Mesh Processing Algorithms

Repair, combine and optimize triangle meshes

MeshLib covers the whole life of a triangle mesh: repair what the scanner or the export broke, combine and compare parts, then simplify and offset the result for printing, machining or visualization. One SDK for C++, Python, C# and C.

See the algorithms Try MeshLib

Repair and clean meshes

Repair mesh defects before any other operation.

Mesh Healing

Mesh healing repairs holes and topology defects to prepare a mesh for the rest of the 3D pipeline: simulation, printing and analysis.

Discover more

Fill Holes

Hole filling corrects topological defects: missing regions where a continuous surface is expected.

Discover more

Mesh Smoothing

Smoothing algorithms reposition vertices to reduce noise and improve surface quality.

Discover more

Combine and compare meshes

Boolean operations, exact common volumes and collision checks between models.

Mesh Boolean

Union, intersection and difference of two 3D objects, used to reshape their geometry.

Discover more

Mesh Intersection

Mesh intersection computes the exact common volume shared by two polygonal models.

Discover more

Collision Detection

Collision detection determines whether two or more objects intersect.

Discover more

Simplify and reshape meshes

Reduce triangle counts and control wall thickness without losing the shape.

Mesh Simplification

Mesh simplification, also called decimation, reduces the number of triangles in a 3D model.

Discover more

Mesh Offsetting

Mesh offsetting expands or contracts a mesh surface by a set distance, for example to control wall thickness for 3D printing.

Discover more

Mesh boolean in Python and C++

Every mesh algorithm follows the same pattern: load, call one function, save. The same API is available in C# and C.

from meshlib import mrmeshpy as mm

a = mm.loadMesh("part_a.stl")
b = mm.loadMesh("part_b.stl")
result = mm.boolean(a, b, mm.BooleanOperation.Union)
if result.valid():
    mm.saveMesh(result.mesh, "union.stl")

// error handling of load and save omitted for brevity
auto a = MR::MeshLoad::fromAnySupportedFormat( "part_a.stl" );
auto b = MR::MeshLoad::fromAnySupportedFormat( "part_b.stl" );
auto result = MR::boolean( *a, *b, MR::BooleanOperation::Union );
if ( result.valid() )
    MR::MeshSave::toAnySupportedFormat( result.mesh, "union.stl" );

Beyond triangle meshes

Try MeshLib now

Booleans, mesh repair, decimation and ICP — in your browser, as JavaScript and WebAssembly. No install, no sign-up.

Open live demo

Or install the SDK — free to evaluate

PythonC++C#CJavaScript

Setup guide · binaries or CMakeSetup guide · binaries, MeshLibC2

Documentation · Licensing · Talk to us

Mesh processing FAQ

What is mesh processing?

Mesh processing is the set of algorithms that repair, combine, simplify and reshape polygonal 3D models: mesh healing and hole filling, boolean operations, intersection and collision checks, decimation and offsetting.

Which programming languages does MeshLib support?

MeshLib is written in C++ and has bindings for Python, C# and C. It also runs in the browser through JavaScript and WebAssembly.

Can MeshLib repair a broken mesh before a boolean operation?

Yes. Run mesh healing and hole filling first, then the boolean. Our article on mesh repair for boolean operations walks through it.

Can I try MeshLib without installing it?

Yes. The MeshLib live demo runs in the browser with no registration and covers booleans, mesh repair, decimation and more.

Cookie	Duration	Description
meshlib_cookie_consent	1 year	Stores your cookie consent choice for this site (policy version, timestamp and categories).
doxygen_* (local storage or cookie)	Session to 10 years	Documentation pages only: remember the position, width and state of the navigation sidebar. Set by the documentation generator and never sent anywhere.
prefers-dark-mode-in-light-mode, prefers-light-mode-in-dark-mode (local storage)	Persistent	Documentation pages only: remember the theme you picked with the light and dark switch.

