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Break curves on circe to make semicircle

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I have been fiddling with the break and close curve options for about 30 minutes not and i cant figure out how to turn this circle into not a circle.

Frankly, the break curve tool confuses me. I have used it often, and occasionally it will do what i am wanting, and other times it spazes out completely



I can get one side to here but if i try to delete just the right side point i get the second picture



Could i get a detailed explanation of how the break curve tool functions so that i can try to figure out what i am doing wrong

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Hard to tell from the screen shots but it could be coincident nodes.

Mac Pro (Late 2013) Mac OS 11.7.1 
Affinity Designer 2.0.0 | Affinity Photo 2.0.0 | Affinity Publisher 2.0.0 | Beta versions as they appear.

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

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Mac mini M1 A2348

LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5

iPad Air Gen 5 (2022) A2589

Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps.


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The Break Curve will quite simply open a node or selection of nodes.  Because it has to operate on nodes it can't be used on a shape ex. rectangle, ellipse, etc.  If you have an ellipse it must be converted to curves, which will result in 4 nodes.  If one node is selected you will see no difference.  But the curve goes from a closed curve to an open curve.  If two nodes are selected you will end up with 2 curves.  Either a 90 degree arc and a 270 degree arc, or two 180 degree arcs depending on the 2 nodes selected.  These will be open curves that are created.  If they need to be closed curves then you can select the curve and click on the Close Curve right next to the Break Curve.

Of course you can add nodes anywhere they are needed and break the curve on these nodes as well as the 4 original nodes.

That's really all there is to the Break Curve.  I can't tell from your screen shots what you did to get the objects shown in the second and third images.  I've never had it not react as expected.  Maybe you can explain in more detail exactly what you are trying to do and the steps taken when it doesn't work for you.

Also, which Affinity product are you working in?

iMac (27-inch, Late 2009) with macOS Sierra

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