Skip to main content

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

Project description

Build Status

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.

Features

  • 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.

Installation

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+https://github.com/robotics/assimp_latest.git git+https://github.com/Toblerity/rtree.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?
print(mesh.is_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
mesh.show()

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.

Project details


Release history Release notifications

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Filename, size & hash SHA256 hash help File type Python version Upload date
trimesh-1.9.17.tar.gz (99.2 kB) Copy SHA256 hash SHA256 Source None

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging AWS AWS Cloud computing DataDog DataDog Monitoring Fastly Fastly CDN SignalFx SignalFx Supporter DigiCert DigiCert EV certificate StatusPage StatusPage Status page