variable extrusion

core/nodeslicer/bpy_ns_types.py

@@ -1,5 +1,5 @@
 import bpy
-from bpy.props import PointerProperty, StringProperty, FloatProperty, IntProperty, EnumProperty, BoolProperty, CollectionProperty
+from bpy.props import PointerProperty, StringProperty, FloatProperty, IntProperty, EnumProperty, BoolProperty, FloatVectorProperty, CollectionProperty
 
 from . import tree
 
@@ -66,3 +66,4 @@ NfFloatProperty = NfProperty(FloatProperty)
 NfEnumProperty = NfProperty(EnumProperty)
 NfBoolProperty = NfProperty(BoolProperty)
 NfPointerProperty = NfProperty(PointerProperty)
+NfFloatVectorProperty = NfProperty(FloatVectorProperty)

core/nodeslicer/nodes.py

@@ -345,17 +345,24 @@ class SLICENODE_GetMesh(SliceNode):
 class SLICENODE_GetPaths(SliceNode):
     bl_label = "Get Paths"
 
+    attr_name: NfStringProperty(name="Extrusion Multiplier", default="e_mult") # pyright: ignore[reportInvalidTypeForm]
+
     def init(self, context):
         self.add_input("SLICESOCK_Object")
         self.add_output("SLICESOCK_Paths")
 
+    def draw_buttons(self, context, layout):
+        assert layout
+        layout.prop(self, "attr_name")
+
     def evaluate_output(self, socket_name: str, **_kwargs) -> SlicePaths:
         obj: Any = self.resolve("Object")
+        attr_name: str = self.attr_name
 
         from ...infra.blender.blender_mesh_capture import capture_mesh_edges
-        so: list[np.ndarray] = capture_mesh_edges(obj)
+        so, e_rates = capture_mesh_edges(obj, attr_name=attr_name)
 
-        return SlicePaths(so)
+        return SlicePaths(so, extrusion_rate=e_rates)
 
 @register_class
 class SLICENODE_SliceShells(SliceNode):
@@ -1569,11 +1576,21 @@ class SLICENODE_GcodeToMesh(ExecSliceNode):
                     obj.data.clear_geometry()
             return 'empty'
 
-        segments = []
+        vertices = []
+        edges = []
+        e_rates = []
+        
         last_x, last_y, last_z = 0.0, 0.0, 0.0
         last_e = 0.0
         
         offset_x, offset_y = 0.0, 0.0
+        default_extrusion_rate = 0.017 # Default fallback
+
+        last_v_idx = -1
+        last_p2 = None
+
+        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
 
         for line in gcode.splitlines():
             # Parse metadata from comments
@@ -1585,6 +1602,9 @@ class SLICENODE_GcodeToMesh(ExecSliceNode):
                 elif comment.startswith("OFFSET_Y="):
                     try: offset_y = float(comment.split('=')[1])
                     except ValueError: pass
+                elif comment.startswith("DEFAULT_EXTRUSION_RATE="):
+                    try: default_extrusion_rate = float(comment.split('=')[1])
+                    except ValueError: pass
 
             line_no_comment = line.split(';')[0].strip()
             if not line_no_comment: continue
@@ -1615,15 +1635,41 @@ class SLICENODE_GcodeToMesh(ExecSliceNode):
             if show:
                 # Subtract offsets (scaled to Blender units) to return to original space
                 ox, oy = offset_x * 0.001, offset_y * 0.001
-                segments.append((
+                p1 = (last_x - ox, last_y - oy, last_z)
-                    (last_x - ox, last_y - oy, last_z), 
+                p2 = (new_x - ox, new_y - oy, new_z)
-                    (new_x - ox, new_y - oy, new_z)
+                
-                ))
+                # Calculate e_rate (proportion between E and default_extrusion_rate)
+                seg_len_mm = segment_length_3d(p1, p2) * 1000.0
+                if seg_len_mm > 0 and default_extrusion_rate > 0:
+                    e_rate = (new_e / seg_len_mm) / default_extrusion_rate
+                else:
+                    e_rate = 1.0
+
+                if last_v_idx != -1 and p1 == last_p2:
+                    # Connect to previous segment
+                    v2_idx = len(vertices)
+                    vertices.append(p2)
+                    edges.append((last_v_idx, v2_idx))
+                    last_v_idx = v2_idx
+                else:
+                    # Start new path
+                    v1_idx = len(vertices)
+                    v2_idx = v1_idx + 1
+                    vertices.extend([p1, p2])
+                    edges.append((v1_idx, v2_idx))
+                    last_v_idx = v2_idx
+                
+                e_rates.append(e_rate)
+                last_p2 = p2
+            else:
+                # Break path connection on travel or non-shown move
+                last_v_idx = -1
+                last_p2 = None
 
             last_x, last_y, last_z = new_x, new_y, new_z
             last_e = new_e
 
-        if not segments:
+        if not vertices:
             return 'no segments'
 
         # Create or find "Debug" mesh object
@@ -1637,13 +1683,15 @@ class SLICENODE_GcodeToMesh(ExecSliceNode):
             assert bpy.context.collection
             bpy.context.collection.objects.link(obj)
 
-        vertices = []
-        edges = []
-        for i, (p1, p2) in enumerate(segments):
-            vertices.extend([p1, p2])
-            edges.append((2*i, 2*i + 1))
-
         mesh.from_pydata(vertices, edges, [])
+
+        # Create e_mult attribute on edges
+        if "e_mult" not in mesh.attributes:
+            mesh.attributes.new(name="e_mult", type='FLOAT', domain='EDGE')
+        
+        e_mult_attr = mesh.attributes["e_mult"]
+        e_mult_attr.data.foreach_set("value", e_rates)
+
         mesh.update()
 
         # Assign Geometry Nodes nodegroup for preview

core/nodeslicer/sockets.py

@@ -3,7 +3,7 @@ from typing import Any
 import bpy
 from bpy.props import CollectionProperty
 from bpy.types import Property, PropertyGroup, bpy_struct
-from .bpy_ns_types import NfStringProperty, NfFloatProperty, NfIntProperty, NfEnumProperty, NfPointerProperty
+from .bpy_ns_types import NfStringProperty, NfFloatProperty, NfIntProperty, NfEnumProperty, NfPointerProperty, NfFloatVectorProperty
 
 from ...registry import register_class
 from ...infra.blender.blender_slice_nodes_generic import SliceNodeSocket
@@ -99,7 +99,7 @@ class SLICESOCK_DirPath(InputNodeSocket):
 class SLICESOCK_VectorRotation_Common(InputNodeSocket):
     bl_label = "VectorRotation"
 
-    value: bpy.props.FloatVectorProperty(name="Vector", size=3, default=(0.0, 0.0, 0.0), subtype='EULER') # pyright: ignore[reportInvalidTypeForm]
+    value: NfFloatVectorProperty(name="Vector", size=3, default=(0.0, 0.0, 0.0), subtype='EULER') # pyright: ignore[reportInvalidTypeForm]
     bl_color = (166/255, 99/255, 199/255, 1.0)
     
 @register_class
@@ -111,7 +111,7 @@ class SLICESOCK_VectorRotationRo(ReadonlySocket, SLICESOCK_VectorRotation_Common
 class SLICESOCK_Vector_Common(InputNodeSocket):
     bl_label = "Vector"
 
-    value: bpy.props.FloatVectorProperty(name="Vector", size=3, default=(0.0, 0.0, 0.0)) # pyright: ignore[reportInvalidTypeForm]
+    value: NfFloatVectorProperty(name="Vector", size=3, default=(0.0, 0.0, 0.0)) # pyright: ignore[reportInvalidTypeForm]
     bl_color = (0.39, 0.39, 0.78, 1.0)
 
 @register_class

core/slice.py

@@ -10,20 +10,32 @@ SCALE = 1_000_000
 
 class SlicePaths(list[np.ndarray]):
     groups: list[int]
+    extrusion_rate: list[np.ndarray]
 
-    def __init__(self, paths: list[np.ndarray] = [], groups: list[int] = []):
+    def __init__(self, paths: list[np.ndarray] = [], groups: list[int] = [], extrusion_rate: list[np.ndarray] | None = None):
         super().__init__(paths)
         
         self.groups = []
         if groups: self.groups = list(groups)
         else: self.groups = list(range(0,len(paths)))
 
-    def copy_with(self, paths: list[np.ndarray], groups: list[int] | None = None) -> SlicePaths:
+        self.extrusion_rate = []
+        if extrusion_rate: 
+            self.extrusion_rate = list(extrusion_rate)
+        else:
+            self.extrusion_rate = [np.ones(len(p)) for p in paths]
+    
+    def copy_with(self, paths: list[np.ndarray], groups: list[int] | None = None, extrusion_rate: list[np.ndarray] | None = None) -> SlicePaths:
         """Returns a new SlicePaths object with new paths/groups but preserving all other metadata."""
-        new_obj = SlicePaths(paths, groups if groups is not None else self.groups)
+        if extrusion_rate is None:
+            # Only reuse extrusion_rate if path lengths match exactly
+            if len(paths) == len(self) and all(len(p) == len(op) for p, op in zip(paths, self)):
+                extrusion_rate = self.extrusion_rate
+        
+        new_obj = SlicePaths(paths, groups if groups is not None else self.groups, extrusion_rate)
         # Copy any other attributes that might have been added
         for k, v in self.__dict__.items():
-            if k != "groups":
+            if k not in ["groups", "extrusion_rate"]:
                 setattr(new_obj, k, v)
         return new_obj
 
@@ -44,12 +56,7 @@ class SlicePaths(list[np.ndarray]):
             p = self.transform(np.array(mat))
 
         res_paths, res_groups = buffer_slice(p, distance, miter=miter)
-        new_paths = SlicePaths(res_paths, res_groups)
+        new_paths = self.copy_with(res_paths, res_groups)
-        
-        # Copy other metadata from self
-        for k, v in self.__dict__.items():
-            if k != "groups":
-                setattr(new_paths, k, v)
 
         if rotation and any(rotation):
             from mathutils import Euler
@@ -67,12 +74,7 @@ class SlicePaths(list[np.ndarray]):
             p = self.transform(np.array(mat))
 
         res_paths, res_groups = infill_slice(p, density, rotation_deg=rotation_deg, infill_type=infill_type)
-        new_paths = SlicePaths(res_paths, res_groups)
+        new_paths = self.copy_with(res_paths, res_groups)
-
-        # Copy other metadata from self
-        for k, v in self.__dict__.items():
-            if k != "groups":
-                setattr(new_paths, k, v)
 
         if layer_rotation and any(layer_rotation):
             from mathutils import Euler
@@ -519,6 +521,7 @@ class Pather(object):
 
     def __init__(self, paths: list[np.ndarray], **kwargs) -> None:
         self.paths = paths
+        self.extrusion_rates = getattr(paths, "extrusion_rate", [np.ones(len(p)) for p in paths])
         self.bed_center_x: float = 250.
         self.bed_center_y: float = 250.
         self.feedrate: float = 1200.
@@ -557,8 +560,8 @@ class Pather(object):
             header: list[str] = [
                 "; Generated from NodeSlicer",
                 f";TYPE:Custom",
-                f";FEEDRATE={self.feedrate}",
+                f";DEFAULT_FEEDRATE={self.feedrate}",
-                f";EXTRUSION_RATE={self.extrusion_rate}",
+                f";DEFAULT_EXTRUSION_RATE={self.extrusion_rate}",
                 f";OFFSET_X={offset_x:.6f}",
                 f";OFFSET_Y={offset_y:.6f}",
                 "G21 ; set units to mm",
@@ -571,11 +574,13 @@ class Pather(object):
         last_z = -1.0
         max_z = 0
 
-        for line in centered_paths:
+        for i, line in enumerate(centered_paths):
             coords = line.tolist()
             if len(coords) < 2:
                 continue
 
+            e_rates = self.extrusion_rates[i]
+
             x0, y0, z0 = coords[0]
 
             if abs(z0 - last_z) > 0.001:
@@ -589,9 +594,9 @@ class Pather(object):
 
             fr = self.feedrate
             old_fr = 0
-            for p1, p2 in zip(coords, coords[1:]):
+            for j, (p1, p2) in enumerate(zip(coords, coords[1:])):
                 seg_len: float = segment_length_3d(p1, p2)
-                e_segment = seg_len * self.extrusion_rate
+                e_segment = seg_len * self.extrusion_rate * e_rates[j]
 
                 old_x, old_y, old_z = p1
                 x, y, z = p2

infra/blender/blender_mesh_capture.py

@@ -409,11 +409,12 @@ def _cached_capture_mesh_edges(
     obj_name: str, 
     mesh_name: str, 
     matrix_tuple: tuple[float, ...], 
-    scene_scale: float
+    scene_scale: float,
-) -> list[NDArray[float64]]:
+    attr_name: str = "e_mult"
+) -> tuple[list[NDArray[float64]], list[NDArray[float64]]]:
     # This helper expects that the object and mesh exist and are accessible via bpy.data
     obj = bpy.data.objects.get(obj_name)
-    if not obj: return []
+    if not obj: return [], []
 
     # We don't use obj_eval here directly as it's not hashable, 
     # but we assume this is called when we know we need to re-capture.
@@ -423,10 +424,10 @@ def _cached_capture_mesh_edges(
         obj_eval = obj.evaluated_get(depsgraph)
         mesh = obj_eval.to_mesh(preserve_all_data_layers=True, depsgraph=depsgraph)
     except Exception:
-        return []
+        return [], []
 
     if not mesh or not mesh.vertices: 
-        return []
+        return [], []
 
     try:
         world_mat = np.array(matrix_tuple).reshape(4, 4)
@@ -434,6 +435,10 @@ def _cached_capture_mesh_edges(
         verts = np.empty((num_verts, 3), dtype=np.float64)
         mesh.vertices.foreach_get("co", verts.ravel())
 
+        e_mults = np.ones(num_verts, dtype=np.float64)
+        if attr_name in mesh.attributes:
+            mesh.attributes[attr_name].data.foreach_get("value", e_mults)
+
         tx_verts = (verts @ world_mat[:3, :3].T + world_mat[:3, 3]) * scene_scale
 
         edges_set = {tuple(sorted(e.vertices)) for e in mesh.edges}
@@ -441,25 +446,30 @@ def _cached_capture_mesh_edges(
 
         split_at = np.where(~connected)[0] + 1
         raw_paths = np.split(tx_verts, split_at)
+        raw_e_mults = np.split(e_mults, split_at)
         indices_split = np.split(np.arange(num_verts), split_at)
 
         final_paths = []
+        final_e_mults = []
         for i, path_coords in enumerate(raw_paths):
             if path_coords.shape[0] == 0:
                 continue
             idx = indices_split[i]
+            e_vals = raw_e_mults[i]
             if len(idx) > 2 and tuple(sorted((idx[0], idx[-1]))) in edges_set:
                 path_coords = np.vstack((path_coords, path_coords[0]))
+                e_vals = np.concatenate((e_vals, [e_vals[0]]))
             final_paths.append(path_coords)
+            final_e_mults.append(e_vals)
 
-        return final_paths
+        return final_paths, final_e_mults
 
     finally:
         if hasattr(obj_eval, "to_mesh_clear"):
             obj_eval.to_mesh_clear()
 
-def capture_mesh_edges(obj: Object) -> list[NDArray[float64]]:
+def capture_mesh_edges(obj: Object, attr_name: str = "e_mult") -> tuple[list[NDArray[float64]], list[NDArray[float64]]]:
-    if not obj or not obj.data: return []
+    if not obj or not obj.data: return [], []
 
     if obj.mode == 'EDIT':
         obj.update_from_editmode()
@@ -474,5 +484,6 @@ def capture_mesh_edges(obj: Object) -> list[NDArray[float64]]:
         obj.name, 
         obj.data.name, 
         matrix_tuple, 
-        scene_scale
+        scene_scale,
+        attr_name
     )