Align a 3D scan for Blender

Scans import into Blender tilted and off-centre. You can fix that inside Blender, but the cleanest result is a mesh that arrives already square, so the object rotation stays at zero and your modifiers, mirror and snapping behave.

The trap: object rotation vs mesh orientation

If you rotate a crooked scan by eye in Blender, you set the object's rotation (N panel, Item tab). The vertices are still crooked in object space. Clear the rotation with Alt+R and the tilt comes straight back. To bake a rotation into the mesh, use Ctrl+A → Rotation. That works, but you first have to find the right angles, and that is the hard part.

A clean workflow

Align the scan in AlignScan, recenter (bounding box or centroid), and export Z-up, which is Blender's convention.
Import with File → Import → STL / OBJ / PLY. If your version's importer shows Forward and Up axis options, leave them at the defaults (Z up) for a Z-up export.
Check the N panel: Rotation should read 0, 0, 0 and the mesh should sit centred on the origin.
Set the object origin where you want it: Object → Set Origin → Origin to Geometry (or to the 3D cursor).
Apply scale if you changed it (Ctrl+A → Scale) so modifiers behave.

Why alignment helps once you start cleaning

Mirror modifier uses the object's local axes; a square mesh mirrors across a real plane.
Bisect and Boolean cuts along an axis are exact.
Snapping and measuring against the grid make sense for flat faces.

Skip the manual work: drop your scan into AlignScan. It runs in your browser and the file is never uploaded.

Open the aligner →

Add-ons for the next step

Raw scans usually need hole filling, decimation or retopology. Blender add-ons for these live on Superhive (formerly Blender Market).

Browse mesh add-ons on Superhive →