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Import, export, process, analyze and view triangular meshes.

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Python (2.7-3.*) library for loading and utilizing triangular meshes. The goal of the library is to provide a fully featured Trimesh object which allows for easy manipulation and analysis, in the style of the excellent Polygon object in the Shapely library.


  • Import binary/ASCII STL, Wavefront, and OFF
  • Import formats using assimp (if pyassimp installed)
  • Import STEP files as meshes (if STEPtools Inc. Author Tools installed)
  • Import 2D or 3D vector paths from DXF or SVG files
  • Export meshes as binary STL, COLLADA, or OFF
  • Preview meshes (requires pyglet)
  • Internal caching of computed values which are automatically cleared when vertices or faces are changed
  • Fast loading of binary and ASCII STL files (on 234,230 face mesh, was 24.5x faster than assimp)
  • Calculate face adjacencies quickly (for the same 234,230 face mesh .248 s)
  • Calculate cross sections (.146 s)
  • Split mesh based on face connectivity using networkx (4.96 s) or graph-tool (.584 s)
  • Calculate mass properties, including volume, center of mass, and moment of inertia (.246 s)
  • Find coplanar groups of faces (.454 s)
  • Fix triangle winding to be consistent
  • Fix normals to be oriented ‘outwards’ using ray tests
  • Calculate whether or not a point lies inside a watertight mesh using ray tests
  • Find convex hulls of meshes (.21 s)
  • Compute a rotation/translation/tessellation invariant identifier for meshes (from an FFT of the radius distribution)
  • Merge duplicate meshes from identifier
  • Determine if a mesh is watertight (manifold)
  • Repair single triangle and single quad holes
  • Uniformly sample the surface of a mesh
  • Find ray-mesh intersections
  • Boolean operations on meshes (intersection, union, difference) if OpenSCAD is installed
  • Voxelize watertight meshes
  • Unit conversions
  • Create meshes by extruding 2D profiles
  • Numerous utility functions, such as transforming points, unitizing vectors, grouping rows, etc.


The easiest way to install is:

$ sudo pip install trimesh

Optional Dependencies

Basic functionality is available immediately. Some functions (ray queries, polygon handling, mesh creation, viewer windows, boolean operations, additional importers) require additional libraries:

$ sudo apt-get install cmake openscad libspatialindex*
$ sudo pip install pyglet shapely git+ git+ svg.path meshpy

Quick Start

Here is an example of loading a cube from file and colorizing its faces.

import numpy as np
import trimesh

# load a file by name or from a buffer
mesh = trimesh.load_mesh('./models/featuretype.STL')

# is the current mesh watertight?

# since the mesh is in fact watertight, it means there is a
# volumetric center of mass which we can set as the origin for our mesh
mesh.vertices -= mesh.center_mass

# find groups of coplanar adjacent faces
facets, facets_area = mesh.facets(return_area=True)

# set each facet to a random color
for facet in facets:
    mesh.visual.face_colors[facet] = trimesh.color.random_color()

# preview mesh in an opengl window if you installed pyglet with pip

In the mesh view window, dragging rotates the view, ctl + drag pans, mouse wheel scrolls, ‘z’ returns to the base view, ‘w’ toggles wireframe mode, and ‘c’ toggles backface culling.

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