up

core/nodeslicer/nodes.py

@@ -5,7 +5,7 @@ from typing import Any, TypeAlias
 import bpy
 import numpy as np
 from mathutils import Euler
-from bpy.props import StringProperty, FloatProperty, IntProperty, EnumProperty
+from bpy.props import StringProperty, FloatProperty, IntProperty, EnumProperty, BoolProperty
 
 from ...registry import register_class
 from .. import slice
@@ -384,6 +384,15 @@ class SLICENODE_BufferShellsMultiple(SliceNode):
 class SLICENODE_Infill(SliceNode):
     bl_label = "Infill"
 
+    infill_type: EnumProperty(
+        name="Infill Type",
+        items=[
+            ('GRID', "Grid", "Cross-hatch grid infill"),
+            ('RECTILINEAR', "Rectilinear", "Alternating parallel lines"),
+        ],
+        default='GRID'
+    ) # pyright: ignore[reportInvalidTypeForm]
+
     def init(self, context):
         self.add_input("SLICESOCK_Paths")
         self.add_input("SLICESOCK_Float", "Density").value = 2.0
@@ -391,6 +400,10 @@ class SLICENODE_Infill(SliceNode):
         self.add_input("SLICESOCK_VectorRotation", "Layer Rotation")
         self.add_output("SLICESOCK_Paths")
 
+    def draw_buttons(self, context, layout):
+        assert layout
+        layout.prop(self, "infill_type", text="")
+
     def evaluate_output(self, socket_name: str, **_kwargs) -> SlicePaths:
         if socket_name != "Paths": return SlicePaths()
 
@@ -410,7 +423,12 @@ class SLICENODE_Infill(SliceNode):
         else:
             p = paths
 
-        res_paths, res_groups = slice.infill_slice(p, density, rotation_deg=infill_rotation)
+        res_paths, res_groups = slice.infill_slice(
+            p, 
+            density, 
+            rotation_deg=infill_rotation,
+            infill_type=self.infill_type # pyright: ignore[reportOptionalMemberAccess]
+        )
 
         if any(rotation):
             # Re-rotate shells back
@@ -426,11 +444,17 @@ class SLICENODE_Infill(SliceNode):
 class SLICENODE_PathsToGcode(SliceNode):
     bl_label = "Paths to Gcode"
 
+    use_header: BoolProperty(name="Header", default=True) # pyright: ignore[reportInvalidTypeForm]
+
     def init(self, context):
         self.add_input("SLICESOCK_Paths")
         self.add_input("SLICESOCK_Intrinsics")
         self.add_output("SLICESOCK_Gcode")
 
+    def draw_buttons(self, context, layout):
+        assert layout
+        layout.prop(self, "use_header")
+
     def evaluate_output(self, socket_name: str, **_kwargs) -> str:
         paths: list[np.ndarray] = resolve_input(self.inputs.get("Paths"))
         intrinsics: SliceIntrinsics | None = resolve_input(self.inputs.get("Intrinsics"))
@@ -444,7 +468,7 @@ class SLICENODE_PathsToGcode(SliceNode):
             pather.feedrate = intrinsics.feedrate
             pather.extrusion_rate = intrinsics.extrusion_rate
 
-        gcode: str = pather.to_gcode()
+        gcode: str = pather.to_gcode(include_header=self.use_header)
         return gcode
 
 @register_class
@@ -924,9 +948,6 @@ class SLICENODE_GcodeToMesh(ExecSliceNode):
             new_e = params.get('E', last_e)
 
             if cmd == 'G1':
-                is_extruding = new_e > 0
-                
-                if is_extruding:
                 # Subtract offsets (scaled to Blender units) to return to original space
                 ox, oy = offset_x * 0.001, offset_y * 0.001
                 segments.append((

core/slice.py

@@ -1,6 +1,4 @@
 from __future__ import annotations
-from typing import Any
-from numpy import ndarray
 import numpy as np
 import pyclipper
 
@@ -324,8 +322,8 @@ def buffer_slice(slice_paths: list[np.ndarray], distance: float, miter='round',
     return paths_list, groups_list
 
