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Since a UV sphere has poles, the best way to make a "perfect" sphere is subdividing a cube and casting it to a sphere, so there is no pinching. You can make a hemisphere by deleting the bottom half.

However, the vertices don't go around it in flat rings, so I can't use this method to make, say, a top third of a sphere.

Is there a better way to make a third of a sphere without a pole at the top?

JackHainsworth
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    Related:https://blender.stackexchange.com/questions/70810/how-to-avoid-the-wrinkle-at-the-poles-of-the-uv-sphere/70811#70811 – josh sanfelici Sep 09 '20 at 12:18

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You can instead just use the boolean modifier in order to cut away the quad sphere. It should still keep all-quad geometry but the faces near the cut could be squished.

Important notes:

  • Using subdivision surface on a cube will not give you a perfect sphere. The corners will always be slightly lopsided.
  • Instead: Enable the "Extra Objects- Mesh" addon inside Edit->Preferences->Addons. This comes with Blender. Then, when you add a new object you can choose "Round Cube" inside the mesh section. Choose that, and switch the operator preset to "quadsphere" to make a truly round quadsphere.
Eric Xue
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    I used a cast modifier after the subsurf, which gives a perfect sphere. I've stopped using subsurf in my actual models, instead just using higher vert counts. It makes modelling with exact measurements a lot easier.

    I ended up doing this, using a boolean. I was worried edge sliding the verts which effected the edge bevel would make it not smooth, but it didn't affect it at all.

     – JackHainsworth Sep 09 '20 at 17:09
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Yes use this video: https://www.youtube.com/watch?v=aRSVYFrRWeU

cut the sphere in half at the end to get a perfect dome.

Only drawback it limits you to a shape with 16 vertices at the bottom (or more).

Paul
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  • I think you missed the main point in the question :P

    I know how to make a perfect sphere and half sphere, the question was about making a smaller segment of a sphere then half, since the edge loops around a quad-sphere aren't flat.

     – JackHainsworth May 19 '23 at 10:24