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I'm trying to replicate this logo to 3d space but I'm not able to make the last green portion.enter image description here

Here is an image of the intended result : enter image description here

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You can get close with proportional editing.

  1. Add a UV sphere and rotate it 45° in edit mode
  2. Grab the top point and align it to the top right corner
  3. Check ✓ Proportional Editing > Sharp, adjust Falloff so it fits

enter image description here

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    $\begingroup$ You're quick off the mark, today, JM :D $\endgroup$ – Robin Betts Jan 22 at 22:13
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    $\begingroup$ Hahah, I should probably get a life. But not today :) $\endgroup$ – Jachym Michal Jan 22 at 22:27
  • $\begingroup$ Thank you for the answer, appreciate it. $\endgroup$ – loboly_19 Jan 22 at 22:55
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Here's another way.. (Pivot set to '3D Cursor', Orientation 'Local'):

  1. Rotate your ref by 45, and align a sphere to it, poles up and down. Put the Cursor at its center. (I did mine in Edit mode, so I had to reposition the origin of the sphere to the cursor:

enter image description here

  1. GZ (Local) extend the pole vertex to the reference's point. You may need to rotate the geometry to get a match all round.

enter image description here

  1. Alt - select a few edge loops, and CtrlX dissolve them

enter image description here

  1. After CtrlShiftB bevelling the pole vertex a fraction, CtrlR replace the loops.

enter image description here

You may need to do a tiny bit of vertex-smoothing, edge-sliding..

enter image description here

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  • $\begingroup$ Thank you for the detailed answer, appreciate it. $\endgroup$ – loboly_19 Jan 22 at 22:56
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Here is another solution. It's more "mathematically precise" but requires a few more steps.

  1. Start with a plane.

  2. Bevel all but 1 corner (cmd+shift+B).

    • Tap V to affect vertices instead of edges if it's not already.
    • Tap C to use clamping so the size of each bevel uses exactly half of the edge length.
    • Make sure you use an EVEN number of segments (scroll wheel or S+mouse to change) so there is a single vertex at the opposite end of the non-beveled vertex.

Bevel all but one vertex

  1. There will be 2 overlapping vertices. Use merge by distance to remove them.

Merge vertices

  1. Remove vertices using dissolve until the shape is half the shape it was before.

Dissolve vertices

  1. Drop an empty and rotate it by 45deg on the Z-axis.

Place an empty

  1. Apply a Screw modifier to the plane.
    • Set the axis to Y or X (depending on which vertex wasn't beveled)
    • Set Axis Object to the Empty.
    • Make sure you check the "Merge" option to get a clean result.

Apply screw modifier

Optional: Apply the Screw modifier to permanently set the solid.

Unedited video version: https://youtu.be/tOCXQz4tehE

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  • $\begingroup$ Neat. Could you not just delete the pole-to-pole straight edge, (and the internal face) before screwing? $\endgroup$ – Robin Betts Jan 26 at 22:19
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    $\begingroup$ @RobinBetts you could, but you don't need to. The edge is automatically deleted when the screw happens. $\endgroup$ – PJM Design Jan 27 at 3:16
  • $\begingroup$ ..thanks! I never knew that. $\endgroup$ – Robin Betts Jan 27 at 7:04

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