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[Affinity Designer] Subtract operation leaves behind outline inside a curve


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Hello,

I was trying to subtract the red part in the attached image out of the white part. I was expecting it to create a "hole" inside the white part but instead it created an outline and I have no idea what to do next. I'm still new to the program so maybe this is a normal thing but if anybody knows how to do the said operation I would be very appreciated!

Here's what it looks like before subtraction:

image.png.990207e6d0fc89a980f8cff43e81532a.png

 

Here's what is looks like afterwards:

image.png.9d10012d1c84bb8c50c808ec4176ea54.png

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Is the document set to have a transparent background -- is File > Document Setup > Color tab > "Transparent background" ticked? If not then the white part may just be the document background showing through, not part of the curve.

Either way, it would help if you showed the entire curve & the Layers panel, or better yet attach a sample AD document showing the curves.

All 3 1.10.8, & all 3 V23.0 Mac apps; 2020 iMac 27"; 3.8GHz i7, Radeon Pro 5700, 32GB RAM; macOS 10.15.7
Affinity Photo 
1.10.8; Affinity Designer 1.108; & all 3 V2 apps for iPad; 6th Generation iPad 32 GB; Apple Pencil; iPadOS 15.7

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Subtract the top red curve from the white S-shaped one & then with the while curve still selected in the Layers menu change the Fill Mode to Alternate (Even-Odd).

If you want to keep the lower red shape visible, move it above the while curve layer. Sample File Fill mode fix.afdesign includes the history so you can step back & see how this works.

All 3 1.10.8, & all 3 V23.0 Mac apps; 2020 iMac 27"; 3.8GHz i7, Radeon Pro 5700, 32GB RAM; macOS 10.15.7
Affinity Photo 
1.10.8; Affinity Designer 1.108; & all 3 V2 apps for iPad; 6th Generation iPad 32 GB; Apple Pencil; iPadOS 15.7

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