rotate

core/nodeslicer/nodes/path.py

@@ -4,7 +4,7 @@ import numpy as np
 
 from ..bpy_ns_types import NfEnumProperty, NfBoolProperty, notify_tree_changed
 from ....registry import register_class
-from .base import SliceNode, SlicePaths, SlicingObject, SlicingCollection, slice_at_range, SliceNodeJoiner
+from .base import SliceNode, SlicePaths, SlicingObject, SlicingCollection, slice_at_range, SliceNodeJoiner, SlicingGroup
 
 @register_class
 class SLICENODE_GetPaths(SliceNode):
@@ -44,13 +44,21 @@ class SLICENODE_SliceShells(SliceNode):
     def evaluate_output(self, socket_name: str, **_kwargs) -> SlicePaths:
         if socket_name != "Paths": return SlicePaths()
 
-        coll: SlicingCollection | None = self.resolve("Mesh")
+        coll: SlicingCollection | SlicingGroup | None = self.resolve("Mesh")
         layer_height: float = self.resolve("Layer Height")
         rotation: Any = self.resolve("Rotation") or (0.0, 0.0, 0.0)
 
         if not coll: return SlicePaths()
 
-        merged_object = SlicingObject.merge(coll.objects)
+        # Handle SlicingGroup flattening
+        if isinstance(coll, SlicingGroup):
+            objects = []
+            for c in coll.collections.values():
+                objects.extend(c.objects)
+        else:
+            objects = coll.objects
+
+        merged_object = SlicingObject.merge(objects)
 
         if rotation and any(rotation):
             from mathutils import Euler
@@ -127,6 +135,27 @@ class SLICENODE_PathOffset(SliceNode):
         
         return paths.offset(np.array(offset, dtype=np.float32))
 
+@register_class
+class SLICENODE_RotatePath(SliceNode):
+    bl_label = "Rotate Path"
+
+    def init(self, context):
+        self.add_input("SLICESOCK_Paths", "Paths")
+        self.add_input("SLICESOCK_Float", "Angle").value = 0.0
+        self.add_input("SLICESOCK_Vector", "Center")
+        self.add_output("SLICESOCK_Paths", "Paths")
+
+    def evaluate_output(self, socket_name: str, **_kwargs) -> Any:
+        paths: SlicePaths = self.resolve("Paths")
+        angle: float = self.resolve("Angle") or 0.0
+        center: Any = self.resolve("Center")
+
+        if not paths: return SlicePaths()
+
+        center_vec = np.array(center, dtype=np.float32) if center and any(center) else None
+        
+        return paths.rotate(angle, center=center_vec)
+
 @register_class
 class SLICENODE_BufferShellsMultiple(SliceNode):
     bl_label = "Buffer Shells Multiple"

core/nodeslicer/tree.py

@@ -505,6 +505,7 @@ class SLICENODE_MT_Geometry(Menu):
         layout.operator("node.add_node", text="Buffer Shells").type = "SLICENODE_BufferShells"
         layout.operator("node.add_node", text="Buffer Shells Multiple").type = "SLICENODE_BufferShellsMultiple"
         layout.operator("node.add_node", text="Path Offset").type = "SLICENODE_PathOffset"
+        layout.operator("node.add_node", text="Rotate Path").type = "SLICENODE_RotatePath"
         layout.operator("node.add_node", text="Infill").type = "SLICENODE_Infill"
         layout.operator("node.add_node", text="Boolean Paths").type = "SLICENODE_JoinSlices"
         layout.separator()

core/slice.py

@@ -102,6 +102,50 @@ class SlicePaths(list[np.ndarray]):
         
