Fix missing edges display

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#10 opened on Sep 29, 2019 0 comments 0 reactions 0 assignees View on GitHub

enhancement good first issue hacktoberfest help wanted

Description

Currently some edges are not displayed as expected (see [Bulebule rim design](https://bulebule.readthedocs.io/en/latest/building.html#rim)).

The edge that separates the two cylinders is not displayed in gray, but it should:

![Screenshot from 2019-09-29 21-13-50](https://user-images.githubusercontent.com/526577/65837990-4c3ac000-e2fe-11e9-9b42-1b1cc5fd70d4.png)

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