Cookie	Duration	Description
_ga	2 years	Google Analytics: registers a unique ID used to generate statistical data on how you use the website.
_ga_*	2 years	Google Analytics 4: persists session state for the property.
_clck	1 year	Microsoft Clarity: persists the Clarity user ID and preferences, unique to this site.
_clsk	1 day	Microsoft Clarity: connects multiple page views by a user into a single session recording.
CLID	1 year	Microsoft Clarity (clarity.ms): identifies the first time Clarity saw this user on any site using Clarity.
MUID	13 months	Microsoft (bing.com, clarity.ms): identifies unique web browsers visiting Microsoft sites; used for advertising, site analytics and operational purposes.
ANONCHK	10 minutes	Microsoft Clarity (clarity.ms): indicates whether MUID is transferred to ANID; Clarity does not use ANID, so this is always 0.
MR	7 days	Microsoft (bing.com, clarity.ms): indicates whether to refresh MUID.
SM	Session	Microsoft Clarity (clarity.ms): used in synchronizing MUID across Microsoft domains.
mp_51875322b58ddf1523d499cc7d1c80a2_mixpanel	1 year	Mixpanel: stores the anonymous distinct ID and super properties used for product analytics events.
hubspotutk	6 months	HubSpot: keeps track of a visitor's identity; passed to HubSpot on form submissions and used when deduplicating contacts.
__hstc	6 months	HubSpot: main cookie for tracking visitors; contains the domain, initial and last visit timestamps and the session count.
__hssc	30 minutes	HubSpot: keeps track of sessions to determine whether the session number should be incremented.
__hssrc	Session	HubSpot: set whenever the session cookie changes, to determine whether the visitor has restarted their browser.
__cf_bm	30 minutes	Cloudflare, on behalf of HubSpot (hubspot.com, hs-scripts.com, hs-analytics.net, hs-banner.com): bot management, telling people from automated traffic.
SRM_B	13 months	Microsoft (bing.com): browser identifier paired with MUID, set during Microsoft Clarity's cross-domain sync.
__mpq_51875322b58ddf1523d499cc7d1c80a2_ev (local storage)	Persistent	Mixpanel: queue of analytics events waiting to be sent.

Cookie	Duration	Description
_fbp	90 days	Meta Pixel: first-party browser identifier used to attribute and measure Facebook and Instagram ads.
_fbc	90 days	Meta Pixel: stores the click identifier (fbclid) from a Meta ad that led to this site.
fr	90 days	Meta (facebook.com): used to deliver, measure and improve the relevance of ads.
_gcl_au	90 days	Google Ads: conversion linker; stores ad-click information for conversion attribution.
_gcl_aw	90 days	Google Ads: stores the Google Ads click identifier (gclid) for conversion attribution.
_gcl_dc	90 days	Google Ads: stores the DoubleClick click identifier (dclid) for conversion attribution.
IDE	13 months	Google DoubleClick (doubleclick.net): used for ad delivery, measurement and retargeting.
test_cookie	15 minutes	Google DoubleClick (doubleclick.net): checks whether the browser supports cookies.
NID	6 months	Google (google.com): contains a unique ID used by Google to remember preferences and for ad personalization.
bcookie	1 year	LinkedIn (linkedin.com): browser identifier cookie to uniquely identify devices accessing LinkedIn and detect abuse.
bscookie	1 year	LinkedIn (linkedin.com): remembers that a logged-in LinkedIn member is verified by two-factor authentication.
lidc	24 hours	LinkedIn (linkedin.com): facilitates data center selection.
li_gc	6 months	LinkedIn (linkedin.com): stores guests' consent regarding the use of cookies for non-essential purposes.
li_sugr	90 days	LinkedIn (linkedin.com): used to make a probabilistic match of a user's identity.
li_fat_id	30 days	LinkedIn: member indirect identifier used for conversion tracking, retargeting and analytics.
UserMatchHistory	30 days	LinkedIn (linkedin.com): used for the ID sync process; stores the last sync time to avoid repeating it.
AnalyticsSyncHistory	30 days	LinkedIn (linkedin.com): stores the time a sync took place with the lms_analytics cookie.
ln_or	1 day	LinkedIn: determines whether Oribi analytics can be carried out on this domain.
apolloAnonId (local storage)	Persistent	Apollo website tracker: anonymous visitor identifier and event queue kept in browser local storage, not in a cookie.
__cf_bm	30 minutes	Cloudflare, on behalf of LinkedIn, Apollo.io and HubSpot Ads (linkedin.com, apollo.io, hsadspixel.net): bot management, telling people from automated traffic.
68c4578a29a1ad0011d47ef7_eventQueue, 68c4578a29a1ad0011d47ef7_canTrack (local storage)	Persistent	Apollo.io: queue of visitor events waiting to be sent, and whether tracking is allowed.
lastExternalReferrer, lastExternalReferrerTime (local storage)	Persistent	Meta Pixel: the last external site that referred you here and when, used for ad attribution.