Pivot point (origin)

The pivot point is the point an object rotates and scales around, and the reference point you move it by. Epic's documentation describes a mesh's pivot as "the point that rotation and scaling use" (Unreal Engine 5.8 Documentation: Edit Pivot Tool in Unreal Engine). Blender calls the same idea the object origin (Blender 4.5 LTS Manual: Object Origin).

#Why it matters

The pivot decides what happens when someone uses your asset. If it is in the wrong place, a level designer cannot snap a wall to the grid, a crate floats or sinks when placed, and a door spins around its middle instead of swinging open.

The pivot does not have to be inside the mesh. Epic notes that "the pivot point can be inside or outside an actor" (Unreal Engine 5.5 Documentation: Transforming Actors in Unreal Engine).

#Where to put it

For characters, one export checklist says to model with the "feet on the floor at the origin" and to apply all transforms before export (Cinevva: Blender to Unreal Engine Export Checklist…). For modular pieces, keep your modeling grid in multiples of the engine's grid, so a pivot on a grid corner snaps cleanly in the engine (Polycount: Way early stages of a project, planning out…).

#Pivots on a production kit

On a large modular kit, pivots stop being a per-asset choice and become a team decision. Joel Burgess, whose Bethesda GDC talks on Skyrim's kits are covered on modular kits, lists "pivot point location, base footprint size, and transition metrics" among the decisions that can be a disaster to change late (80 Level: Building Huge Open Worlds: Modularity, Kits &…): every piece already placed in every level would have to move.

Walls with thickness have no single correct pivot. In a Polycount thread on interior walls, the original poster wanted thickness on both sides of the grid line, like The Sims 4, and found that edge or corner pivots then need separate inset and outset variants of wall furniture (Polycount: Interior wall pivots, center on edge or stick…).

#Common mistakes

• Leaving the pivot at the world origin while the mesh is far away. The asset appears metres away from where it was dropped.
• Unapplied rotation and scale. In Blender, apply rotation and scale (Ctrl+A) so they reset before export (KatsBits Blender Knowledgebase: FBX rotation fix for Unity).
• Inconsistent pivots across a kit. If half the walls have a corner pivot and half a centre pivot, nobody can snap them together.

#In different tools

• Blender calls it the object origin (Blender 4.5 LTS Manual: Object Origin). Transforms are applied with Ctrl+A > Apply, which bakes rotation and scale into the mesh (KatsBits Blender Knowledgebase: FBX rotation fix for Unity; Cinevva: Blender to Unreal Engine Export Checklist…).
• Unreal Engine offers two kinds of pivot change. A temporary one: middle-click the centre of the translation gizmo and drag to move the pivot, then transform around it (Unreal Engine 5.5 Documentation: Transforming Actors in Unreal Engine). A permanent one: the Edit Pivot tool, with presets such as Center, Bottom, Top and World Origin based on the bounding box (Unreal Engine 5.8 Documentation: Edit Pivot Tool in Unreal Engine).
• Unity, Godot and other engines: the safest habit is the same everywhere. Set the pivot in your modeling tool before export, so every engine receives the same asset.

#Related terms

units, scale and axes · modular kits · grids and metrics · the game asset pipeline · collision meshes · 3D file formats

#Further reading and watching