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I'm looking to cut a shape into the surface of a sphere using a 3D curve. I have a curve wrapped onto the sphere. I do not want to knife-project because the shape needs to wrap around the sides in a way that goes past the ortho view Curve bending around a sphere

The task feels intuitive; from the "normal up" direction towards "normal down" I want to project a cut between the curve and the sphere. But I do not know a method for this.

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  • $\begingroup$ Just a workaround ... Curve to Mesh > Extrude > Scale, Sphere - add Solidify and Boolean > Difference (Curve), Visual Geometry to Mesh, Merge by Distance. $\endgroup$
    – vklidu
    Commented Sep 30, 2023 at 13:38
  • $\begingroup$ ... THere is also Intersect Knife, but it expects overlapping faces, that I'm not sure if Curve to Mesh and Shrinkwrap generates. $\endgroup$
    – vklidu
    Commented Sep 30, 2023 at 13:55

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Working from vklidu's idea; just a workaround, but good enough: A ring cut into a sphere

I've converted to mesh, extruded out and in, done a bit of scaling to make it match the "approximate" normal direction, then added a Solidify to the ring, and Boolean differenced it with the sphere (which also has a thickness modifier on it).

At this point, I can apply everything and clean up a bunch. It gets there.

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  • $\begingroup$ You could extrude one direction and scale to center of sphere ... solidify you should use to sphere (not curve) like that you can get single cut in mesh = less cleaning :) $\endgroup$
    – vklidu
    Commented Oct 5, 2023 at 6:58

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