Unreal Export

UE-ready FBX. Correct centimeter scale awareness. UCX collision. LOD and socket naming.

When to Use

• Static mesh or skeletal mesh to Unreal
• UCX/UCLX collision export
• LOD chain import
• Socket / pivot setup for gameplay

Pre-Flight

1. asset-optimization PASS
2. lod-pipeline for LOD0–N
3. collision-proxy for UCX meshes
4. Apply scale; pivots at intended UE origin

Scale Note

Unreal is centimeter-based. Common approaches:

• Model in meters in Blender, export FBX with unit conversion / 0.01 awareness per project pipeline
• Or work to project-documented scale and verify with a 100cm reference

Always measure a known edge after import.

FBX Defaults (Static)

Selected Objects
Apply Scalings: FBX All
Forward: -Z Forward
Up: Y Up
Mesh: ON
Smoothing: Face

Naming for UE

Type	Pattern
Static mesh	SM_Name
Skeletal	SK_Name
Skeleton	SKEL_Name
LOD	SM_Name_LOD0 …
Collision	UCX_SM_Name_01
Socket empty	SOCKET_Name

Collision

• Prefer convex UCX pieces over complex mesh colliders
• Multiple UCX meshes supported
• See collision-proxy

Skeletal

• UE mannequin-oriented proportions when required
• Root bone; no leftover Blender deform leftovers
• Export morph targets if needed (shape keys)

Verify in Unreal

• Scale (door ~200cm, character ~180cm)
• Collision wireframe
• LODs auto-detected
• Materials / texture sampling
• Sockets transform

Constraints

MUST DO

• Confirm scale with known-dimension test
• Prefix collision with UCX_
• Validate LODs and materials after import

MUST NOT DO

• Export without collision plan for physics actors
• Mix unit systems undocumented

Reference Guide

Topic	Reference	Load When
Unreal Checklist	references/unreal-checklist.md	When needed
Ucx Naming	references/ucx-naming.md	When needed