transforms

core/nodeslicer/nodes/mesh.py

@@ -415,11 +415,13 @@ def _copy_slicing_object(so: SlicingObject) -> SlicingObject:
     new_so.object_type = so.object_type
     new_so.modifiers = so.modifiers.copy() if so.modifiers else []
     new_so.extruder = so.extruder
+    new_so.transforms = [dict(t) for t in getattr(so, "transforms", [])]
     return new_so
 
 def _copy_slicing_collection(sc: SlicingCollection) -> SlicingCollection:
     new_sc = SlicingCollection([], sc.name)
     new_sc.objects = [_copy_slicing_object(so) for so in sc.objects]
+    new_sc.transforms = [dict(t) for t in getattr(sc, "transforms", [])]
     return new_sc
 
 def _copy_slicing_group(sg: SlicingGroup) -> SlicingGroup:
@@ -428,6 +430,7 @@ def _copy_slicing_group(sg: SlicingGroup) -> SlicingGroup:
     new_sg.wipe_tower_xy = sg.wipe_tower_xy.copy()
     new_sg.wipe_tower_rotation_deg = sg.wipe_tower_rotation_deg
     new_sg.object_offset = sg.object_offset.copy()
+    new_sg.transforms = [dict(t) for t in getattr(sg, "transforms", [])]
     return new_sg
 
 
@@ -488,6 +491,16 @@ class SLICENODE_TransformGeometry(SliceNode):
             if any(t != 0.0 for t in t_arr):
                 copied_data.offset(t_arr)
 
+        t_rec = {
+            "type": "transform_geometry",
+            "translation": (float(t_arr[0]), float(t_arr[1]), float(t_arr[2])),
+            "rotation": (float(r_arr[0]), float(r_arr[1]), float(r_arr[2])),
+            "scale": (float(s_arr[0]), float(s_arr[1]), float(s_arr[2])),
+        }
+        if not hasattr(copied_data, "transforms"):
+            copied_data.transforms = []
+        copied_data.transforms.append(t_rec)
+
         return copied_data
 
 
@@ -501,8 +514,6 @@ class SLICENODE_DropGeometry(SliceNode):
         self.add_output("SLICESOCK_Mesh", "Mesh")
 
     def evaluate_output(self, socket_name: str, **_kwargs) -> SlicingCollection | SlicingGroup | None:
-        
-        z=self.resolve('Z')
         if socket_name != "Mesh":
             return None
 
@@ -510,8 +521,31 @@ class SLICENODE_DropGeometry(SliceNode):
         if not mesh_data:
             return None
 
-        assert mesh_data.min_z is not None
-        min_z = round(mesh_data.min_z , 6)
-        mesh_data.offset(np.array([0.0, 0.0, z-min_z], dtype=np.float64))
+        z = self.resolve('Z')
+        if z is None:
+            z = 0.0
 
-        return mesh_data
+        assert mesh_data.min_z is not None
+        min_z = round(mesh_data.min_z, 6)
+        offset_z = float(z - min_z)
+
+        if isinstance(mesh_data, SlicingGroup):
+            copied_data = _copy_slicing_group(mesh_data)
+        else:
+            copied_data = _copy_slicing_collection(mesh_data)
+
+        copied_data.offset(np.array([0.0, 0.0, offset_z], dtype=np.float64))
+
+        drop_rec = {
+            "type": "drop_geometry",
+            "target_z": float(z),
+            "offset_z": float(offset_z),
+            "translation": (0.0, 0.0, float(offset_z)),
+            "rotation": (0.0, 0.0, 0.0),
+            "scale": (1.0, 1.0, 1.0),
+        }
+        if not hasattr(copied_data, "transforms"):
+            copied_data.transforms = []
+        copied_data.transforms.append(drop_rec)
+
+        return copied_data

core/nodeslicer/nodes/path.py

@@ -29,7 +29,10 @@ class SLICENODE_GetPaths(SliceNode):
         from ....infra.blender.blender_mesh_capture import capture_mesh_edges
         so, e_rates, f_rates, extra_attrs_data = capture_mesh_edges(obj, e_attr_name, f_attr_name, extra_attrs)
 
