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

  • \$\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\$ – A---B Jun 24 '16 at 21:12
  • \$\begingroup\$ do you want it in unity or any particular 3d modeling software? \$\endgroup\$ – Sourav Paul Roman Jun 24 '16 at 21:22
  • \$\begingroup\$ Possibly Unity, but matter where. Just want to create a mesh somewhere as an .obj file. \$\endgroup\$ – Tina J Jun 25 '16 at 1:01
  • 1
    \$\begingroup\$ wiki.unity3d.com/index.php/ProceduralPrimitives#C.23_-_Sphere possibly modified as needed. \$\endgroup\$ – Sourav Paul Roman Jun 25 '16 at 2:49
  • \$\begingroup\$ That's for sphere only. How shall I modify it to get semisphere or say quarter sphere? \$\endgroup\$ – Tina J Jun 25 '16 at 4:23

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).

  • 2
    \$\begingroup\$ Awesome answer for a beginner to Blender! \$\endgroup\$ – Tina J Jun 27 '16 at 17:18

Maya experience here. Use a plane or cube to insect with your object. Use boolean operation like UNION,difference, etc to get this.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.