v1.2.5 Strange artifacts #2561

justmyopinion opened this Issue Jan 18, 2015 · 4 comments


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Some strange artifacts at the limits of this model

And specific strange layout of layer at 1mm:

STL file:


alexrj commented Jan 18, 2015

The artifacts in the first screenshot are just rendering errors, don't trust them. They are acute angles not being mitered.

The artifact in the second one is an issue of the Clipper library. I'll investigate it. Same thing as #2416

@alexrj alexrj modified the milestone: 1.2.6, 1.2.7 Jan 18, 2015
alexrj commented Jan 30, 2015

Well, the reason for the artifact is that the original STL file has a little spike and that's being propagated in the offsets:

schermata 2015-01-30 alle 16 30 00

So it's theoretically correct. But the result is not visually nice and gives the user a feeling that Slic3r is misbehaving, so I'll check whether this is fixable without slowing things down.

@alexrj alexrj added a commit that referenced this issue Jan 30, 2015
@alexrj Remove artifacts in original slices so that they're not amplified whi…
…le generating perimeters. #2561 #2416
alexrj commented Jan 30, 2015

Okay, I added a call to the Douglas-Peucker simplification algorithm before generating perimeters. Small performance penalty, sadly.

@alexrj alexrj closed this Jan 30, 2015
@alexrj alexrj removed the Upstream issue label Jan 30, 2015
@alexrj alexrj modified the milestone: 1.2.6, 1.2.7 Jan 30, 2015

It would be very nice if this could get fixed. Even with a speed penalty it is nicer to see a clean image. At the moment it just looks like the program is playing up.

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