         return new_paths
 
+    def rotate(self, angle_deg: float, center: np.ndarray | None = None) -> SlicePaths:
+        """Rotates the paths around Z-axis."""
+        if angle_deg == 0:
+            return self
+            
+        if center is None:
+            center = self.get_first_layer_midpoint()
+            
+        angle_rad = np.radians(angle_deg)
+        c, s = np.cos(angle_rad), np.sin(angle_rad)
+        rot_mat = np.array([
+            [c, -s, 0],
+            [s,  c, 0],
+            [0,  0, 1]
+        ], dtype=np.float32)
+
+        new_paths = []
+        for p in self:
+            # Shift to center, rotate, shift back
+            new_p = (p - center) @ rot_mat.T + center
+            new_paths.append(new_p)
+            
+        return self.copy_with(new_paths)
+
+    def get_first_layer_midpoint(self) -> np.ndarray:
+        if not self:
+            return np.zeros(3)
+        
+        # Find minimum group index
+        min_g = min(self.groups)
+        first_layer_indices = [i for i, g in enumerate(self.groups) if g == min_g]
+        
+        all_pts = []
+        for i in first_layer_indices:
+            all_pts.append(self[i])
+            
+        if not all_pts:
+            return np.zeros(3)
+            
+        pts = np.concatenate(all_pts)
+        min_pts = np.min(pts, axis=0)
+        max_pts = np.max(pts, axis=0)
+        return (min_pts + max_pts) / 2.0
+
     def boolean(self, other: SlicePaths, operation: str = 'UNION', connect_along_boundary: bool = False) -> SlicePaths:
         return boolean_slice(self, other, operation, connect_along_boundary=connect_along_boundary)
 
@@ -840,10 +884,10 @@ class Pather(object):
                 gcode.append(f";AFTER_LAYER_CHANGE")
                 last_z = z0
 
-            gcode.append(f"G0 X{x0:.3f} Y{y0:.3f} Z{z0:.3f}")
-            old_x, old_y, old_z = x0, y0, z0
+            old_fr = f_rate[0] if f_rate[0] > 0 else self.feedrate
+            gcode.append(f"G0 X{x0:.3f} Y{y0:.3f} Z{z0:.3f} F{old_fr}")
 
-            old_fr = 0
+            old_x, old_y, old_z = x0, y0, z0
             old_extras = {prefix: None for prefix in extras}
             for j, (p1, p2) in enumerate(zip(coords, coords[1:])):
                 seg_len: float = segment_length_3d(p1, p2)

doc/NODES.md

@@ -57,6 +57,10 @@ All nodes are found in the **Add (Shift+A)** menu under the **SliceNodes** categ
     - **Extrusion Multiplier Attribute**: Mesh attribute to use for per-segment extrusion rates.
     - **Feedrate Attribute**: Mesh attribute to use for per-segment feedrates.
     - **Extra Attributes**: Dictionary mapping mesh attribute names to custom G-code prefixes (e.g., `opening_size` -> `S`).
+- **Path Offset**: Offsets `SlicePaths` by a 3D vector.
+- **Rotate Path**: Rotates `SlicePaths` around the Z-axis.
+    - **Angle**: Rotation angle in degrees.
+    - **Center**: Optional center of rotation. If not provided, it defaults to the midpoint of the first layer.
 - **Slice Shells**: Slices a `SlicingObject` into 2D `SlicePaths` at a given layer height. Supports rotation for slicing at an angle.
 - **Buffer Shells**: Offsets/buffers 2D `SlicePaths`. Supports rotated offsetting and multiple miter types.
 - **Infill**: Generates a cross-hatch grid or parallel lines clipped by boundary paths. 

gcode_snippets/concrete_printer_header.gcode

@@ -0,0 +1,14 @@
+G90
+M83
+; process 25mm-TRUE
+; layer 1, Z = 10.000
+T0
+G92 E0.0000
+G1 E-2.0000 F4800
+; feature inner perimeter
+; tool H10.000 W29.700
+G1 Z15.000 F6000
+G1 X755.261 Y904.113 F6000
+G1 Z10.000 F6000
+G1 E0.0000 F4800
+G92 E0.0000