Build System for Game Creator 2

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Runtime building and placement for Game Creator 2. Build System for Game Creator 2 connects GC2 Inventory Items to a modular runtime construction workflow with ghost previews, surface/grid/socket placement, editing, dismantling/refunds, save/load, streaming, optional NavMesh support, and extensive Visual Scripting integration.

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Start here

If you are setting up the asset for the first time, open Quick Start & Core Setup. A working build flow has five pieces: a BuildPlacementSettings asset, an Inventory Item with a prefab, a prefab with BuildPart, a builder with a GC2 Bag + BuildTool, and Visual Scripting controls for Start/Confirm/Rotate/Cancel.

Module coverage at a glance

Category	Count	What it covers
Instructions	25	Placement, switching, confirm/cancel, rotation, aim modes, edit/destroy, storage/streaming, NavMesh rebuilds, and runtime debug controls.
Conditions	25	Placement/edit/destroy state, validity and invalid reasons, socket state/range/connections, last results, tags, and completed-action checks.
Events / Triggers	22	Placement lifecycle, valid/invalid transitions, socket candidate/attachment changes, edit selection, destroy lifecycle, blocking-object changes, and error-message hooks.
Properties	27	Current placement/socket data, hit point/normal, current and last Build Parts, last socket actions, invalid reasons/messages, aim mode, and Build Part Tag display name.
Total Visual Scripting entries	99	User-facing GC2 Visual Scripting nodes exposed by the module. Internal helper/base classes are not included.
Runtime Components	5	`BuildTool`, `BuildPart`, `BuildSocket`, `BuildPlacedInstance`, and `BuildStructureSave`.
Setup Asset Types	2	`BuildPlacementSettings` and `BuildPartTag` ScriptableObject assets.
Main Editor Utilities	3	Validation Window, preplaced-instance registration, and placed Item-ID remapping.

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Visual Scripting total: 99 nodes. The counts above are based on the exposed GC2 classes in the uploaded module and exclude internal shared/helper types such as the storage-instruction common base and event base class.

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Documentation guides

Quick Start & Core Setup — installation-side requirements, first setup, Inventory Item/prefab wiring, builder setup, and first placement test.
Build Parts, Sockets & Placement Rules — placement policies, surface/grid rules, support tags, socket compatibility, facing, rotation policies, and multi-socket requirements.
Editing, Dismantling, Save Load, Streaming & NavMesh — edit/destroy workflows, refunds, BuildStructureSave, preplaced pieces, chunks/zones, distance streaming, and optional NavMesh roles.
Visual Scripting Reference & Example Workflows — instructions, events, conditions, properties, and practical GC2 graph patterns.
Validation, Debugging & Troubleshooting — validator, runtime diagnostics, socket/placement failures, persistence problems, Item-ID migration, and Unity 6+ notes.

What the module does

The Build System uses GC2 Inventory Items as the source of buildable objects. The selected Runtime Item is resolved from the builder's Bag, its Item prefab becomes the ghost/final build object, and a successful confirmation consumes one inventory unit. Runtime placements are given BuildPlacedInstance identity so the system can edit, dismantle, save, stream, and restore them.

Placement

Three aim modes: Pointer, Camera Center, and Forward From Builder.
Explicit Build Part placement policies: Surface Only, Socket Only, and Prefer Socket Then Surface.
Optional per-part grid snapping, surface-normal alignment, rotation overrides, socket-search overrides, support-tag rules, and duplicate-placement prevention.
Structured live invalid reasons plus readable invalid messages for UI/debugging.