Assertion check error in `core.pyx` about triangle

[yuqli]

I have the exact same problem since last night! Have to learn some Cython but still, this error seems to be in the assert lines you quoted.

Since this library is updated three months ago and we both seem to be running into trouble since last night, maybe it's some changes in the Cython library. It could be a cdef int is no longer a Python int. I'm not sure why we need these lines either, though.

[drufat]

These assertions just make sure that assumptions about the number of dimensions of arrays in the C library and the python wrapper are actually correct. Do you think you can provide the contents of the P and S variables in the call

triangle.triangulate({'vertices': P[:,:2], 'segments': S}, "p")

which results in the assertion failure? Or I can extract them from the example you have given once I get back to my desk a little later.

[yuqli]

These assertions just make sure that assumptions about the number of dimensions of arrays in the C library and the python wrapper are actually correct. Do you think you can provide the contents of the P and S variables in the call

triangle.triangulate({'vertices': P[:,:2], 'segments': S}, "p")

which results in the assertion failure? Or I can extract them from the example you have given once I get back to my desk a little later.

Thanks for the prompted reply. If it helps, this is the data I used as inputs to the triangulate function which lead to the exact same error. Is it because my data points are 3D instead of 2D?

Code:

   poly = {'vertices': np.array(newpolypoints), 'segments': np.array(segments)}
    print(poly)
    # print poly
    # -- Triangulate
    t = triangle.triangulate(poly, "p")

Output:

{'vertices': array([[  9.24246154,  -2.02496154,  -8.79692308],
       [  6.71146154,  -4.45896154,  -8.79692308],
       [  2.78446154,  -8.23696154,  -8.79692308],
       [  1.91946154,  -9.06896154,  -8.79692308],
       [-11.00953846,   4.26003846,  -8.79692308],
       [ -3.68553846,  11.30403846,  -8.79692308]]), 'segments': array([[0, 1],
       [1, 2],
       [2, 3],
       [3, 4],
       [4, 5],
       [5, 0]])}
Traceback (most recent call last):
  File "triangulation.py", line 201, in <module>
    main()
  File "triangulation.py", line 195, in main
    res = my_triangulation(face_with_points[0])
  File "triangulation.py", line 146, in my_triangulation
    t = triangle.triangulate(poly, "p")
AttributeError: module 'triangle' has no attribute 'triangulate'

[yuqli]

I revised my code and when inputs are 2D arrays the assertionError no longer occurred. Thanks for the help! It could be a coincidence that @rougier and I have the exact same error at roughly the same time... I'm not sure about her/his exact issue though.

[drufat]

@yuqli
Yes, vertices need to be a 2D array containing the x, y coordinates of each vertex.

[drufat]

@rougier I think this pull request for glumpy should fix the issue with the assertion error.
glumpy/glumpy#216

[rougier]

@drufat Oh nice, many thanks.