x

src/core/multi_scheme_planner.py

@@ -113,6 +113,7 @@ class MultiSchemeMoldPlanner:
         undercut_regions = generator._build_undercut_regions(
             side_action_result.get("undercut_analysis", {})
         )
+        mold_structure = self._determine_mold_structure(analysis, undercut_regions)
 
         scaled_shape = generator._apply_shrinkage_compensation(shape)
         drafted_shape = generator._apply_draft_angles(scaled_shape, parting_surface)
@@ -150,6 +151,9 @@ class MultiSchemeMoldPlanner:
         cavity_data["metadata"]["scheme_reason"] = candidate["reason"]
         cavity_data["metadata"]["scheme_offset_ratio"] = candidate.get("offset_ratio", 0.0)
         cavity_data["metadata"]["scheme_offset_label"] = candidate.get("offset_label", "中面")
+        cavity_data["metadata"]["mold_structure_type"] = mold_structure["mold_structure_type"]
+        cavity_data["metadata"]["core_required"] = mold_structure["core_required"]
+        cavity_data["metadata"]["structure_decision_reason"] = mold_structure["decision_reason"]
 
         return {
             "scheme_id": candidate["scheme_id"],
@@ -161,6 +165,9 @@ class MultiSchemeMoldPlanner:
             "normal_alignment_score": candidate.get("normal_alignment_score"),
             "offset_ratio": candidate.get("offset_ratio", 0.0),
             "offset_label": candidate.get("offset_label", "中面"),
+            "mold_structure_type": mold_structure["mold_structure_type"],
+            "core_required": mold_structure["core_required"],
+            "decision_reason": mold_structure["decision_reason"],
             "parting": {
                 "axis": candidate["axis"],
                 "direction": parting_direction,
@@ -273,3 +280,40 @@ class MultiSchemeMoldPlanner:
             axis: round(value / total * 100, 2)
             for axis, value in stats.items()
         }
+
+    @staticmethod
+    def _determine_mold_structure(analysis: Dict[str, Any], undercut_regions: List[Dict[str, Any]]) -> Dict[str, Any]:
+        """
+        判定是否需要独立模芯。
+        规则为工程启发式：
+        - 实心度高 + 平均厚度占比高 + 无明显倒扣：倾向两板半腔（无独立凸芯）
+        - 否则：采用型腔+模芯结构
+        """
+        dims = analysis.get("bounding_box", {}).get("dimensions", [0.0, 0.0, 0.0])
+        valid_dims = [float(d) for d in dims if float(d) > 1e-6]
+        min_dim = min(valid_dims) if valid_dims else 1.0
+        bbox_volume = 1.0
+        for dim in valid_dims[:3]:
+            bbox_volume *= dim
+        if bbox_volume <= 0:
+            bbox_volume = 1.0
+
+        volume = float(analysis.get("volume", 0.0))
+        surface_area = float(analysis.get("surface_area", 0.0))
+        solid_ratio = max(0.0, min(volume / bbox_volume, 1.0))
+        avg_wall = (2.0 * volume / surface_area) if surface_area > 1e-6 else min_dim
+        wall_ratio = max(0.0, min(avg_wall / max(min_dim, 1e-6), 1.0))
+        undercut_count = len(undercut_regions or [])
+
+        core_required = not (solid_ratio > 0.62 and wall_ratio > 0.38 and undercut_count == 0)
+        mold_structure_type = "cavity_core" if core_required else "two_half_cavity"
+        decision_reason = (
+            f"solid_ratio={solid_ratio:.2f}, wall_ratio={wall_ratio:.2f}, "
+            f"undercut_count={undercut_count}"
+        )
+
+        return {
+            "core_required": core_required,
+            "mold_structure_type": mold_structure_type,
+            "decision_reason": decision_reason,
+        }