I've had difficulty trying to cut a cube in half. I tried the knife tool at first, but that didn't work. I also tried using the loop cut too, but it just extrudes. I'd like to be able break it off into two entirely separate objects.

up vote 7 down vote accepted

It is fairly simple, but it does utilize the obscure Rip tool (V). Here are the steps:

  1. Tab into Edit Mode.
  2. Key Ctrl + R and move the cursor around until the pink suggested loop cut is dividing the cube in half in the manner that you want it to (X, Y, or Z).
  3. LMB LMB, then immediately RMB RMB to add the loop to the actual mesh. Make sure it remains selected; nothing else should be selected.
  4. Key V to rip the vertices (opposite of Alt + M / W > Remove Doubles) and once again immediately RMB RMB. You should now have two identical copies of the loop cut that you previously added in the same place and one of them selected.
  5. Key Ctrl + L to select the rest of one half of the cube.
  6. Key P to open the Separate menu and select By Selection.
  7. Tab out of Edit Mode. You should now have two identical halves of a cube.

The Procedure:

enter image description here

Edit (Optional Steps 6.5, 8, 9, and 10):

  6.5. Use Alt + RMB RMB to select the loop cut on the remaining half of the cube and key F to create a face.

  8. Select the other cuboid half and Tab into Edit Mode.

  9. Use Alt + RMB RMB to select the loop cut on the remaining half of the cube and key F to create a face.

  10. Tab out of Edit Mode.

Steps 6.5-10:

enter image description here

  • You actually don't need to use the Rib tool, seperating into different objects will automatically split the edges. – Ezra Nov 27 '16 at 18:16
  • @Ezra Good idea! – Shady Puck Nov 27 '16 at 18:45

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