RE:solid STL, STEP View & Edit

RE:solid 3D views and edits engineering 3D models on Android. It reads mesh and CAD formats, computes geometry on device, edits the model and saves your work to a file. No cloud, no sign-up, no internet.

📁 FORMATS
• STL — binary and ASCII; edge smoothing: strong, medium or off
• OBJ — with MTL, i.e. materials and colours
• 3MF — part names and colours
• PLY — vertex colours, the 3D scanner format
• STEP / STP, IGES / IGS, BREP — CAD solids [PRO]
• ZIP — models from an archive: one, or all as an assembly
• RE:solid project — the model with the state of your work

✏️ EDIT [PRO]
A separate mode for everything that changes geometry — right on the mesh.
• Wall — move it by an exact distance keeping its thickness, or move a single plane; fillets and chamfers travel with it, and it snaps flush with parallel planes
• Hole — move a round or rectangular hole across its face, change the diameter, remove it, or drill a new through or blind hole
• Flatten — level lettering, logos and other bumps or recesses with a flat face
• Scale, mirror, move and rotate a part or the whole model
• Cut into two halves with a closed cut face
• Undo and redo every edit; save the result as STL, OBJ, 3MF or a project

🔧 MESH REPAIR
Gaps, inside-out bodies and loose shells are marked on the model: fix one defect or all at once. Free.

🔄 CAD CONVERSION [PRO]
STEP, IGES and BREP are read by the built-in OpenCascade kernel, locally: the file is never uploaded. An assembly arrives as a tree of named parts. Saving to STL, OBJ or 3MF makes it a STEP → STL converter on the phone. The first CAD file opens at once, using a trial session.

📏 MEASUREMENTS [PRO]
• Distance between points with vertex snapping, along the normal, per axis (ΔX, ΔY, ΔZ)
• Angle between faces, radius, diameter and centre of a circle from three points
• Wall thickness with one tap
• Measurement history; millimetres or inches

🌡 THICKNESS MAP [PRO]
The whole part's thickness in colour: red is thin, blue is thick. A gradient or a threshold; the thinnest wall is marked with a number on the model. Assembly parts are measured one by one.

✂️ SECTION [PRO]
A cutting plane along X, Y, Z or the view, with a capped cut.

⚖️ WEIGHT AND COST [PRO]
Volume, area and mass for 10 materials: PLA, PETG, ABS, PA12-CF, gold 14K/18K, silver 925, steel, copper, aluminium. Own price per gram. Hidden parts are excluded.

🔩 EXPLODE AND ANIMATION [PRO]
• Automatic explode in assembly order, manual tuning with arrows
• Video (MP4 or WebM) that loops seamlessly
• PNG frame capture without the app interface

📦 PROJECT [PRO]
The model and your work in one file: edits, orientation, colours, hidden parts, section, explode, thickness map, camera, a note and attachments. The original is inside, so a project opens on another device, and a heavy STEP assembly opens in a fraction of a second.

🗂 FILES
A model folder in the app: subfolders, previews, search, format filter. Recent files. Opens from a file manager, messenger, mail or cloud.

👁 VIEWING
Shaded and Rendered modes with materials (gold, silver, chrome, copper, glass, diamond), technical modes — wireframe, X-ray, ghosted [PRO], the parts list with names from the file, dimensions, splitting an STL into solids, orientation.

⭐ RE:SOLID PRO
Free: viewing STL, OBJ, 3MF, PLY and ZIP, the library, Shaded and Rendered, materials, model colour, the parts list, dimensions, STL splitting, orientation, mesh repair, undo and redo.

One-time purchase (no subscription) unlocks: Edit mode — walls, holes, flatten, scale, move, cut; STEP, IGES and BREP conversion; projects; section, measurements and the thickness map; weight and cost; explode and animation recording; technical modes; part colour and material; hiding parts; saving to STL, OBJ, 3MF.

Three trial sessions: each unlocks every Pro tool until you close the app.

Everything is computed on the device, models are never uploaded. Editing is direct, on the mesh. You cannot model from scratch as in CAD.

Recent changes:
• New Edit mode (Pro): everything that changes geometry, apart from viewing
• Walls: move by an exact distance keeping the thickness, snap flush with other planes
• Holes: move, resize, remove, or drill new through and blind holes; rectangular too
• Free mesh repair with a defect inspector
• Flatten a face: level lettering and other bumps or recesses with it
• Undo and redo for every edit, even a cut
• Save menu: share any format in one tap, open the saved file right away
• Stability fixes