# PCG graph viewer & AI explainer for Unreal Engine > GraphDeck opens PCG graphs outside Unreal: one click in the editor (free Connector plugin) sends the graph to GraphDeck, rendered with Unreal's exact node colors, point-data blue wires, attribute orange, and expandable advanced-pin sections. Explain & Ask lessons - powered by the AI you already use - trace the pipeline sampler to spawner with pulses riding the real wires. Ctrl+C copies a received PCG graph back out as native paste data. AI generation for PCG is coming in a later update. When a PCG graph misbehaves, the answer is often three nodes upstream. Open yours in GraphDeck and ask the AI you already use what the pipeline actually does - where density gets decided, why the spawner starves - explained with pulses riding your real wires. Understand it, then fix it. [Download GraphDeck Free for Windows](https://downloads.graphdeck.app/pro) - New in GraphDeck 0.7 · Receive from Unreal · Copy back out · Every wire preserved · AI generation coming in a later update ## How it works ### 1. Send it over One click in the Unreal editor (free Connector plugin) sends a PCG graph to GraphDeck - and every wire survives, including several outputs feeding the same input. ### 2. It reads like the PCG editor Samplers, filters, transforms, and spawners in their editor colors, point-data wires in UE's blue and attribute wires in orange, with advanced-pin sections that expand when you need them and stay collapsed when you don't. ### 3. Ask what the pipeline does Right-click and ask. A lesson can trace the data path sampler to spawner with pulses riding your actual wires, note where density is decided, and explain why a filter starves the spawner - drawn on the real nodes by the AI you already use. ### 4. Edit it and copy it back Ctrl+C on a received PCG graph produces text that pastes cleanly back into the Unreal editor - including your edits. ## Use AI to understand Unreal rather than avoid understanding it PCG graphs look simple until they are not: density decided three nodes upstream, a Difference node silently emptying a point set, a filter that starves the spawner. GraphDeck's Explain & Ask lessons - powered by the AI you connect, not an AI of GraphDeck's own - answer on the canvas: notes anchored to the actual nodes and pulses riding the real wires, sampler to spawner, in data order. Every mark is validated against the live graph before it draws. If the AI names a node that does not exist, the lesson is refused - your graph is always the ground truth. ## What you get - **The full PCG node library.** Samplers, filters, transforms, spawners, boolean ops, metadata and attribute nodes - resolved against a library built from the real editor. - **Every wire preserved.** Receiving keeps the whole graph intact - including multiple outputs feeding one input - and received graphs that work in Unreal stay green in GraphDeck. - **Rich per-node settings.** Density values, filter thresholds, transform ranges, mesh entries - node settings ride along on receive, so the graph you read matches the graph that runs. - **Copy back out.** Edit the pipeline on the canvas and Ctrl+C produces native paste data for the Unreal editor - round-trip editing without touching your project until you choose to. ## FAQ ### Can I open a PCG graph outside Unreal? Yes. With the free Connector plugin, one click in the Unreal editor sends a PCG graph to GraphDeck, every wire intact - including several outputs feeding the same input. ### Can AI explain my PCG graph? Yes. GraphDeck turns the AI you already use into a teacher on the canvas: stepped lessons, notes anchored to your actual nodes, and pulses that trace the data path sampler to spawner. GraphDeck has no AI of its own - it works with the AI you connect, with or without an API key. ### Can AI generate PCG graphs? AI generation for PCG is coming in a later update. Today's tools cover receiving, reading, editing, validating, and understanding the PCG graphs you already have. ### Can I edit it and send it back? Yes. Edit on the canvas, then Ctrl+C on a received PCG graph produces native paste data that lands cleanly back in the Unreal editor - including your changes. ### Is this in the free edition? Yes. Receiving, editing, validation, and Explain & Ask lessons all ship in Free. Free keeps 5 saved graphs in each tool; buying GraphDeck removes the caps. ## Download The free edition receives, edits, validates, and explains PCG graphs with no API key and no subscription. Pair it with the free Connector plugin for one-click send from Unreal. [Download GraphDeck Free](https://downloads.graphdeck.app/pro) · [Pricing](https://graphdeck.app/pricing) --- Unreal Engine is a trademark of Epic Games, Inc. GraphDeck is not affiliated with or endorsed by Epic Games. © 2026 GraphDeck · Operated by Adam Broder --- [Home](https://graphdeck.app/) · [Connector](https://graphdeck.app/connector) · [Docs](https://graphdeck.app/docs/) · [FAQ](https://graphdeck.app/faq) · [Pricing](https://graphdeck.app/pricing) · Contact: hello@graphdeck.co.uk