 @ndarray_lru_cache(maxsize=32)
-def infill_slice(slice_paths: 'SlicePaths', density: float, rotation_deg: float = 0.0) -> tuple[list[np.ndarray], list[int]]:
-    """Generates a grid infill clipped by the provided paths. Consistent across layers."""
+def infill_slice(slice_paths: 'SlicePaths', density: float, rotation_deg: float = 0.0, infill_type: str = 'GRID') -> tuple[list[np.ndarray], list[int]]:
+    """Generates a grid or rectilinear infill clipped by the provided paths. Consistent across layers."""
     if not slice_paths or density <= 0: return [], []
     
     rotation = np.radians(rotation_deg)
@@ -358,21 +356,19 @@ def infill_slice(slice_paths: 'SlicePaths', density: float, rotation_deg: float
     rg_min_y -= density
     rg_max_y += density
 
-    scaled_grid_paths = []
-    
-    # Vertical lines
+    vertical_lines = []
     x = rg_min_x
     while x <= rg_max_x:
-        scaled_grid_paths.append([
+        vertical_lines.append([
             (int(x * SCALE), int(rg_min_y * SCALE)),
             (int(x * SCALE), int(rg_max_y * SCALE))
         ])
         x += density
 
-    # Horizontal lines
+    horizontal_lines = []
     y = rg_min_y
     while y <= rg_max_y:
-        scaled_grid_paths.append([
+        horizontal_lines.append([
             (int(rg_min_x * SCALE), int(y * SCALE)),
             (int(rg_max_x * SCALE), int(y * SCALE))
         ])
@@ -392,7 +388,19 @@ def infill_slice(slice_paths: 'SlicePaths', density: float, rotation_deg: float
     output_paths: list[np.ndarray] = []
     output_groups: list[int] = []
 
+    # Sort groups by Z to determine layer index for alternating rectilinear infill
+    unique_groups = sorted(groups.keys())
+    group_to_layer_index = {g: i for i, g in enumerate(unique_groups)}
+
     for g in groups.keys():
+        layer_idx = group_to_layer_index[g]
+        
+        if infill_type == 'GRID':
+            current_grid_paths = vertical_lines + horizontal_lines
+        elif infill_type == 'RECTILINEAR':
+            current_grid_paths = vertical_lines if layer_idx % 2 == 0 else horizontal_lines
+        else:
+            current_grid_paths = []
 
         layer_paths = groups[g]
         z = layer_paths[0][0, 2]
@@ -412,8 +420,8 @@ def infill_slice(slice_paths: 'SlicePaths', density: float, rotation_deg: float
             scaled = (path_pts * SCALE).astype(np.int64).tolist()
             pc.AddPath(scaled, pyclipper.PT_CLIP, True) # pyright: ignore[reportAttributeAccessIssue]
             
-        if scaled_grid_paths:
-            pc.AddPaths(scaled_grid_paths, pyclipper.PT_SUBJECT, False) # pyright: ignore[reportAttributeAccessIssue]
+        if current_grid_paths:
+            pc.AddPaths(current_grid_paths, pyclipper.PT_SUBJECT, False) # pyright: ignore[reportAttributeAccessIssue]
             
         solution = pc.Execute2(pyclipper.CT_INTERSECTION, pyclipper.PFT_EVENODD, pyclipper.PFT_EVENODD) # pyright: ignore[reportAttributeAccessIssue]
         clipped_lines = pyclipper.OpenPathsFromPolyTree(solution)  # pyright: ignore[reportAttributeAccessIssue]
@@ -446,7 +454,7 @@ class Pather(object):
         self.feedrate: float = 1200.
         self.extrusion_rate: float = 0.017
 
-    def to_gcode(self) -> str:
+    def to_gcode(self, include_header: bool = True) -> str:
         if not self.paths:
             return ""
 
@@ -473,7 +481,10 @@ class Pather(object):
             dz = p2[2] - p1[2]
             return (dx * dx + dy * dy + dz * dz) ** 0.5
 
-        gcode: list[str] = [
+        gcode: list[str] = []
+
+        if include_header:
+            header: list[str] = [
                 "; Generated from NodeSlicer",
                 f";TYPE:Custom",
                 f";FEEDRATE={self.feedrate}",
@@ -485,6 +496,7 @@ class Pather(object):
                 "M83 ; relative extrusion mode",
                 "G92 E0",
             ]
+            gcode += header
 
         last_z = -1.0
         max_z = 0
@@ -503,15 +515,27 @@ class Pather(object):
                 last_z = z0
 
             gcode.append(f"G0 X{x0:.3f} Y{y0:.3f} Z{z0:.3f}")
-            gcode.append(";TYPE:External perimeter")
 
