几个几何操作的微小bug

backend/engine/cdsl_engine/runtime.py

@@ -831,9 +831,32 @@ def _execute_reference_axis(node: FeaturePlanNode, session: ExecutionSession) ->
     return session.result(node, context=axis)
 
 
+def _register_added_solid(
+    session: ExecutionSession,
+    node: FeaturePlanNode,
+    solid: Any,
+) -> None:
+    """Register an additive primitive solid (box/cyl/sphere/thread/gear/rack/bend).
+
+    When ``node.params['result_mode'] == "new_body"`` the primitive is kept as
+    an independent body member so that downstream ``boolean_bodies`` can
+    reference it without pulling in the accumulated fuse history. The current
+    body is replaced by a Compound that preserves both, matching the
+    ``extrude_add_blind`` ``new_body`` semantics. Any other value (including
+    missing) falls back to the legacy fuse-into-body behavior.
+    """
+    if node.params.get("result_mode") == "new_body":
+        combined = session.adapter.combine(session.body, solid)
+        members = {**session.body_members, node.feature_id: solid}
+        session.register_body(node.feature_id, combined, replay_node=node, body_members=members)
+        return
+    fused = session.adapter.fuse(session.body, solid)
+    session.register_body(node.feature_id, fused, replay_node=node)
+
+
 def _execute_sphere(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
     # 球体特征（sphere_add）执行入口：按球心与半径生成球体并并入当前主体。
-    
+
     # 1. 解析参数：半径 radius_mm 与球心 center_mm。
     radius = float(node.params.get("radius_mm") or 0.0)
     center = node.params.get("center_mm") or []
@@ -843,7 +866,7 @@ def _execute_sphere(node: FeaturePlanNode, session: ExecutionSession) -> Feature
     # 3. 由适配器创建球体实体。
     solid = session.adapter.sphere(radius, (float(center[0]), float(center[1]), float(center[2])))
     # 4. 球体与当前主体做布尔并（fuse）后登记为新主体，并返回该特征的结果对象。
-    session.register_body(node.feature_id, session.adapter.fuse(session.body, solid), replay_node=node)
+    _register_added_solid(session, node, solid)
     return session.result(node)
 
 
@@ -869,7 +892,7 @@ def _execute_box(node: FeaturePlanNode, session: ExecutionSession) -> FeatureRes
     plane = PlaneSpec.from_mapping({"origin_mm": corner, "x_dir": [1, 0, 0], "normal": [0, 0, 1]})
     solid = session.adapter.box(length, width, height, plane)
     # 3. 与当前主体做布尔并后登记为新主体，并返回该特征的结果对象。
-    session.register_body(node.feature_id, session.adapter.fuse(session.body, solid), replay_node=node)
+    _register_added_solid(session, node, solid)
     return session.result(node)
 
 
@@ -893,7 +916,7 @@ def _execute_cylinder(node: FeaturePlanNode, session: ExecutionSession) -> Featu
     # 2. 由适配器创建原生圆柱（axis=None 即世界 +Z 过原点）。
     solid = session.adapter.cylinder(radius, height, axis)
     # 3. 与当前主体做布尔并后登记为新主体，并返回该特征的结果对象。
-    session.register_body(node.feature_id, session.adapter.fuse(session.body, solid), replay_node=node)
+    _register_added_solid(session, node, solid)
     return session.result(node)
 
 
@@ -904,7 +927,7 @@ def _execute_thread(node: FeaturePlanNode, session: ExecutionSession) -> Feature
     # 2. 由适配器门面生成沿 spec.axis 放置的外螺纹实心段。
     solid = session.adapter.thread_solid(spec)
     # 3. 与当前主体做布尔并（fuse）后登记为新主体，并返回该特征的结果对象。
-    session.register_body(node.feature_id, session.adapter.fuse(session.body, solid), replay_node=node)
+    _register_added_solid(session, node, solid)
     return session.result(node)
 
 
@@ -938,7 +961,7 @@ def _execute_bend(node: FeaturePlanNode, session: ExecutionSession) -> FeatureRe
     # 2. 由适配器门面生成沿 spec.frame 放置的折弯实心段。
     solid = session.adapter.bend_solid(spec)
     # 3. 与当前主体做布尔并（fuse）后登记为新主体，并返回该特征的结果对象。
-    session.register_body(node.feature_id, session.adapter.fuse(session.body, solid), replay_node=node)
+    _register_added_solid(session, node, solid)
     return session.result(node)
 
 
@@ -955,7 +978,7 @@ def _execute_gear(node: FeaturePlanNode, session: ExecutionSession) -> FeatureRe
     # 2. 由适配器门面生成沿 spec.axis 放置的齿轮实体（直齿/斜齿/人字齿）。
     solid = session.adapter.gear_solid(spec)
     # 3. 与当前主体做布尔并（fuse）后登记为新主体，并返回该特征的结果对象。
-    session.register_body(node.feature_id, session.adapter.fuse(session.body, solid), replay_node=node)
+    _register_added_solid(session, node, solid)
     # 4. 小齿数根切风险：不阻断执行，附加 info 级诊断供完成报告如实披露。
     diagnostics: list[RuntimeDiagnostic] = []
     if spec.teeth_count < 17:
@@ -983,7 +1006,7 @@ def _execute_rack(node: FeaturePlanNode, session: ExecutionSession) -> FeatureRe
     # 2. 由适配器门面生成沿 spec.axis 放置的齿条实体（齿沿轴方向伸出）。
     solid = session.adapter.rack_solid(spec)
     # 3. 与当前主体做布尔并（fuse）后登记为新主体，并返回该特征的结果对象。
-    session.register_body(node.feature_id, session.adapter.fuse(session.body, solid), replay_node=node)
+    _register_added_solid(session, node, solid)
     return session.result(node)