Extruded text is not manifold

[sigmasoldi3r]

Hello!

Disclaimer: I have the intuition that this has already been discussed, but I can't find the source, so feel free to close this issue and link to another if that is the case.

What went wrong?

When trying to produce a simple text, extrude it and process it in a 3D printing software, it produces non-manifold solids, leading to a mesh that cannot be sliced:

Code to reproduce:

let text = CSG::<()>::text(&self.text, FONT, 0.028, None);
let text_3d = text.extrude(0.001);
let out = text_3d
    .tessellate()
    .to_trimesh()
    .context("Could not generate text mesh data!")?;

Then, the indices and the vertices are plucked into a simple .obj file.

Note: I'm not taking into account normals, if that matters.

[timschmidt]

This may be related to an issue which snuck into recent releases which is fixed in git, and will be fixed in v0.20. Last release which didn't have the issue I'm thinking of was 0.17.4. Could you test with 0.17.4 or latest git and report back?