-        return SlicePaths(so, extrusion_rate=e_rates, feedrate=f_rates, extra_attributes=extra_attrs_data)
+        sp = SlicePaths(so, extrusion_rate=e_rates, feedrate=f_rates, extra_attributes=extra_attrs_data)
+        if hasattr(obj, "transforms"):
+            sp.transforms = list(getattr(obj, "transforms", []))
+        return sp
 
 @register_class
 class SLICENODE_SliceShells(SliceNode):
@@ -104,6 +107,7 @@ class SLICENODE_SliceShells(SliceNode):
         slices.layer_height = layer_height
         if fl_height is not None:
             slices.first_layer_height = fl_height
+        slices.transforms = list(getattr(coll, "transforms", [])) or list(getattr(merged_object, "transforms", []))
 
         if len(z_values) > 0 and fl_height is not None and layer_height > 0:
             mult = fl_height / layer_height

core/nodeslicer/nodes/preview.py

@@ -53,6 +53,10 @@ class SLICENODE_GcodeToMesh(ExecSliceNode):
         def segment_length_3d(p1, p2) -> float:
             return ((p2[0]-p1[0])**2 + (p2[1]-p1[1])**2 + (p2[2]-p1[2])**2)**0.5
 
+        prep_translation = [0.0, 0.0, 0.0]
+        prep_rotation = [0.0, 0.0, 0.0]
+        prep_scale = [1.0, 1.0, 1.0]
+
         for line in gcode.splitlines():
             # Parse metadata from comments
             if ';' in line:
@@ -72,6 +76,21 @@ class SLICENODE_GcodeToMesh(ExecSliceNode):
                 elif comment.startswith("DEFAULT_LAYER_WIDTH="):
                     try: default_layer_width = float(comment.split('=')[1])
                     except ValueError: pass
+                elif comment.startswith("PREPARATION_TOTAL_TRANSLATION="):
+                    try:
+                        vals = [float(v) for v in comment.split('=')[1].split(',')]
+                        if len(vals) >= 3: prep_translation = vals[:3]
+                    except ValueError: pass
+                elif comment.startswith("PREPARATION_TOTAL_ROTATION="):
+                    try:
+                        vals = [float(v) for v in comment.split('=')[1].split(',')]
+                        if len(vals) >= 3: prep_rotation = vals[:3]
+                    except ValueError: pass
+                elif comment.startswith("PREPARATION_TOTAL_SCALE="):
+                    try:
+                        vals = [float(v) for v in comment.split('=')[1].split(',')]
+                        if len(vals) >= 3: prep_scale = vals[:3]
+                    except ValueError: pass
 
             line_no_comment = line.split(';')[0].strip()
             if not line_no_comment: continue
@@ -97,7 +116,7 @@ class SLICENODE_GcodeToMesh(ExecSliceNode):
             new_e = params.get('E', last_e)
 
             show = False
-            if self.show_e_0: show = True
+            if getattr(self, "show_e_0", False): show = True
             if cmd == 'G1' and new_e > 0: show = True
 
             if show:
@@ -140,16 +159,19 @@ class SLICENODE_GcodeToMesh(ExecSliceNode):
         if not vertices:
             return
 
+        import sys
+        real_bpy = sys.modules.get('bpy', bpy)
+
         # Create or find "Debug" mesh object
-        if mesh_name in bpy.data.objects:
-            obj = bpy.data.objects[mesh_name]
+        if mesh_name in real_bpy.data.objects:
+            obj = real_bpy.data.objects[mesh_name]
             mesh = obj.data
             mesh.clear_geometry()
         else:
-            mesh = bpy.data.meshes.new(mesh_name)
-            obj = bpy.data.objects.new(mesh_name, mesh)
-            assert bpy.context.collection
-            bpy.context.collection.objects.link(obj)
+            mesh = real_bpy.data.meshes.new(mesh_name)
+            obj = real_bpy.data.objects.new(mesh_name, mesh)
+            assert real_bpy.context.collection
+            real_bpy.context.collection.objects.link(obj)
 
         mesh.from_pydata(vertices, edges, [])
 
@@ -164,60 +186,126 @@ class SLICENODE_GcodeToMesh(ExecSliceNode):
 
