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I created this image, then added a plane to indicate where to cut.

enter image description here

I had tried Loop Cut, but that changed the angle of the top section.

How do I cut at the location of the plane? Later I plan to delete the plane and separate the top portion from the bottom portion


--- Allen Simpson procedure:

I select the plane:

enter image description here

I hold shift and select the cylinder:

enter image description here

I have to sweep the mouse over the entire cylinder to select it.

I do not see the Plane with a dark orange outline and the Cylinder with a bright orange outline.


--- Chris procedure: After numerous attempts, did not work for me.


--- With Loop Cut, I can place loop at the correct location and angle.

What command cuts?


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    $\begingroup$ Ever tried the knife tool? $\endgroup$
    – Chris
    Dec 16, 2021 at 16:21
  • $\begingroup$ I tried the knife, but did not get a straight line. I was unable to get out of the knife mode ... right click and left click did not stop the knife mode. Selecting other icons did not work either. $\endgroup$
    – ttom
    Dec 17, 2021 at 12:47
  • $\begingroup$ There used to be a fast way to do this with the plane itself using booltool. This function appears to be broken right now. $\endgroup$ Dec 17, 2021 at 15:53

2 Answers 2

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We can still do this fairly easily you just need to follow a couple of additional steps. Start with the setup in your question and enable the Bool Tool addon from Edit -> Preferences.

enter image description here

First select the Plane, and then hold Shift and select the Cylinder, so that the Plane has a dark orange outline and the Cylinder has the bright orange outline. In other words the Cylinder is your Active Selection and is the object that will be operated upon.

Press Ctrl + Numpad - or use the F3 function search to look for Bool Tool -> Difference. (Two operations will be listed, select the top one.) The result should be:

enter image description here

Now use Shift + D to duplicate both the Cylinder and Plane.

Select the second Plane that you just created (Plane.001), press Tab to go into edit mode. With all four of the plane's vertices selected, press Alt + N and select Flip to flip the plane's normal.

With this step completed, you have reversed the effect of the Difference Boolean on the second Cylinder and should be left with two separated pieces.

enter image description here

You can select both Cylinders and apply the Boolean Modifiers if you desire.

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Afterwards you can delete the planes as they are not useful anymore.

enter image description here

(Bool Tool used to do all of this automatically with the Slice operation, but since... I think the introduction of the Exact Solver this function is broken.)

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  1. select your cylinder in object mode, than press TAB to enter edit mode

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  1. choose viewpoint -> left

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  1. tap on Knife enter image description here

  2. click one time with your knife positioned on the upper right so you get this:

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  1. Tap on C so that in the status bar appear C: cut through (ON)

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  1. now move your mouse left of the cylinder and up or down as you need like this and click:

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  1. Press RETURN

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  1. click here to get back to selection mode :

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now move your view so that you see the cylinder like this

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and change to vertex select mode by clicking here:

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  1. now select two vertices of the top circle ...

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and choose select edge loops:

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now deselect that single vertex by holding CTRL and clicking on it:

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then press x and choose vertices:

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