# How to add nodes to event graph via python or other script? **URL:** \ **Category:** Programming & Scripting\ **Tags:** unreal-engine, question\ **Created:** [May 29, 2023, 8:48pm UTC](https://forums.unrealengine.com/t/how-to-add-nodes-to-event-graph-via-python-or-other-script/1182738 "2023-05-29T20:48:13Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Fibulator](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Fibulator](https://forums.unrealengine.com/u/Fibulator)\ **Post date:** [May 29, 2023, 8:48pm UTC](https://forums.unrealengine.com/t/how-to-add-nodes-to-event-graph-via-python-or-other-script/1182738/1 "2023-05-29T20:48:13Z")
What I’m trying to accomplish: I want to create an addon that reads nodes from a Blender Geometry Node group within a .blend file, and then ‘translates’ those nodes into nodes used by Unreal’s Geometry Script. Parts I know how to do: How to create a python script. Parts I need help with: How to read from .Blend file (I’ll search Blender Forums for this) How to create nodes in a Geometry Script Object via another script\<-- This is what I need the most help with. Basically, how do I create a blueprint, add dynamic mesh component, add nodes to event graph, and connect/move nodes? How to create an addon (I vaguely understand this, just drag and drop files into a “plugins” sub-folder created from ‘create new addon’ button) If I have to use different scripting language like C#, let me know. ---
**Author:** ![Fibulator](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Fibulator](https://forums.unrealengine.com/u/Fibulator)\ **Post date:** [May 30, 2023, 6:22pm UTC](https://forums.unrealengine.com/t/how-to-add-nodes-to-event-graph-via-python-or-other-script/1182738/2 "2023-05-30T18:22:49Z")
Update: I’ve managed to get UE to read python scripts. After 6+ hours, I located the command to create a blueprint and save it… after 10 more hours of looking, I can’t find how to add nodes to the event graph, to save my life. It appears I have to do something like .modify() then I’m utterly lost. API documentation is a disaster. -\_- ---
**Author:** ![martianthinker](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@martianthinker](https://forums.unrealengine.com/u/martianthinker)\ **Post date:** [July 16, 2023, 9:32pm UTC](https://forums.unrealengine.com/t/how-to-add-nodes-to-event-graph-via-python-or-other-script/1182738/3 "2023-07-16T21:32:38Z")
Just started looking into this myself. There are references in unreal to EdGraph and EdGraphNode, but nothing is exposed. Would love to be wrong about this. ---
**Author:** ![JesseHumphry](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jessehumphry/32/1215657_2.png) [@JesseHumphry](https://forums.unrealengine.com/u/JesseHumphry)\ **Post date:** [January 29, 2024, 10:00pm UTC](https://forums.unrealengine.com/t/how-to-add-nodes-to-event-graph-via-python-or-other-script/1182738/4 "2024-01-29T22:00:27Z")
From what I can tell, in Python you need to get a Blueprint object, then get the controller for the blueprint. It’s the MVC programming pattern; model, view, controller. The model is the graph itself, the view is the viewport, and the controller is what allows the two to interact. However, I was only able to accomplish this with ControlRig and using control rig’s python log in the messages window. As an example, here’s the code I used in Python after getting the control rig’s Blueprint: ```auto def add_forward_solve(cls, bp_rig: unreal.ControlRigBlueprint): controller = bp_rig.get_controller_by_name('RigVMModel') script_path = '/Script/ControlRig.RigUnit_' # Add the Forward Solve Event node node_name = 'BeginExecution' controller.add_unit_node_from_struct_path(script_struct_path=script_path + node_name, position=unreal.Vector2D(0.0, 0.0), node_name='RigUnit_' + node_name) # Add the for_each node node = unreal.StringLibrary.conv_string_to_name( 'DISPATCH_RigVMDispatch_ArrayIterator(in Array,out Element,out Index,out Count,out Ratio)' ) controller.add_template_node(node, unreal.Vector2D(256.0, 0.0), 'DISPATCH_RigVMDispatch_ArrayIterator') # add the GetAllControls node node_name = 'CollectionGetAll' controller.add_unit_node_from_struct_path(script_struct_path= script_path + node_name, position=unreal.Vector2D(-160.0, 80.0), node_name=node_name) controller.set_pin_default_value(pin_path='CollectionGetAll.TypeToSearch', default_value='Control', resize_arrays=False) controller.add_link('CollectionGetAll.Items', 'DISPATCH_RigVMDispatch_ArrayIterator.Array') # Attach