DOCUMENTATION

Smart Segmentation splits any 3D model into meaningful parts automatically, then

lets you correct the result by hand before you commit.

Everything is in the 3D Viewport sidebar. Press N and open the "Smart Segment" tab.

ANALYZE

Select a mesh and press Analyze Model. The addon measures how thick the model is

at every point and where the surface folds inward, and cuts along those signals

instead of an arbitrary grid. Runs once, takes a few seconds. Everything after

this is instant.

GRANULARITY

Parts   How many parts to cut into. Drag it and the viewport updates live.

Auto    Picks the count where the model naturally wants to divide.

BOUNDARY REFINEMENT

Slides every boundary onto the real crease in the full resolution mesh.

Stiffness   How far a boundary may travel to reach a crease. Lower moves further.

            0.6 default, 0.3 if boundaries refuse to move, 1.5 if they wander.

Band Width  How many face rings around a boundary may move.

Live        Updates as you drag. Switches off above 300,000 faces; the button

            still works.

MERGE BRUSH, LASSO AND BOX

For anything the analysis got wrong.

1. Pick Target Part. Hover to preview, click to lock it in. This is where the

   geometry you paint will go.

2. Choose Brush, Lasso or Box from the dropdown and press the button.

Drag            assign faces to the target

Ctrl + Drag     erase

Shift + Click   pick a different target without leaving the tool

Shift + Wheel   brush size (Brush only)

Ctrl + Z        undo one stroke

Enter           apply       Esc  discard

Only faces facing the camera are affected, so the back of the model is safe.

Brush edits survive changing the part count and re-running refinement.

MANUAL MERGE

For parts that should have been one piece.

Pick & Merge          Click each part, Enter to fuse them, Esc to cancel.

Merge Selected Faces  Select faces in Edit Mode, return to Object Mode, press it.

Merges are remembered by geometry, not by part number, so they survive every

later change.

SPLIT ONE PART ONLY

Adds detail to one part without re-cutting the whole model.

Pick Region To Split, then raise Parts. Every extra cut lands inside that part

and nothing else changes. Apply & Pick Next bakes it in and moves you on to the

next part. Applied splits stack up.

EXPLODE

Blows the parts apart so you can inspect the split from the inside, with a slider

for how far. Press again and everything returns exactly where it was. Works both

before splitting, as a preview, and after, on the real objects.

OUTPUT

Split Into Parts   One object per part, open cuts capped automatically, placed in

                   their own collection.

Bake To Materials  Keeps one object and assigns a distinct material per part.

Auto Refine On Split  Runs refinement before splitting.

Cap Open Cuts         Closes the boundary left on each part.

Min Part Faces        Discards parts smaller than this.

TYPICAL WORKFLOW

Analyze, set Parts, let refinement clean the boundaries, fix leftovers with the

brush or lasso, merge anything that should be one piece, then Split Into Parts.

REQUIREMENTS

Blender 4.2 or newer. No external dependencies.

SUPPORT

Discord: https://discord.gg/EC8d7nPsYj

Milad Kambari - 3DRedbox Studio