batched mesh preview

core/nodeslicer/nodes/preview.py

@@ -15,23 +15,20 @@ class SLICENODE_GcodeToMesh(ExecSliceNode):
 
     def init(self, context):
         self._init_exec()
-        self.add_input("SLICESOCK_Gcode", "Gcode")
         self.add_input("SLICESOCK_String", "Name")
+        self.add_multi_socket_group("SLICESOCK_Gcode", name="Gcode")
 
     def draw_buttons(self, context, layout):
         super().draw_buttons(context, layout)
         layout.prop(self, 'show_e_0')
 
-    def evaluate(self, operator=None):
-        gcode: str = self.resolve("Gcode")
-        mesh_name: str = self.resolve("Name")
-
+    def _process_gcode(self, gcode: str, mesh_name: str, operator=None):
         if not gcode:
             if mesh_name in bpy.data.objects:
                 obj = bpy.data.objects[mesh_name]
                 if obj.type == 'MESH':
                     obj.data.clear_geometry()
-            return 'empty'
+            return
 
         vertices = []
         edges = []
@@ -128,7 +125,7 @@ class SLICENODE_GcodeToMesh(ExecSliceNode):
             last_e = new_e
 
         if not vertices:
-            return 'no segments'
+            return
 
         # Create or find "Debug" mesh object
         if mesh_name in bpy.data.objects:
@@ -179,4 +176,25 @@ class SLICENODE_GcodeToMesh(ExecSliceNode):
                 mod = obj.modifiers.new(name="Preview", type='NODES') # type: ignore
                 mod.node_group = ng
 
+    def evaluate(self, operator=None):
+        gcodes = self.resolve_multi_input("Gcode")
+        base_mesh_name: str = self.resolve("Name")
+
+        if not base_mesh_name:
+            base_mesh_name = "GcodePreview"
+
+        # Filter out empty inputs but keep structure to index properly
+        valid_gcodes = [g for g in gcodes if g]
+
+        if not valid_gcodes:
+            if base_mesh_name in bpy.data.objects:
+                obj = bpy.data.objects[base_mesh_name]
+                if obj.type == 'MESH':
+                    obj.data.clear_geometry()
+            return 'empty'
+
+        for i, gcode in enumerate(valid_gcodes):
+            mesh_name = base_mesh_name if i == 0 else f"{base_mesh_name}_{i+1}"
+            self._process_gcode(gcode, mesh_name, operator)
+
         return 'ok'