added facility to perform translational extrusion of structured meshes

[SamMallinson]

minor change to code for geometry.py. Fixes #83.

[nschloe]

I'd be awesome to get a simple test for that, too, so I don't accidentally mess it up in the future. For this, you basically only need one file in test/examples/ with a generate() function that returns the geometry and the expected area/volume of the mesh.

[nschloe]

Oh, and you can silence the pylint error too-many-branches in .pylintrc.

[SamMallinson]

Hi Nico,
I've added an example called bend.py in test/examples. This creates a bend.geo file which is then converted into a mesh using gmsh. See the file bend.README for details of the commands.
Cheers,
Sam

[SamMallinson]

Oh, and you can silence the pylint error too-many-branches in .pylintrc.

I tried adding the line too-many-branches to .pylintrc, but it still comes back with the error:

~/src/pygmsh$ pylint pygmsh
************* Module pygmsh.geometry
R:309, 4: Too many branches (13/12) (too-many-branches)

---

Your code has been rated at 9.99/10 (previous run: 9.99/10, +0.00)

Am I doing something wrong?

[nschloe]

Adding it to .pylintrc should do it. You could push your changes so I can see what's going wrong.

Alternatively, you could add the comment

# pylint: disable=too-many-branches

to where there are "too many branches" to only disable the warning locally.

[MacZel]

what is the current status for this issue, is it planned to be resolved in the near future?

[SamMallinson]

Sorry for delay, have added disabling command as per Nico's suggestion of Aug 16, pylint now runs fine. Changes committed and pushed.

[MacZel]

Thanks, the change is essential for my master thesis :)
For now I'm using local build

[gdmcbain]

I wrote an example, SamMallinson#1, simpler than the ‘malfunctioning bend’ retracted in f200657. It's based on test/test_screw.py, but without the rotation.

It demonstates the proposed layers keyword argument for the .extrude method.

It currently writes .msh rather than .vtu, as I don't have VTK installed. (Quite difficult for Python 3.6, and I don't need it for anything else.) Feel free to change back to vtu.

The original example wrote a .geo file in order to specify Surface Recombine and Mesh.RecombineAll, which are needed to get quadrilaterals on the primary surface and hexahedra through the volume. These are the most obvious application of the new functionality but not strictly needed; the current example just makes tetrahedra (in one layer). (Actually, I wasn't sure how to specify those options without writing a .geo file, which none of the other examples do.)

[gdmcbain]

Oops, didn't realize that numpy was only needed in the rotational part of test/test_screw.py; deleted unneeded import in SamMallinson#2

[nschloe]

The diff of this PR is huge. Not sure what went wrong exactly, but it might be better just moving the changes to a new, clean branch.

[gdmcbain]

Sorry, I think it's mostly merging things from nschloe/master added since 10 July, looking at

master...gdmcbain:translationalExtrude

but I'll start afresh to make it easier to assess.

[nschloe]

Closing in favor of PR #109.