Serwus3D - hard-surface modelling for iPad

// Overview

Serwus3D is a 3D modelling app for the iPad, built for the kind of modelling a technical artist does all day: game-ready props, modular kits and parts for 3D printing. Not sculpting and not CAD - clean polygons, edge loops and UVs, made with a Pencil in one hand.

It is free to download and model in without limits; saving and exporting are a one-time purchase. No account, no subscription, no data collected - the models stay on the iPad.

My own product, designed and built solo under the Serwus Studio label, from a web prototype to a native iPad app.

// Key features

// Apple Pencil

Made for the Pencil

Tap, lasso and brush selection with pressure, hover preview before you touch, a pad and a ring under one thumb. Fingers move the camera, the Pencil edits - and a finger, mouse or trackpad works too.

// Model

Hard-surface tools

Extrude, inset, bevel, loop and multi-cut, weld and dissolve as tools you drag, not dialogs you fill in. Ngons, soft selection, snapping to grid and geometry.

// Modifiers

Non-destructive stack

Mirror, subdivision with sharp edges, thickness and array - live, reorderable, applied one at a time when you are ready. Booleans get their own panel with a live preview computed in the background.

// Curves

Draw, then build

Curves drawn on the ground, a wall or the model itself become tubes, lathed solids or faces - the fastest way from a sketch to a shape.

// UV

UVs you can actually do on a tablet

Cut seams with a stroke on the model or in the UV editor, unwrap live as you cut, check stretching on a colour grid, pack islands.

// Retopo

Retopology

Draw, tap and relax a clean quad mesh over a dense scan or sculpt, with the result snapped to its surface.

// Materials

PBR materials

A scene material library with albedo, normal, ORM and emission maps, a PBR material view and textures carried into FBX, GLB, OBJ and USDZ.

// Export

Engine- and print-ready

Check for print finds holes and thin walls. One tap exports for Unity, Unreal or a 3D printer: FBX for engines and animation, STL in millimetres, GLB in metres, OBJ with materials, USDZ for AR.

// Gallery

Serwus3D: the Serwus cube selected, with gizmo, pad and tool rail — Modelling with the Pencil - gizmo, pad and tool rail

Serwus3D: curves drawn with the Pencil, turned into tubes — Curves drawn with the Pencil, turned into tubes

Serwus3D: UV editor beside the model, seams in red — UV editor - seams cut on the model and in the layout

Serwus3D: Materials panel with roughness, metalness and texture maps — Materials - roughness, metalness and PBR maps

Serwus3D: an imported game scene in metres — Imported game scene - OBJ, STL and GLB

// My role

Product and UX - an interface for one hand and a Pencil: every tool reachable with the thumb, a tutorial built like game levels, tested run after run on a real iPad.
Geometry engine - ported from my own web prototype to Swift, algorithm by algorithm, each one checked against golden files the prototype produced. Over 700 automated tests.
Renderer - Metal: PBR shading, edit-mode overlays, UV grid, turntable rendering, all at the iPad's refresh rate.
Pipeline - built, signed and shipped to TestFlight entirely from Windows, with cloud Mac runners - no Mac on the desk.
Icons and brand - the app icon and tool icons drawn by hand, in up to three colour roles.

// Specs

DEVICE

iPad · iPadOS 17+

INPUT

Pencil · touch · mouse · trackpad

OPEN

.serwus · FBX · STL · OBJ · GLB · glTF

EXPORT

FBX · GLB · OBJ + MTL · STL · USDZ · MP4

PRICE

Free to try · one-time unlock

PRIVACY

Data Not Collected

Read the online documentation →

// Tech Stack

SwiftSwiftUI MetalUIKit touch StoreKit 2glTF / GLB GitHub ActionsTestFlight