make_instances_real.py

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#
#  This program is free software; you can redistribute it and/or
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#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
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import bpy


class makeInstancesReal(bpy.types.Operator):
    bl_idname = "custom.make_instances_real"
    bl_label = "Seperate And Make Instances Real"
    bl_description = "Seperate And Make Instances Real"

    @classmethod
    def poll(cls, context):
        return context.selected_objects is not None

    def execute(self, context):
    
    # if parent does not have child
        if bpy.context.scene.prefabPLANE == None:
            bpy.context.scene.errorCode = 4
            bpy.ops.custom.error_message('INVOKE_DEFAULT') 
            
        elif len(bpy.context.scene.prefabPLANE.children) < 1:
            bpy.context.scene.errorCode = 4
            bpy.ops.custom.error_message('INVOKE_DEFAULT') 
            
        else:
        
            for selectedOBJ in bpy.data.objects:
                selectedOBJ.select_set(False)

            dupePLANE = bpy.context.scene.prefabPLANE

            prefabCollection = bpy.context.scene.prefabPLANE.users_collection[0]

            dupePLANE.select_set(True)

            bpy.context.view_layer.objects.active = dupePLANE

            bpy.ops.object.duplicates_make_real()

            udkCollection = bpy.data.collections.new('UDK Collection')

            bpy.context.scene.collection.children.link(udkCollection)

            objCollection = bpy.data.collections.new(str(bpy.context.scene.prefabOBJ.users_collection[0].name).rstrip('.123456789'))

            bpy.context.scene.collection.children['UDK Collection'].children.link(objCollection)

            bpy.context.scene.collectionHolder = "{}".format(str(objCollection.name))

            for obj in bpy.context.selected_objects:
                if obj.type != 'MESH':
                    continue

                prefabCollection.objects.unlink(obj)

                objCollection.objects.link(obj)

                obj.name = bpy.context.scene['prefabOBJ'].name

        return {'FINISHED'}