SurfaceSmoothing introduces NAN vertices

[cdcseacave]

For some meshes the smoothing creates vertices with NAN position.
Windows 10 x64, Visual Studio

Ex mesh:

pmp::SurfaceSmoothing smoother(mesh);
smoother.explicit_smoothing(2, false);

creates 8 NAN vertices:

invalid vertex 3991526 position: -nan(ind) -nan(ind) -nan(ind)
invalid vertex 3991527 position: -nan(ind) -nan(ind) -nan(ind)
invalid vertex 3991532 position: -nan(ind) -nan(ind) -nan(ind)
invalid vertex 3991542 position: -nan(ind) -nan(ind) -nan(ind)
invalid vertex 3991557 position: -nan(ind) -nan(ind) -nan(ind)
invalid vertex 3991559 position: -nan(ind) -nan(ind) -nan(ind)
invalid vertex 3991562 position: -nan(ind) -nan(ind) -nan(ind)
invalid vertex 3991563 position: -nan(ind) -nan(ind) -nan(ind)

[cdcseacave]

I found the cause for this particular ex: some degenerate faces. However PMP does not offer a way to detect and fix such problems.

[dsieger]

Hi,

As you already found out, this is most likely due to degenerate faces in the input mesh. We'll eventually add some way to prevent / detect this in a future version.

Thanks,
Daniel

[dsieger]

Reopen and mark as enhancement