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OpenSCAD 2021.01 renders imported 3MF files weirdly due to locale lib3mf bug #4204

Open hroncok opened 2 years ago

hroncok commented 2 years ago

I don't know if this is some problem in our Fedora packaging of lib3mf or openscad, but I'd like to get it fixed and I have no idea how. Note that I cannot reproduce this with Debian/Ubuntu OpenSCAD package, just in Fedora. My openscad and lib3mf are installed from the Fedora repos, I run Fedora 35, x86_64.

openscad-2021.01-4.fc35.x86_64
lib3mf-2.0.1-2.fc35.x86_64

This also happens with lib3mf-2.2.0-1.fc35.x86_64 from my own Fedora pull request, no magic fix happened by upgrading.

Steps to reproduce

  1. Open an OpenSCAD model, e.g. from examples. I used the basic CSG example.
  2. Render and export as 3MF.
  3. In another OpenSCAD file, import the 3MF file, e.g. import("CSG.3mf"); and render/preview it.

Expected result

The render/preview should look like the original model.

Expected result

Actual result

The render/preview looks weird.

Actual result

This looks like a problem with import, rather than export, because the exported 3MF file looks normal in PrusaSlicer.

PrusaSlicer result

I would appreciate any pointers. I've searched 3MF in issues here, but could not find anything. Thanks

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nophead commented 2 years ago

Looks like the points get snapped to a very coarse grid, possibly just integers. Something wrong with text to float conversion.

t-paul commented 2 years ago

Locale issue https://github.com/3MFConsortium/lib3mf/issues/282

There's no full support for lib3mf v2.x at this point, but I'm pretty sure it's not an OpenSCAD issue.

hroncok commented 2 years ago

Oh, the infamous scanf breaks with Qt apps and locales with decimal commas :facepalm:

My Fedora system is Czech and the Ubuntu/Debian system I tested this on is English.

Feel free to close this here, if you are not interested in a workaround.

hroncok commented 2 years ago

The workaround would be to wrap lib3mf library calls with temporary numeric locale reset to C.

t-paul commented 2 years ago

Lets keep it open to monitor what's going on. I'll label it as discussion.

I hope at some point we can fully move to v2.x. so it might be usefull to keep the reference.

t-paul commented 10 months ago

Upstream Patch submitted - https://github.com/3MFConsortium/lib3mf/pull/322.

makeasnek commented 10 months ago

Want to back this issue? Post a bounty on it! We accept bounties via Bountysource.

Please do not use bountysource. Many devs have had trouble getting paid there. You can check out this lemmy community as an alternative https://lemmy.ml/c/bugbounties

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t-paul commented 10 months ago

@makeasnek feel free to post that as a separate issue, it's not really useful having that as comment on some random issue which not even has a bounty. I'll mark both comments as off-topic here.