Create and wire PCG graphs in Unreal Engine using the native PCG Python API.
npx skills add https://github.com/kevinpbuckley/VibeUE --skill pcg
Please help me install this Agent Skill. Skill: pcg Source: https://github.com/kevinpbuckley/VibeUE/tree/main/Content/Skills/pcg Command: npx skills add https://github.com/kevinpbuckley/VibeUE --skill pcg
Building Procedural Content Generation graphs in Unreal Engine by hand is slow and error-prone, and the PCG Python API has non-obvious pin labels, protected properties, and save/reload requirements that cause silent failures. This Skill provides verified patterns for creating, wiring, and generating PCG graphs without trial-and-error.
add_edge.set_graph, run generate(force=True), and verify output through ISM instance counts."Volume" pin, Vector-typed voxel_size, protected graph property, and mandatory save-then-reload cycles.Use the pcg skill to create a PCG graph at /Game/PCG that scatters cube meshes with a Surface Sampler and Static Mesh Spawner, then place a PCGVolume and generate.
High-intent search queries and answers about installing and using this skill.
Use unreal.PCGGraphFactory with AssetToolsHelpers.get_asset_tools().create_asset to make the asset, then call graph.add_node_of_type with a settings class like PCGSurfaceSamplerSettings to add nodes. Save with EditorAssetLibrary.save_asset and reload the package to refresh the editor.
Call graph.add_edge(from_node, 'Out', to_node, 'In') after inspecting pin labels via each pin's properties label. Pin names vary by node: Surface Sampler's input is "Surface", the graph input node's output is "In", and the output node's input is "Out".
Common causes are wiring to the wrong pin label (add_edge silently no-ops on mismatches), using Surface Sampler in an empty level with no geometry, or forgetting to reload the package so the component runs a cached old graph. Use Volume Sampler with unbounded=True for empty levels.
Both the PCG and PCGPythonInterop plugins must be enabled in the project's .uproject file. Verify at runtime with hasattr(unreal, 'PCGGraph') before executing any graph code.
Build a PCGMeshSelectorWeightedEntry, set static_mesh on its descriptor, and assign the entry list to mesh_entries on the spawner's mesh_selector_parameters. There is no set_mesh shortcut; materials go on the descriptor's override_materials, not on static_mesh.
UE holds an open file handle on loaded .uasset files until shutdown. Close the asset editor tab first, break subgraph cross-references, save, and run garbage collection; if deletion still fails, restart the editor and delete before the assets reload.
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