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I already have an hemisphere.obj 3D model. But I'm trying to build a half-hemisphere (quarter sphere) model. How can I do that? What is the easiest way to do that?

Generally, is there any easy way to create 1/n of sphere?

enter image description here

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  • \$\begingroup\$ No least you can do is create a custom script that handles the logic for (1/n)th of a sphere, but that is not a very easy thing to do. \$\endgroup\$
    – user82860
    Jun 24, 2016 at 21:12
  • \$\begingroup\$ do you want it in unity or any particular 3d modeling software? \$\endgroup\$ Jun 24, 2016 at 21:22
  • \$\begingroup\$ Possibly Unity, but matter where. Just want to create a mesh somewhere as an .obj file. \$\endgroup\$
    – Mary
    Jun 25, 2016 at 1:01
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    \$\begingroup\$ wiki.unity3d.com/index.php/ProceduralPrimitives#C.23_-_Sphere possibly modified as needed. \$\endgroup\$ Jun 25, 2016 at 2:49
  • \$\begingroup\$ That's for sphere only. How shall I modify it to get semisphere or say quarter sphere? \$\endgroup\$
    – Mary
    Jun 25, 2016 at 4:23

2 Answers 2

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If you just need it once, I'd suggest you pick up some basic knowledge of a modelling tool. It's very easy to do in Blender:

  1. Delete the cube that you start with by pressing DEL.
  2. Create an UV Sphere primitive. This will create a sphere with radius 1.0
    (Note: In the lower left corner you can edit the properties (segment/ring count, radius) of the sphere after creation.) Blender: Create UV Sphere

  3. Change view to Front and zoom in using the mouse wheel: Blender: Change view

  4. Press TAB to enter edit mode. Press a to clear the selection (which is orange).

  5. Change the display mode to wireframe (so we can select stuff that would be hidden behind the front surface): Blender: Edit wireframe

  6. Press b and you'll get a selection rectangle. Select all vertices you want to remove: Blender: Select and delete vertices

  7. Press DEL and select Vertices.

  8. For a quarter-sphere: Change view to Top like in step 3 and repeat steps 6 and 7.

  9. Once you're done editing, hit TAB to exit edit mode.

  10. Change shading to Smooth so you get interpolated normals: Blender: Set smooth shading

  11. Select File -> Export -> Wavefront (.obj).

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    \$\begingroup\$ Awesome answer for a beginner to Blender! \$\endgroup\$
    – Mary
    Jun 27, 2016 at 17:18
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Maya experience here. Use a plane or cube to insect with your object. Use boolean operation like UNION,difference, etc to get this.

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