Modular kits go wrong at the seams: a wall that is 2 cm short, a corner that doesn't meet its neighbor, a floor that doesn't match the stair above it.

GridForge Pro gives every piece connection points (sockets), snaps pieces together from those points so a long run never drifts, and tells you what is wrong before your level designer finds it.

Build

• 28 generated pieces: walls (plain, doorway, arch, window, T, cross, angled, curved), corners and end caps, floors (plain, opening, L, triangle, round), ceilings (plain, opening, tile), square and round pillars, and stairs (straight, quarter-turn, U-turn, spiral, landing, stepped side wall, sloped rail, spiral wall).
• Picture cards: every piece appears in the Build panel as a thumbnail, colored by category.
• Resize after the fact: change the size of any piece and every copy of that design follows.
• Bring your own meshes: register them, give them sockets, and they work like generated pieces.
• Example Kit: one click adds a finished room and staircase to explore.

Connect

• Snap to Nearest Socket places a piece exactly from the socket positions, never by eye.
• Typed, directional sockets: a floor never snaps to a ceiling, and a wall bottom only meets a floor.
• Expansion zones: mark open ends you want to keep free, and GridForge warns you if something gets built over them.

Check

• Validate Scene checks IDs, scale, grid alignment, sockets, connections, seams where pieces meet, UV maps and texel density.
• Analyze Kit asks whether your kit has the pieces to build an enclosed room, finish a wall run, tile a floor or ceiling, seat walls on floors, add doorways, stack pillars or join two floors with a stair. It reports gaps for the patterns you tick and never claims more.
• Coverage Report shows which designs a scene uses and how many of their sockets connect.
• Built for big kits: tested with kits of thousands of modules.

Export

• FBX per design plus a manifest, with clean smoothing groups and UVs.
• Send to Unreal imports into your open editor, compares what Unreal made with what Blender expected, and shows Verified or Not verified with a report. Import has been verified in Unreal Engine 5.
• Old files upgrade themselves when you open them.

Good to know

• Works in centimeters and never changes your scene units.
• Requires Blender 4.5 LTS or newer. Tested on 4.5 and 5.2.
• Stairs are solid blocks, and a stair side wall must be sized to match its flight.
• Collision (UCX) export is included, with a hull-count check. It has not yet been confirmed in the Unreal Static Mesh editor.
• Unreal Engine is the only engine with a verified import. The FBX and manifest are engine-neutral.
• The full list is in Known Limitations, included with the add-on.

What you get

The add-on ZIP and the manual. Install from Edit > Preferences > Get Extensions > Install from Disk.