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Spike artefacts in svg and pdf export


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Hi, I made a complex design and as I wanted to export it as an svg I noticed some really weird spike artefacts at very specific points. I narrowed it down to a specific culprit that you can see in the photo. On the left is what it looks like in designer on the canvas, on the right is what it looks like in the export context menu and also in the finished export. It is a shape made with the V2 shape builder tool. Does anybody know why this is happening? Did I do something wrong or is it a bug in the software? I may need to redo it to fix it, because I do not see a solution, no export setting changed anything (except rasterise, but we do not want that), and I can not see the artefacts within the affinity designer canvas.

Screenshot 2023-04-24 at 10.18.36.png

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Hi @KuffDSchmull and welcome to the forums,

Could you upload your Affinity Designer file so we can take a look...

Affinity Designer 2.3.1.2217 | Affinity Photo 2.3.1.2217 | Affinity Publisher 2.3.1.2217
Affinity Designer Beta 2.4.0.2294 | Affinity Photo Beta 2.4.0.2294 | Affinity Publisher Beta 2.4.0.2294

Affinity Designer 1.7.3 | Affinity Photo 1.7.3 | Affinity Publisher 1.10.8
MacBook Pro 16GB, macOS Monterey 12.6.8

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I wonder if the strokes mitre point is set really high and or he node handles are acute set as well.

iMac 27" 2019 Somona 14.3.1, iMac 27" Affinity Designer, Photo & Publisher V1 & V2, Adobe, Inkscape, Vectorstyler, Blender, C4D, Sketchup + more... XP-Pen Artist-22E, - iPad Pro 12.9  B| (Please refrain from licking the screen while using this forum)

Affinity Help - Affinity Desktop Tutorials - Feedback - FAQ - most asked questions

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5 hours ago, KuffDSchmull said:

Does anybody know why this is happening?

I am thinking that there are coincident nodes, or nodes that are very close together. Switch to the node tool and zoom way in to the "base" of one of the spikes.

Mac Pro (Late 2013) Mac OS 12.7.2 
Affinity Designer 2.3.1 | Affinity Photo 2.3.1 | Affinity Publisher 2.3.1 | Beta versions as they appear.

I have never mastered color management, period, so I cannot help with that.

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3 hours ago, GarryP said:

The shape seems a bit ‘odd’ to me.
Specifically, where there is a ‘dent’ on the left, the stroke seems to be thicker below the ‘dent’ than it is above, but maybe that's something to do with a brush that has been applied.

No brush applied, it's just a uniform thickness solid line stroke

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3 hours ago, Old Bruce said:

I am thinking that there are coincident nodes, or nodes that are very close together. Switch to the node tool and zoom way in to the "base" of one of the spikes.

I do not know how I would zoom into the spikes if they are not there in Designer, only in the exported file, but I figured it out anyway. There was one single node somewhere in the middle of the shape, not connected to any other node and removing that resolved the issue. Thank you for your help anyway, it's how I found the solution.

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8 hours ago, firstdefence said:

I wonder if the strokes mitre point is set really high and or he node handles are acute set as well.

None of those, another user helped me get to a solution, It was just one isolated node gone rogue, once removed everything was fine.

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