+            fr = self.feedrate
+            old_fr = 0
             for p1, p2 in zip(coords, coords[1:]):
                 seg_len: float = segment_length_3d(p1, p2)
                 e_segment = seg_len * self.extrusion_rate
+
+                old_x, old_y, old_z = p1
                 x, y, z = p2
-                gcode.append(
-                    f"G1 X{x:.3f} Y{y:.3f} Z{z:.3f} E{e_segment:.5f} F{self.feedrate}"
-                )
+
+                cur_gcode = "G1"
+
+                if not old_x == x: cur_gcode += f" X{x:.3f}"
+                if not old_y == y: cur_gcode += f" Y{y:.3f}"
+                if not old_z == z: cur_gcode += f" Z{z:.3f}"
+                if e_segment: cur_gcode += f" E{e_segment:.5f}"
+                if not old_fr == fr: cur_gcode += f" F{fr:.3f}"
+
+                gcode += [cur_gcode]
+
                 max_z = max(max_z, z)
+                old_fr = fr
             
         return "\n".join(gcode)

doc/MODULES.md

@@ -32,7 +32,7 @@ This file provides a mapping of modules to their primary responsibilities and ke
     - `segments_to_slice()`: Utility to convert raw intersection segments into closed loops using Pyclipper.
     - `link_segments()`: Logic for joining loose segments into continuous paths.
     - `buffer_slice()`: Offset utility using PyclipperOffset. Supports rotated offsetting.
-    - `infill_slice()`: Generates rotated grid infill patterns, ensuring layer-to-layer consistency.
+    - `infill_slice()`: Generates rotated grid or rectilinear infill patterns, ensuring layer-to-layer consistency.
     - `boolean_slice()`: Performs 2D boolean operations (Union, Intersection, etc.) on slice sets.
 
 - `geometry.py`:

doc/NODES.md

@@ -53,7 +53,11 @@ All nodes are found in the **Add (Shift+A)** menu under the **SliceNodes** categ
 - **Get Paths**: Extracts existing edges from a mesh as paths.
 - **Slice Shells**: Slices a `SlicingObject` into 2D `SlicePaths` at a given layer height.
 - **Buffer Shells**: Offsets/buffers 2D `SlicePaths`. Supports rotated offsetting and multiple miter types.
-- **Infill**: Generates a cross-hatch grid of lines clipped by boundary paths. Supports rotation in degrees.
+- **Infill**: Generates a cross-hatch grid or parallel lines clipped by boundary paths. 
+    - **Infill Type**: Switch between **Grid** (cross-hatch) and **Rectilinear** (alternating parallel lines).
+    - **Density**: Distance between lines in units.
+    - **Infill Rotation**: Base rotation of the infill pattern.
+    - **Layer Rotation**: Rotation of the entire slice to align infill with specific planes.
 - **Boolean Paths**: Performs 2D boolean operations (`UNION`, `INTERSECTION`, `DIFFERENCE`, `XOR`) on multiple slice sets.
 
 ### Utility & Joiners
@@ -64,6 +68,7 @@ All nodes are found in the **Add (Shift+A)** menu under the **SliceNodes** categ
 
 ### Action & I/O
 - **Paths to Gcode**: Converts `SlicePaths` into G-code blocks.
+    - **Header**: Toggles the generation of standard NodeSlicer G-code headers and units setup.
 - **Load Gcode**: Reads a G-code file from disk.
 - **Gcode to File**: Writes G-code string to a file on disk.
 - **Gcode to Mesh**: Decodes G-code and creates a Blender mesh ("Debug" object) for visualization. 

infra/blender_mesh_capture.py

@@ -287,9 +287,6 @@ class TriMesh():
         self.length_tris = t
         self.matrix_world = m
 
-from ..core.geometry import ndarray_lru_cache
-
-@ndarray_lru_cache(maxsize=32)
 def _cached_objects_to_tris(obj_names: tuple[str, ...], matrices: tuple[tuple[float, ...], ...], scale: float) -> NDArray[float64]:
     # Implementation remains largely the same but uses names to fetch objects
     tris_count: int = 0
@@ -361,9 +358,6 @@ def objects_to_tris(objects: list[Object], scale) -> NDArray[float64]:
     matrices = tuple(tuple(val for row in o.matrix_world for val in row) for o in objects)
     return _cached_objects_to_tris(obj_names, matrices, scale)
 
-from functools import lru_cache
-
-@lru_cache(maxsize=64)
 def _cached_capture_mesh_edges(
     obj_name: str, 
     mesh_name: str,