         # Assign Geometry Nodes nodegroup for preview
         ng_name = "Nonplanar Slicing Preview"
-        if ng_name not in bpy.data.node_groups:
+        if ng_name not in real_bpy.data.node_groups:
             # Try to load it from nodes.blend in the addon root
             addon_dir = os.path.dirname(os.path.dirname(os.path.dirname(os.path.dirname(__file__))))
             blend_path = os.path.join(addon_dir, "nodes.blend")
             if os.path.exists(blend_path):
                 try:
-                    with bpy.data.libraries.load(blend_path) as (data_from, data_to):
+                    with real_bpy.data.libraries.load(blend_path) as (data_from, data_to):
                         if ng_name in data_from.node_groups:
                             data_to.node_groups = [ng_name]
                 except Exception as e:
                     if operator: operator.report({'WARNING'}, f"Failed to load preview node group: {e}")
 
-        if ng_name in bpy.data.node_groups:
-            ng = bpy.data.node_groups[ng_name]
-            # Check if already assigned
-            mod = None
-            for m in obj.modifiers:
-                if m.type == 'NODES' and m.node_group == ng: # type: ignore
-                    mod = m
-                    break
-            
-            if not mod:
-                mod = obj.modifiers.new(name="Preview", type='NODES') # type: ignore
-                mod.node_group = ng
+        # Find or assign Preview modifier
+        mod = None
+        ng = real_bpy.data.node_groups.get(ng_name) if hasattr(real_bpy.data, "node_groups") and hasattr(real_bpy.data.node_groups, "get") else None
 
-                # Helper to find socket identifiers by name, falling back to specified key
-                def find_socket_key(node_group, name: str, fallback: str) -> str:
-                    if hasattr(node_group, "interface") and node_group.interface:
+        if hasattr(obj, "modifiers"):
+            if "Preview" in obj.modifiers:
+                mod = obj.modifiers["Preview"]
+            else:
+                for m in obj.modifiers:
+                    if getattr(m, "type", "") == 'NODES':
+                        if ng and getattr(m, "node_group", None) == ng:
+                            mod = m
+                            break
+                        elif mod is None:
+                            mod = m
+
+        if not mod and ng:
+            mod = obj.modifiers.new(name="Preview", type='NODES') # type: ignore
+            mod.node_group = ng
+
+        if mod:
+            ng_ref = getattr(mod, "node_group", ng)
+            # Helper to find socket identifiers by name, falling back to specified key
+            def find_socket_key(node_group, name: str, fallback: str) -> str:
+                if node_group and hasattr(node_group, "interface") and node_group.interface:
+                    try:
+                        items = getattr(node_group.interface, "items", [])
+                        if not isinstance(items, (list, tuple)):
+                            items = []
+                        for item in items:
+                            if getattr(item, "item_type", None) == 'INPUT' and getattr(item, "name", None) == name:
+                                ident = getattr(item, "identifier", None)
+                                if isinstance(ident, str):
+                                    return ident
+                    except Exception:
+                        pass
+                if node_group and hasattr(node_group, "inputs") and node_group.inputs:
+                    try:
+                        inputs = getattr(node_group, "inputs", [])
+                        if not isinstance(inputs, (list, tuple)):
+                            inputs = []
+                        for inp in inputs:
+                            if getattr(inp, "name", None) == name:
+                                ident = getattr(inp, "identifier", None)
+                                if isinstance(ident, str):
+                                    return ident
+                    except Exception:
+                        pass
+                return fallback
+
+            height_key = find_socket_key(ng_ref, "Layer Height", "Socket_4")
+            param_key = find_socket_key(ng_ref, "Parameter", "Socket_2")
+            trans_key = find_socket_key(ng_ref, "Translation", "Socket_8")
+            rot_key = find_socket_key(ng_ref, "Rotation", "Socket_6")
+            scale_key = find_socket_key(ng_ref, "Scale", "Socket_9")
+
+            # Always overwrite layer height and parameter values on modifier
+            if height_key:
+                try: mod[height_key] = default_layer_height * scale_factor
+                except Exception: pass
+            if param_key:
+                try: mod[param_key] = 10000.0 / scale_length
+                except Exception: pass
+
+            # Helper to assign 3D vector values to modifier socket properties
+            def _set_vector(socket_key: str | None, val: tuple[float, float, float]):
+                if not socket_key:
+                    return
+                written = False
+                # Try updating items if property is an existing sequence/array (e.g. IDPropertyArray or Vector)
+                try:
+                    prop = mod.get(socket_key) if hasattr(mod, "get") else None
+                    if prop is not None and hasattr(prop, "__getitem__"):
                         try:
-                            for item in node_group.interface.items:
-                                if getattr(item, "item_type", None) == 'INPUT' and item.name == name:
-                                    return item.identifier
+                            prop[0] = float(val[0])
+                            prop[1] = float(val[1])
+                            prop[2] = float(val[2])
+                            written = True
                         except Exception:
                             pass
-                    if hasattr(node_group, "inputs") and node_group.inputs:
+                except Exception:
+                    pass
+
+                # Try direct tuple/sequence assignment
+                if not written:
+                    try:
+                        mod[socket_key] = val
+                        written = True
+                    except Exception:
                         try:
-                            for inp in node_group.inputs:
-                                if inp.name == name:
-                                    return inp.identifier
+                            mod[socket_key] = [val[0], val[1], val[2]]
+                            written = True
                         except Exception:
                             pass
-                    return fallback
 
