优化生成流程

backend/engine/cdsl_engine/build123d_adapter.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 import math
 from typing import Any, Iterable
 
-from build123d import Axis, Edge, Face, Plane, Solid, Vector, Wire, export_step
+from build123d import Axis, Compound, Edge, Face, Plane, Solid, Vector, Wire, export_step
 
 from .runtime_types import AxisSpec, HoleSpec, PlaneSpec, TopologyRecord, Vector3, canonical_plane_signature
 
@@ -201,13 +201,23 @@ class Build123dGeometryAdapter:
     def revolve(face: Face, angle_deg: float, axis: AxisSpec) -> Solid:
         return Solid.revolve(face, angle_deg, Build123dGeometryAdapter.axis(axis))
 
+    @staticmethod
+    def _body_shape(value: Any) -> Any:
+        """Normalize boolean results, including disconnected ShapeList values."""
+        if hasattr(value, "bounding_box"):
+            return value
+        shapes = list(value)
+        if not shapes:
+            raise ValueError("Boolean operation produced no shapes")
+        return shapes[0] if len(shapes) == 1 else Compound(shapes)
+
     @staticmethod
     def fuse(body: Any | None, solid: Solid) -> Any:
-        return solid if body is None else body.fuse(solid)
+        return solid if body is None else Build123dGeometryAdapter._body_shape(body.fuse(solid))
 
     @staticmethod
     def cut(body: Any, tool: Any) -> Any:
-        return body.cut(tool)
+        return Build123dGeometryAdapter._body_shape(body.cut(tool))
 
     @staticmethod
     def sphere(radius_mm: float, center_mm: Vector3) -> Solid: