From 9c144a746555deddfc740c390c99294788993fda Mon Sep 17 00:00:00 2001
From: Nicolas Predella <nicolas@predella.me>
Date: Wed, 3 Jun 2026 19:56:06 +0300
Subject: [PATCH] separate by range

---
 core/nodeslicer/nodes/mesh.py | 90 ++++++++++++++++++++++++++++++++++-
 core/nodeslicer/tree.py       |  1 +
 2 files changed, 90 insertions(+), 1 deletion(-)

diff --git a/core/nodeslicer/nodes/mesh.py b/core/nodeslicer/nodes/mesh.py
index 8e78d38..46d630e 100644
--- a/core/nodeslicer/nodes/mesh.py
+++ b/core/nodeslicer/nodes/mesh.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 from typing import Any
 import numpy as np
 
-from ..bpy_ns_types import NfBoolProperty, NfEnumProperty, notify_tree_changed
+from ..bpy_ns_types import NfBoolProperty, NfEnumProperty, NfIntProperty, notify_tree_changed
 from ....registry import register_class
 from .base import SliceNode, SlicingCollection, get_all_children, SliceNodeJoiner, SlicingGroup, SlicingObject
 
@@ -157,3 +157,91 @@ class SLICENODE_SeparateMesh(SliceNode):
         if socket_name == "Selection":
             return res_selection
         return res_inverted
+
+@register_class
+class SLICENODE_SeparateMeshByRange(SliceNode):
+    bl_label = "Separate Mesh by Range"
+
+    start_val: NfIntProperty(name="Start", default=0, update=notify_tree_changed) # pyright: ignore[reportInvalidTypeForm]
+    end_val: NfIntProperty(name="End", default=1, update=notify_tree_changed) # pyright: ignore[reportInvalidTypeForm]
+
+    def init(self, context):
+        self.add_input("SLICESOCK_Mesh")
+        self.add_input("SLICESOCK_String", "Attribute")
+        self._update_outputs()
+
+    def update(self):
+        super().update()
+        self._update_outputs()
+
+    def _update_outputs(self):
+        # Ensure end >= start
+        start = self.start_val
+        end = max(start, self.end_val)
+        expected_ids = [str(i) for i in range(start, end + 1)]
+
+        # Remove outputs that are no longer in the range
+        # We use a list to avoid modification-during-iteration issues
+        to_remove = [o for o in self.outputs if o.identifier not in expected_ids]
+        for o in to_remove:
+            self.outputs.remove(o)
+
+        # Add new outputs
+        for id_str in expected_ids:
+            if id_str not in self.outputs:
+                self.add_output("SLICESOCK_Mesh", id_str, identifier=id_str)
+        
+        # Re-order to match range
+        for i, id_str in enumerate(expected_ids):
+            current_index = self.outputs.find(id_str)
+            if current_index != -1 and current_index != i:
+                self.outputs.move(current_index, i)
+
+    def draw_buttons(self, context, layout):
+        col = layout.column(align=True)
+        col.prop(self, "start_val")
+        col.prop(self, "end_val")
+
+    def evaluate_output(self, socket_name: str, **_kwargs) -> SlicingCollection | None:
+        coll: SlicingCollection | None = self.resolve("Mesh")
+        attr_name: str = self.resolve("Attribute")
+
+        if not coll: return None
+
+        # Check if we can parse the socket name as an integer
+        try:
+            target_val = int(socket_name)
+        except ValueError:
+            return None
+
+        res = SlicingCollection([], f"{coll.name}_{target_val}")
+
+        for so in coll.objects:
+            if attr_name not in so.attributes:
+                continue
+            
+            attr = so.attributes[attr_name]
+            vals = attr["values"]
+            
+            # Attribute values might be floats or ints, we check for equality
+            mask = vals == target_val
+            
+            if np.all(mask):
+                res.objects.append(so)
+            elif np.any(mask):
+                # Split the object
+                so_new = SlicingObject()
+                so_new.name = f"{so.name}_{target_val}"
+                so_new.parent = so.parent
+                so_new.object_type = so.object_type
+                so_new.extruder = so.extruder
+                so_new.mesh = so.mesh[mask]
+                for k, v in so.attributes.items():
+                    so_new.attributes[k] = {
+                        "domain": v["domain"],
+                        "type": v["type"],
+                        "values": v["values"][mask]
+                    }
+                res.objects.append(so_new)
+
+        return res
diff --git a/core/nodeslicer/tree.py b/core/nodeslicer/tree.py
index 8131bea..95d176f 100644
--- a/core/nodeslicer/tree.py
+++ b/core/nodeslicer/tree.py
@@ -497,6 +497,7 @@ class SLICENODE_MT_Geometry(Menu):
         assert layout
         layout.operator("node.add_node", text="Get Mesh").type = "SLICENODE_GetMesh"
         layout.operator("node.add_node", text="Separate Mesh").type = "SLICENODE_SeparateMesh"
+        layout.operator("node.add_node", text="Separate Mesh by Range").type = "SLICENODE_SeparateMeshByRange"
         layout.operator("node.add_node", text="Get Paths").type = "SLICENODE_GetPaths"
         layout.separator()
         layout.operator("node.add_node", text="Slice Shells").type = "SLICENODE_SliceShells"