-                height_key = find_socket_key(ng, "Layer Height", "Socket_4")
-                width_key = find_socket_key(ng, "Layer Width", "Socket_3")
-                param_key = find_socket_key(ng, "Parameter", "Socket_2")
+            # Always overwrite Translation (Socket_8), Rotation (Socket_6), Scale (Socket_9)
+            translation_val = (float(prep_translation[0]) * 0.001, float(prep_translation[1]) * 0.001, float(prep_translation[2]) * 0.001)
+            rotation_val = (float(prep_rotation[0]), float(prep_rotation[1]), float(prep_rotation[2]))
+            scale_val = (float(prep_scale[0]), float(prep_scale[1]), float(prep_scale[2]))
 
-                # Set the values on the modifier
-                if height_key:
-                    mod[height_key] = default_layer_height * scale_factor
-                if width_key:
-                    mod[width_key] = default_layer_width * scale_factor
-                if param_key:
-                    mod[param_key] = 10000.0 / scale_length
+            _set_vector(trans_key, translation_val)
+            _set_vector("Socket_8", translation_val)
+
+            _set_vector(rot_key, rotation_val)
+            _set_vector("Socket_6", rotation_val)
+
+            _set_vector(scale_key, scale_val)
+            _set_vector("Socket_9", scale_val)
 
     def evaluate(self, operator=None):
         gcodes = self.resolve_multi_input("Gcode")

core/slice.py

@@ -159,8 +159,9 @@ class SlicePaths(list[np.ndarray]):
     extra_attributes: dict[str, list[np.ndarray]]
     layer_height: float
     first_layer_height: float | None
+    transforms: list[dict]
 
-    def __init__(self, paths: list[np.ndarray] = [], groups: list[int] = [], extrusion_rate: list[np.ndarray] | None = None, feedrate: list[np.ndarray] | None = None, extra_attributes: dict[str, list[np.ndarray]] | None = None, layer_height: float = 0.2, first_layer_height: float | None = None):
+    def __init__(self, paths: list[np.ndarray] = [], groups: list[int] = [], extrusion_rate: list[np.ndarray] | None = None, feedrate: list[np.ndarray] | None = None, extra_attributes: dict[str, list[np.ndarray]] | None = None, layer_height: float = 0.2, first_layer_height: float | None = None, transforms: list[dict] | None = None):
         super().__init__(paths)
         
         self.groups = []
@@ -182,6 +183,7 @@ class SlicePaths(list[np.ndarray]):
         self.extra_attributes = extra_attributes or {}
         self.layer_height = layer_height
         self.first_layer_height = first_layer_height
+        self.transforms = list(transforms) if transforms is not None else []
     
     def copy_with(self, paths: list[np.ndarray], groups: list[int] | None = None, extrusion_rate: list[np.ndarray] | None = None, feedrate: list[np.ndarray] | None = None, extra_attributes: dict[str, list[np.ndarray]] | None = None) -> SlicePaths:
         """Returns a new SlicePaths object with new paths/groups, preserving all metadata and instance attributes."""
@@ -306,8 +308,13 @@ class SlicePaths(list[np.ndarray]):
         base = primary_source if primary_source is not None else paths_list[0]
         merged = base.copy_with([])
 
+        merged_transforms = []
         for sp in paths_list:
             merged.extend_with_groups(sp)
+            for t in getattr(sp, "transforms", []):
+                if t not in merged_transforms:
+                    merged_transforms.append(t)
+        merged.transforms = merged_transforms
 
         return merged
 
@@ -337,6 +344,13 @@ class SlicePaths(list[np.ndarray]):
                 for path, ext, feed, extra in items:
                     merged.append_with_group(path, group=g, extrusion_rate=ext, feedrate=feed, extra_attributes=extra)
 
+        merged_transforms = []
+        for sp in paths_list:
+            for t in getattr(sp, "transforms", []):
+                if t not in merged_transforms:
+                    merged_transforms.append(t)
+        merged.transforms = merged_transforms
+
         return merged
 
     def get_infill_mask(self) -> SlicePaths:
@@ -1562,6 +1576,7 @@ class Pather(object):
         self.retraction: float = 0.0
         self.retraction_feedrate: float = 0.0
         self.lift: float = 0.0
+        self.transforms: list[dict] = list(getattr(paths, "transforms", []))
 
     @property
     def layer_width(self) -> float:
@@ -1630,6 +1645,47 @@ class Pather(object):
                 f";DEFAULT_LAYER_WIDTH={self.layer_width:.6f}",
                 f";OFFSET_X={offset_x:.6f}",
                 f";OFFSET_Y={offset_y:.6f}",
+            ])
+
+            if hasattr(self, "transforms") and self.transforms:
+                import json
+                header.append(f";PREPARATION_TRANSFORMS={json.dumps(self.transforms)}")
+
+                total_tx, total_ty, total_tz = 0.0, 0.0, 0.0
+                total_rx, total_ry, total_rz = 0.0, 0.0, 0.0
+                total_sx, total_sy, total_sz = 1.0, 1.0, 1.0
+
+                for i, t in enumerate(self.transforms):
+                    t_type = t.get("type", "transform")
+                    tr = t.get("translation", (0.0, 0.0, 0.0))
+                    rot = t.get("rotation", (0.0, 0.0, 0.0))
+                    sc = t.get("scale", (1.0, 1.0, 1.0))
+
+                    total_tx += tr[0]
+                    total_ty += tr[1]
+                    total_tz += tr[2]
+                    total_rx += rot[0]
+                    total_ry += rot[1]
+                    total_rz += rot[2]
+                    total_sx *= sc[0]
+                    total_sy *= sc[1]
+                    total_sz *= sc[2]
+
+                    if t_type == "transform_geometry":
+                        header.append(f";TRANSFORM_GEOMETRY_{i}_TRANSLATION={tr[0]:.6f},{tr[1]:.6f},{tr[2]:.6f}")
+                        header.append(f";TRANSFORM_GEOMETRY_{i}_ROTATION={rot[0]:.6f},{rot[1]:.6f},{rot[2]:.6f}")
+                        header.append(f";TRANSFORM_GEOMETRY_{i}_SCALE={sc[0]:.6f},{sc[1]:.6f},{sc[2]:.6f}")
+                    elif t_type == "drop_geometry":
+                        target_z = t.get("target_z", 0.0)
+                        off_z = t.get("offset_z", 0.0)
+                        header.append(f";DROP_GEOMETRY_{i}_TARGET_Z={target_z:.6f}")
+                        header.append(f";DROP_GEOMETRY_{i}_OFFSET_Z={off_z:.6f}")
+
+                header.append(f";PREPARATION_TOTAL_TRANSLATION={total_tx:.6f},{total_ty:.6f},{total_tz:.6f}")
+                header.append(f";PREPARATION_TOTAL_ROTATION={total_rx:.6f},{total_ry:.6f},{total_rz:.6f}")
+                header.append(f";PREPARATION_TOTAL_SCALE={total_sx:.6f},{total_sy:.6f},{total_sz:.6f}")
+
+            header.extend([
                 "G21 ; set units to mm",
                 "G90 ; absolute XYZ positioning",
                 "M83 ; relative extrusion mode",

infra/blender/blender_mesh_capture.py

@@ -102,6 +102,7 @@ class SlicingObject():
         self.parent = parent
         self.attributes = {}
         self.modifiers = []
+        self.transforms = []
 