Execution from Forward Solve controller.add_link('RigUnit_BeginExecution.ExecuteContext', 'DISPATCH_RigVMDispatch_ArrayIterator.ExecuteContext') # Get Bone Transform from Element node_name = 'GetTransform' controller.add_unit_node_from_struct_path(script_struct_path= script_path + node_name, position=unreal.Vector2D(512.0, 208.0), node_name=node_name) controller.set_pin_expansion('GetTransform.Item', False) controller.set_pin_default_value('GetTransform.Space', 'GlobalSpace') controller.set_pin_default_value('GetTransform.bInitial', 'False') controller.add_link('DISPATCH_RigVMDispatch_ArrayIterator.Element', 'GetTransform.Item') # Set Bone Transform node = unreal.StringLibrary.conv_string_to_name( 'Set Transform::Execute(in Item,in Space,in bInitial,in Value,in Weight,in bPropagateToChildren)', ) controller.add_template_node(notation=node, position=unreal.Vector2D(869.0, 0.0), node_name='Set Transform') controller.set_pin_expansion('Set Transform.Item', True) controller.set_pin_default_value('Set Transform.Item', '(Type=Bone,Name="None")') controller.set_pin_default_value('Set Transform.Space', 'GlobalSpace') controller.set_pin_default_value('Set Transform.bInitial', 'False') controller.set_pin_default_value('Set Transform.Weight', '1.0') controller.set_pin_default_value('Set Transform.bPropagateToChildren', 'True') controller.add_link('GetTransform.Transform', 'Set Transform.Value') # Add the Name replacement node node = unreal.StringLibrary.conv_string_to_name('Replace::Execute(in Name,in Old,in New,out Result)') controller.add_template_node(notation=node, position=unreal.Vector2D(576.0, 64.0), node_name='Replace') controller.add_link('DISPATCH_RigVMDispatch_ArrayIterator.Element.Name', 'Replace.Name') controller.set_pin_default_value('Replace.Old','CRC_', False) controller.add_link('Replace.Result', 'Set transform.Item.Name') controller.add_link('DISPATCH_RigVMDispatch_ArrayIterator.ExecuteContext', 'Set Transform.ExecuteContext') ``` Figuring out the names and types of nodes to add to the graph is probably going to be very difficult, but as I need this for work, I’ll continue to naturally chase down where these things can be found. ---
**Author:** ![Fibulator](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Fibulator](https://forums.unrealengine.com/u/Fibulator)\ **Post date:** [March 3, 2024, 4:38pm UTC](https://forums.unrealengine.com/t/how-to-add-nodes-to-event-graph-via-python-or-other-script/1182738/5 "2024-03-03T16:38:43Z")
Well, I’m literally creating the nodes myself, so finding the name isn’t hard. 😉 I eventually went the route of creating a plugin that adds all the necessary code to add nodes to blueprints… and turned those into nodes themselves. So, I have a blueprint that makes a new blueprint, and adds a series of nodes to it, and connects them all up. It first reads from a text file that a list of nodes/connections exported from Blender’s Geometry nodes, and re-creates the node tree natively in Unreal’s Geometry Scripting. To find the name of nodes, just r-click a node, click copy, go to a text editor, paste. It’s a string of text, and buried in there is the category and name. 🙂 So, if you want to be able to add nodes to blueprints from within a blueprint, it’s included in my plugin here. > **[Blender Geometry Node to Unreal Geometry Script Translation](https://creaturelover4.gumroad.com/l/woegc)** > > Included in this pack is an extension to the existing Geometry Script feature in Unreal. This adds in several new nodes and functions that mimic some of the nodes seen in Blender's Geometry Nodes.Also included is a rudimentary "export" python script... ---
**Author:** ![Fibulator](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Fibulator](https://forums.unrealengine.com/u/Fibulator)\ **Post date:** [March 3, 2024, 4:41pm UTC](https://forums.unrealengine.com/t/how-to-add-nodes-to-event-graph-via-python-or-other-script/1182738/6 "2024-03-03T16:41:20Z")
Yep. I forget exactly how I did it, but I did some weird stuff to expose those functions. Made some insane progress with the help of ChatGPT. 🙂 ---
**Author:** ![system](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/1/3/713c9d3f58553f0de89543d76a8a3a2779dc9fa4.png) [@system](https://forums.unrealengine.com/u/system)\ **Post date:** [April 2, 2024, 4:41pm UTC](https://forums.unrealengine.com/t/how-to-add-nodes-to-event-graph-via-python-or-other-script/1182738/7 "2024-04-02T16:41:41Z")
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