Modular Kit Snapping Tool

The Modular Kit Snapping Tool is a real connection model for modular kits in Unreal Engine. Drop typed snap points on any wall, floor, corridor, or prop and pieces lock together face-to-face — at edit time or at runtime — with one Blueprint call.

Version: 1.0.0 | Engine: UE 5.7 | Author: StraySpark

Why this plugin

Hand-placing modular kits is slow and error-prone. Grid snapping helps but doesn't know about doorways, mandatory connections, or which way a piece faces. This plugin gives you:

• Typed snap points that describe where a piece can connect, what it can connect to, and which way it faces outward
• AutoSnapAll that assembles a whole kit in one call — at runtime or in editor utilities
• Rule sets that keep level designers from connecting pieces that shouldn't connect (e.g. a window into a foundation)
• Validation that flags pieces with unconnected mandatory points before you ship

Works at runtime too — drop a SnapConnectionManager into a building or survival game and snap pieces as players place them.

Core Features

• 8 snap point types -- Wall, Floor, Ceiling, Corner, Door, Window, Connector, Custom
• 3 connection rules -- MustConnect, Optional, Blocked
• 6 outward directions -- ±X, ±Y, ±Z, used for face-to-face alignment
• Configurable rule sets -- Grid size, snap distance, angle tolerance, type-compatibility matrix
• AutoSnapAll -- One-call assembly of an entire kit; anchors stay put, the rest snap around them
• Validation -- ValidateStructure flags unconnected MustConnect points
• Viewport visualizer -- Colored dots, direction arrows, snap-radius diamonds, live connection lines
• Custom Details Panel -- Snap counts, validation status, one-click Add Snap Point with full undo/redo
• Blueprint events -- OnConnectionMade, OnConnectionBroken, OnValidationResult
• 5 ready-made rule presets -- Medieval Castle, Modern Office, Sci-Fi Corridor, Fantasy Dungeon, Residential House

Common use cases

• Level designers assembling dungeons, castles, or sci-fi corridors from a kit of meshes
• Survival and building games where players place modular walls and floors at runtime
• Procedural level generators that need a deterministic connection model
• Studios standardizing kit conventions across teams

Documentation overview

• Getting Started -- Install and assemble your first kit in five minutes
• Snap Points -- USnapPointComponent reference: types, rules, directions, compatibility
• Rule Sets -- Configure grid size, snap distance, angle tolerance, and the compatibility matrix
• Auto-Snap -- AutoSnapAll, AutoSnapAllInWorld, anchors, ordering
• Validation -- ValidateStructure, MustConnect, Blueprint events
• Presets -- The 5 included rule presets
• API Reference -- Full class and function reference
• Changelog -- Version history

Requirements

• Unreal Engine 5.7
• C++ project (this is a code plugin with runtime and editor modules)