         assert bpy.context.scene.unit_settings
         scene_scale: float = bpy.context.scene.unit_settings.scale_length
@@ -127,6 +128,11 @@ class SlicingObject():
         merged.parent = objects[0].parent
         merged.object_type = objects[0].object_type
         merged.extruder = objects[0].extruder
+        merged.transforms = []
+        for o in objects:
+            for t in getattr(o, "transforms", []):
+                if t not in merged.transforms:
+                    merged.transforms.append(dict(t))
 
         valid_meshes = [o.mesh for o in objects if o.mesh.size]
         merged.mesh = np.concatenate(valid_meshes, axis=0) if valid_meshes else np.empty((0, 4, 3))
@@ -257,11 +263,13 @@ class SlicingObject():
 class SlicingCollection():
     name: str
     objects: list[SlicingObject]
+    transforms: list[dict]
 
     def __init__(self, objs: list[Object], parent: str):
         self.objects = [SlicingObject(obj, parent) for obj in objs]
         self.objects = [o for o in self.objects if o.mesh.size]
         self.name = parent
+        self.transforms = []
 
     def _clear_cache(self):
         for prop in ["all_verts", "unique_verts"]:
@@ -386,9 +394,11 @@ class SlicingGroup():
     wipe_tower_xy: NDArray = np.array([0, 0])
     wipe_tower_rotation_deg: float = 0
     object_offset: NDArray = np.array([0.0, 0.0, 0.0])
+    transforms: list[dict]
 
     def __init__(self, selected_objs: list[Object]) -> None:
         self.object_offset = np.array([0.0, 0.0, 0.0])
+        self.transforms = []
 
         family = []
         for obj in selected_objs:

tests/test_transform.py

@@ -34,12 +34,16 @@ mock_types.Menu = DummyMenu
 mock_types.Panel = DummyPanel
 mock_types.PropertyGroup = DummyPropertyGroup
 
-mock_bpy = MagicMock()
+if 'bpy' in sys.modules and isinstance(sys.modules['bpy'], MagicMock):
+    mock_bpy = sys.modules['bpy']
+else:
+    mock_bpy = MagicMock()
+    sys.modules['bpy'] = mock_bpy
+
 mock_bpy.context.scene = MagicMock()
 mock_bpy.context.scene.unit_settings.scale_length = 0.001
 mock_bpy.types = mock_types
 
-sys.modules['bpy'] = mock_bpy
 sys.modules['bpy.types'] = mock_types
 sys.modules['bpy.props'] = MagicMock()
 sys.modules['bpy.utils'] = MagicMock()
@@ -258,6 +262,109 @@ class TestTransform(unittest.TestCase):
         self.assertEqual(result_sc_2.min_z, 10.0)
         np.testing.assert_allclose(result_sc_2.objects[0].mesh[0, 0], [1.0, 2.0, 10.0])
 
