Command-line geometry preparation

Broken geometry in.
Valid, simulation-ready surfaces out.

Betti prepares geometry for simulation and 3D printing. Meshes as real tools export them, with slivers, cracks, flipped faces, holes, overlapping parts and self-intersections, and CAD models as STEP files go in. Closed, valid surfaces and clean, even triangles or quads that stay true to the original shape come out.

Download Get started

One executable with no dependencies, for Linux, macOS and Windows on x86-64 and ARM. Free for non-commercial use.

What you can count on

Valid output

Results are closed and consistently oriented, without self-intersections, cracks or slivers, ready for a mesher, a solver or a slicer.

True to the shape

Sharp edges, holes and small steps are kept, and the surface stays within a distance of the original that you choose. betti verify measures it.

One executable

A single file with nothing to install beside it. It runs the same on a laptop, a workstation or a cluster node, and fits into scripts.

Real-world files

Built for geometry as it arrives: scans, exports from CAD and design tools, downloads, assemblies of overlapping parts.

For whom

Simulation engineers

  • Repair and remesh surfaces into even triangles or quads for CFD and FEA.
  • Mesh STEP models watertight, every triangle tagged by its CAD face, or heal them CAD to CAD.
  • Mesh touching parts so they conform across their interfaces.
  • Extract mid-surfaces for shell elements and centrelines for beams.
  • Fill solids with particles for SPH, and build sphere clumps and packed beds for DEM.

3D printing

  • Turn downloads and scans into closed, printable solids.
  • Find thin walls before they fail, and turn a part for the least support.
  • Hollow parts to a wall thickness, with drain holes.
  • Cut, combine and simplify parts, and slice them into layers.
  • Write 3MF, OBJ, PLY and more.

Results

Three views of a CAD bracket: as exported with long thin triangles, remeshed into even triangles, and remeshed into quads.
A CAD bracket as exported, with slivers and fans (left), remeshed into even triangles (middle) and into quads (right). Its holes, step and rounded ends are kept within the default distance of the original.
Three views of a bracket: as exported, wrapped in a closed surface, and wrapped keeping its sharp edges.
Any input wrapped in a closed, valid surface: the bracket as exported (left), wrapped at 1% of its size (middle), and wrapped keeping its sharp edges (right, the default).
Three views of a punched plate: as exported, with small holes removed, and with larger holes removed.
Defeaturing a punched plate: as exported (left), with holes up to 10 across removed (middle), and up to 20 (right). Each filled region stays within a chosen distance of the surface it replaces.
A block with a hole meshed into quads two ways: an irregular quad mesh, and a clean grid on every face.
Quads on a block with a hole: paired from triangles (left), and the default (right), a clean grid on every face with irregular vertices only where the shape needs them.
A nut crank, and the same part hollowed and cut open to show its shell.
A nut crank (left), hollowed to a wall of 1 with a drain hole, then cut open to show the shell (right).
A bracket coloured from red where its walls are thin to blue where they are thick.
Wall thickness on the bracket, from red where thin to blue where thick.
A nut crank split into two bodies, meshed so that their triangles meet along the shared interface.
A nut crank cut into two bodies and meshed as an assembly: the bodies share their interface and meet vertex for vertex along the seam.

Quick start

Look at what a file is, repair it, remesh it at 1% of its size, and check the result against the input:

betti info part.stl
betti fix repair part.stl fixed.obj
betti mesh remesh -size 1% fixed.obj even.obj
betti verify part.stl even.obj

Or chain the steps on a mesh kept in memory, and mesh a STEP model watertight:

betti run part.stl out.obj fix repair + mesh remesh -size 1%
betti cad mesh part.step part.3mf

Every command explains itself: betti help lists them, betti fix lists a module's, and betti help fix repair shows a command's flags. The same text is in the docs.

Modules

Commands are grouped by module. Core is free and needs no sign-in; the others are granted on request, free for non-commercial use.

Core Free

Inspect, measure, verify, convert, chain steps.

Fix

Repair, orient, keep the outer shell, denoise, wrap, rebuild.

Mesh

Even triangles or quads, assemblies, mid-surfaces, centrelines.

Shape

Cut, combine, hollow, defeature, split into convex parts.

CAD

STEP in: check, heal, mesh watertight, find primitive surfaces.

Additive manufacturing

Place on the bed, slice into layers, measure wall thickness.

Particles

Particles for SPH, sphere clumps and packed beds for DEM.

The name

Betti is named after Enrico Betti, whose numbers count a shape's pieces, tunnels and voids: what repair has to get right, and what every result is checked to keep.

Betti was called edgewise up to v0.17; v0.18.0 is the first release as Betti.