ScaleBox — Bounding Box Scale Tool

Optimize your level-building workflow with an advanced box-scale tool for the Unreal Engine editor — the one you never knew you were missing.

Tap R twice. Drag a face. The opposite face stays pinned.

Get it on Fab Buy direct on Gumroad

Unreal Engine 5.5 – 5.8 · Windows editor · editor-only, zero runtime footprint

Features

Face handlesAxis-colored handles on every face of the selection's bounds. Drag one — the opposite face stays pinned, so walls stay planted on floors and flush against corners.

Corner handlesUniform scale from the opposite corner, exact even on rotated multi-selections.

Point-to-snapHold V and point the cursor at any geometry — the dragged face jumps flush to it, at any distance.

Live size readoutSee the selection's dimensions in units while you drag.

Grid snappingRespects the editor's snap settings without disturbing off-grid placement. Ctrl inverts it mid-drag.

Symmetric & mirrorShift scales about the center. Drag deliberately past zero to mirror — sticky, so it never happens by accident.

It's not a modeThe scale tool you already use, with a second gear. No editor mode tab, no tool palette, no learning curve. Full undo, construction scripts re-run on release.

Bonus materialsA fully procedural, zero-texture scaffold / blockout material set ships with the plugin.

Documentation

Install

Fab: add to your library, install to the engine from the Epic Games Launcher, then enable ScaleBox in Edit → Plugins for your project.
Gumroad: unzip the version matching your engine into your project's Plugins/ folder (create it if needed), restart the editor. Prebuilt Win64 binaries included — Blueprint-only projects work.

Activating box mode

Tap R twice: first press is the normal scale gizmo, second press switches it into box mode. R again (or W/E) returns to normal.
Or click the Box Scale toolbar button next to the transform tools (viewport Options dropdown on the legacy toolbar).
Box mode is offered when the selection contains scalable geometry — a lone light keeps the native gizmo.

Box Scale button in the viewport toolbar

Controls

Control	Effect
Drag face handle	Scale along that axis; opposite face pinned
Drag corner handle	Uniform scale from the opposite corner
`Shift` + drag	Symmetric — scale about the box center
`Ctrl` + drag	Invert grid snapping
Hold `V` + drag face	Point-to-snap: face jumps flush to the geometry under your cursor, at any distance; with the cursor in empty space, the face snaps to geometry it passes near
`Esc` during drag	Cancel and restore original transforms
Drag past zero	Mirror the selection (sticky ~25% overshoot; never on BSP)

Settings

Editor Preferences → Plugins → ScaleBox: handle sizes, hit-test padding, handle colors, mirror overshoot threshold, contact-snap distance. Changes apply live.

Known limitations (v1.0)

Perspective viewports only — ortho support is planned.
Rotated multi-selections scale via world-aligned bounds (approximate); single rotated actors are exact.
Actors attached to a non-uniformly scaled parent can land slightly off.
No numeric size entry yet (planned).