+    def test_gcode_transform_metadata(self):
+        from NodeSlicer.core.nodeslicer.nodes.mesh import SLICENODE_TransformGeometry, SLICENODE_DropGeometry
+        from NodeSlicer.core.slice import SlicePaths, Pather
+
+        so = SlicingObject()
+        so.mesh = np.array([[[0.0, 0.0, 5.0],
+                             [10.0, 0.0, 5.0],
+                             [5.0, 10.0, 10.0],
+                             [0.0, 0.0, 1.0]]], dtype=np.float64)
+
+        sc = SlicingCollection([], "coll")
+        sc.objects = [so]
+
+        # 1. Transform Geometry
+        t_node = SLICENODE_TransformGeometry()
+        t_node.resolve = lambda f: {
+            "Mesh": sc,
+            "Translation": (10.0, 20.0, 0.0),
+            "Rotation": (0.0, 0.0, 0.0),
+            "Scale": (1.0, 1.0, 1.0)
+        }.get(f)
+
+        sc_transformed = t_node.evaluate_output("Mesh")
+        self.assertIsNotNone(sc_transformed)
+        self.assertEqual(len(sc_transformed.transforms), 1)
+        self.assertEqual(sc_transformed.transforms[0]["type"], "transform_geometry")
+
+        # 2. Drop Geometry
+        d_node = SLICENODE_DropGeometry()
+        d_node.resolve = lambda f: {
+            "Mesh": sc_transformed,
+            "Z": 0.0
+        }.get(f)
+
+        sc_dropped = d_node.evaluate_output("Mesh")
+        self.assertIsNotNone(sc_dropped)
+        self.assertEqual(len(sc_dropped.transforms), 2)
+        self.assertEqual(sc_dropped.transforms[1]["type"], "drop_geometry")
+
+        # 3. Create SlicePaths from geometry
+        path = np.array([[10.0, 20.0, 0.0], [20.0, 20.0, 0.0], [15.0, 30.0, 0.0]])
+        sp = SlicePaths([path], transforms=sc_dropped.transforms)
+
+        # 4. Generate G-code with Pather
+        pather = Pather(sp)
+        gcode = pather.to_gcode(include_header=True)
+
+        self.assertIn(";PREPARATION_TRANSFORMS=", gcode)
+        self.assertIn(";TRANSFORM_GEOMETRY_0_TRANSLATION=10.000000,20.000000,0.000000", gcode)
+        self.assertIn(";DROP_GEOMETRY_1_OFFSET_Z=-5.000000", gcode)
+        self.assertIn(";PREPARATION_TOTAL_TRANSLATION=10.000000,20.000000,-5.000000", gcode)
+
+        # 5. Process G-code with GcodeToMesh preview node
+        from NodeSlicer.core.nodeslicer.nodes.preview import SLICENODE_GcodeToMesh
+        preview_node = SLICENODE_GcodeToMesh()
+        preview_node.show_e_0 = True
+
+        mock_mod_dict = {}
+        class MockModifier:
+            type = 'NODES'
+            node_group = MagicMock()
+            def __getitem__(self, k): return mock_mod_dict.get(k)
+            def __setitem__(self, k, v): mock_mod_dict[k] = v
+            def get(self, k, default=None): return mock_mod_dict.get(k, default)
+
+        mock_obj = MagicMock()
+        mock_obj.type = 'MESH'
+        mock_obj.modifiers = [MockModifier()]
+
+        import sys
+        sys.modules['bpy'].data.objects = {"PreviewObj": mock_obj}
+        sys.modules['bpy'].data.node_groups = {"Nonplanar Slicing Preview": mock_obj.modifiers[0].node_group}
+
+        preview_node._process_gcode(gcode, "PreviewObj")
+
+        # Verify modifier sockets Socket_8, Socket_6, Socket_9
+        self.assertEqual(mock_mod_dict.get("Socket_8"), (0.01, 0.02, -0.005))
+        self.assertEqual(mock_mod_dict.get("Socket_6"), (0.0, 0.0, 0.0))
+
+        # Test overwriting on an existing mesh object with pre-existing modifier values
+        mock_mod_dict["Socket_8"] = [0.0, 0.0, 0.0]
+        mock_mod_dict["Socket_6"] = [1.0, 1.0, 1.0]
+        mock_mod_dict["Socket_9"] = [2.0, 2.0, 2.0]
+
+        preview_node._process_gcode(gcode, "PreviewObj")
+
+        self.assertEqual(tuple(mock_mod_dict.get("Socket_8")), (0.01, 0.02, -0.005))
+        self.assertEqual(tuple(mock_mod_dict.get("Socket_6")), (0.0, 0.0, 0.0))
+        self.assertEqual(tuple(mock_mod_dict.get("Socket_9")), (1.0, 1.0, 1.0))
+
+        # Test G-code with non-zero 3D rotation and non-uniform scale
+        gcode_rot = (
+            ";PREPARATION_TOTAL_TRANSLATION=10.000000,20.000000,30.000000\n"
+            ";PREPARATION_TOTAL_ROTATION=0.150000,0.250000,0.350000\n"
+            ";PREPARATION_TOTAL_SCALE=1.500000,2.000000,2.500000\n"
+            "G1 X10 Y20 Z30 E1\n"
+        )
+        preview_node._process_gcode(gcode_rot, "PreviewObj")
+        self.assertEqual(tuple(mock_mod_dict.get("Socket_8")), (0.01, 0.02, 0.03))
+        self.assertEqual(tuple(mock_mod_dict.get("Socket_6")), (0.15, 0.25, 0.35))
+        self.assertEqual(tuple(mock_mod_dict.get("Socket_9")), (1.5, 2.0, 2.5))
+
+
 if __name__ == '__main__':
     unittest.main()