ModuleNotFoundError: No module named 'triangle'

Hello, today I installed trimesh on a Windows x64 using: conda install -c conda-forge trimesh With: trimesh.__version__ I get: 3.6.20.

I wanted to extrude a shapely polygon using the following: import trimesh my_mesh = trimesh.creation.extrude_polygon(my_poly, 12, transform=None, triangle_args=None) This results in the following error: ModuleNotFoundError: No module named 'triangle'

I thought that with using conda all dependencies would be installed.

The exact location where the error is occuring is:

  File "C:\Anaconda3\envs\my_env\lib\site-packages\trimesh\creation.py", line 187, in extrude_polygon
    polygon, triangle_args=triangle_args, **kwargs)

  File "C:\Anaconda3\envs\my_env\lib\site-packages\trimesh\creation.py", line 435, in triangulate_polygon
    from triangle import triangulate

[mikedh]

Hey, looks like you’re missing the soft dependency triangle, try running: pip install triangle

On Fri, Jul 24, 2020 at 9:33 AM Fernando Gomes [e-mail] wrote:

Hello for all,

Same issue persists here:

import trimesh p = trimesh.path.polygons.random_polygon() trimesh.creation.extrude_polygon(p, 50)

Results in …

ModuleNotFoundError Traceback (most recent call last) <ipython-input-41-bc92864e8bb6> in <module> 1 p = trimesh.path.polygons.random_polygon() ----> 2 trimesh.creation.extrude_polygon(p, 50)

~/miniconda3/envs/pcp-env/lib/python3.7/site-packages/trimesh/creation.py in extrude_polygon(polygon, height, transform, triangle_args, **kwargs) 187 # create a triangulation from the polygon 188 vertices, faces = triangulate_polygon( –> 189 polygon, triangle_args=triangle_args, **kwargs) 190 # extrude that triangulation along Z 191 mesh = extrude_triangulation(vertices=vertices,

~/miniconda3/envs/pcp-env/lib/python3.7/site-packages/trimesh/creation.py in triangulate_polygon(polygon, triangle_args, engine, **kwargs) 455 456 # do the import here for soft requirement –> 457 from triangle import triangulate 458 # set default triangulation arguments if not specified 459 if triangle_args is None:

ModuleNotFoundError: No module named ‘triangle’

I am gonna try manual installation and tell here later

Thanks,

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[mikedh]

Hey, yeah I don’t know how conda handles it, I tested with pip in a venv which also works pretty well. triangle is on conda-forge which may be in your env but if not you would need to install it with conda install -c conda-forge triangle

Though triangle unfortunately was removed from requires for license issues in this pr. The logic if you call trimesh.creation.triangulate_polygon(..., engine='triangle') is still there because it requires opt-in and independently installing triangle.

Defaults were switched to mapbox-earcut: https://pypi.org/project/mapbox-earcut/ which you can get through pip (pip install mapbox-earcut) or conda ( conda install -c conda-forge mapbox_earcut).