The Case of the Missing Triangles

[neonsnowcat]

I'll start by saying that this is the tool I've been looking for for years!

I've been encountering an issue where, when I export my models (I've tried stl, and obj, both of which seem to have the same issue), there are missing faces. Often, it's not a huge issue, as the holes can be fixed by netfabb or the like, but sometimes, there are too many to fix cleanly. Here's one I've been working on (part of a series of state coasters), that has a lot of missing faces, viewed in Blender:

It seems to happen more when I'm doing stuff with extrusions and boolean operations, but I'm not sure totally if that's the problem.

I'm not ready, at this point, to put together an error case, as there's a lot of complicated stuff going on when this happens, and I'm not really sure if it's a bug or user error. I'm more asking if:

1. Other people have encountered an issue like this?
2. If so, how they've dealt with it?
3. If there are any suggestions for how to debug this more effectively? Is there a function to test if a mesh fully encloses a volume?

[z3dev]

@neonsnowcat @neonsnowcat thanks for the post.

Yes. There’s an issue with the faces when exporting due to some very close to parallel sides. Please see Issue #951

https://github.com/jscad/OpenJSCAD.org/issues/951

There’s a fix already tested and approved, but will take a few days to release.

[neonsnowcat]

@z3dev
That's exciting! Thanks for the update!

[z3dev]

@neonsnowcat Please try the latest version via www.openjscad.xyz

Hopefully, those missing triangles have returned to earth.