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If you look at this picture, I want this to be a perfectly rounded corner between these two nodes. I have no idea how far out I have to extent the node curvature pin.

Picture

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  • What version of Illustrator are you using? Recent CC versions have Rounded Corner widgets.
    – Billy Kerr
    Oct 12 at 18:42
  • Ah sorry, I'm using Affinity Designer, but assumed this pretty essential functionality would be the same. Oct 12 at 20:45
  • Removed AI tag.. different companies have different methodologies, even though theoretically you can often accomplish the same thing using software from either company.
    – Scott
    Oct 12 at 22:14
  • Hmmm . . . if Affinity Designer can't do it, then Inkscape has something similar - a Corner Fillet/Chamfer Path Effect, and Inkscape is free. You could always create it in Inkscape, then export as SVG and import it into Affinity Designer.
    – Billy Kerr
    Oct 12 at 23:01
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The next method is exact and it works in any vector drawing program which allows rounding a single corner:

enter image description here

  1. The starting situation. You want to change line segment AB to a perfectly fitting circular arc which is tangential with both branches and you are not going to draw it by eyeballing, it must be accurate

  2. draw 2 lines on the branches which end to A and B. Have ON all point and geometry snappings which are needed for exact snapping (different in different programs)

  3. Stretch proportionally (in Illustrator hold Shift as you drag the corner) the new lines so that they cross. You can use scaling to do it and some programs force you to set the line width to zero for proportional scaling because they scale the bounding box

  4. Sent to back the new lines. Move with the node tool node A to the crossing (you must have snap at crossings ON or insert at first a new node to the crossing)

  5. Delete the new lines and node B. Apply corner rounding with the wanted radius.

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