +1,62 @@
+import logging
+from dataclasses import dataclass
+
+import trimesh
+
+logger = logging.getLogger("app.services.file_parser")
+
+
+@dataclass
+class FileInfo:
+    volume_cm3: float
+    surface_area_cm2: float
+    bounding_box_mm: dict[str, float]
+    is_watertight: bool
+    triangle_count: int
+
+
+SUPPORTED_EXTENSIONS = {".stl", ".3mf", ".obj"}
+
+
+def parse_3d_file(file_path: str, file_extension: str) -> FileInfo:
+    """Parse a 3D file and return geometric properties."""
+    ext = file_extension.lower().lstrip(".")
+    logger.info("Parsing 3D file: path=%s, extension=%s", file_path, ext)
+
+    logger.debug("Loading mesh with trimesh (file_type=%s)...", ext)
+    mesh = trimesh.load(file_path, file_type=ext)
+    logger.debug("Trimesh loaded object type: %s", type(mesh).__name__)
+
+    if isinstance(mesh, trimesh.Scene):
+        meshes = list(mesh.dump())
+        logger.info("File is a Scene with %d geometries, concatenating...", len(meshes))
+        if not meshes:
+            logger.error("Scene contains no geometries")
+            raise ValueError("Файл не содержит 3D-геометрии")
+        mesh = trimesh.util.concatenate(meshes)
+        logger.debug("Concatenated into single Trimesh")
+
+    if not isinstance(mesh, trimesh.Trimesh):
+        logger.error("Could not extract Trimesh object, got: %s", type(mesh).__name__)
+        raise ValueError("Не удалось извлечь 3D-геометрию из файла")
+
+    volume_cm3 = abs(mesh.volume) / 1000.0
+    surface_area_cm2 = mesh.area / 100.0
+    bbox = {
+        "x": round(float(mesh.bounding_box.extents[0]), 2),
+        "y": round(float(mesh.bounding_box.extents[1]), 2),
+        "z": round(float(mesh.bounding_box.extents[2]), 2),
+    }
+    is_watertight = bool(mesh.is_watertight)
+    triangle_count = len(mesh.faces)
+
+    logger.info("Parse result: volume=%.2f cm3, area=%.2f cm2, bbox=%s, watertight=%s, triangles=%d",
+                volume_cm3, surface_area_cm2, bbox, is_watertight, triangle_count)
+
+    return FileInfo(
+        volume_cm3=volume_cm3,
+        surface_area_cm2=surface_area_cm2,
+        bounding_box_mm=bbox,
+        is_watertight=is_watertight,
+        triangle_count=triangle_count,
+    )