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Please go light on me, this is my first time posting and I am just starting Blender this week.

My issue is, is that I am trying to cut a hole in a cylinder. It's an archway that acts as a walkway into the cylinder. However, I need to cut this archway on multiple sides and at various heights. Think colosseum, just smaller and less sophisticated.

I have used the following youtube tutorial up to deleting faces. (Note: To be more clear, I have not deleted any faces yet) https://www.youtube.com/watch?v=Ci1jBOm_5NY

This is what it looks like so far: enter image description here

every face that is similar to the one with the arch I need to have an arch on to cut the hole. I hope I have made sense. Thanks in advance.

SimpleLizard
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    Don't focus on that you have to cut. I would create one entrance, then repeat that using the array modifier (use and empty that you rotate with) to duplicate it in a circle. Once you have a circle, duplicate it upwards. – Gunslinger Jun 13 '21 at 14:50
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    do you have an image of the object you want to achieve? – moonboots Jun 13 '21 at 15:04

1 Answers1

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suppose you have this object, you want to cut:

enter image description here

  1. Add Mesh -> Circle

  2. Then hit R -> X -> 90 and move on y axis like so:

enter image description here

  1. Tab for edit mode, go in side view

enter image description here

  1. select bottom half of circle and hit X -> vertices

enter image description here

enter image description here

  1. select the bottom 2 vertices

  2. press E -> Z -> mouse down as you need -> F

enter image description here

  1. Tab

  2. move this guy up as you need

  3. select this guy, then your object to cut

enter image description here

  1. tab -> A

  2. F3 -> Knife project

enter image description here

  1. choose cut through in the left bottom corner

  2. choose face select

  3. choose x-ray

enter image description here

  1. choose all faces which are inside your cut loop

  2. result:

enter image description here

...but...for each face, this is too much work. So you should try it like Gunslinger said and make one face, cut it out and then use array modifier.

So the better way would be:

  1. add cube

  2. cut an arch hole in the cube like i described above

enter image description here

  1. delete "inner faces" of the arch

enter image description here

  1. move the result on y axis in edit mode like this

enter image description here

important: notice, that the center point is still at 0,0 (z value does not matter)

  1. add empty

enter image description here

  1. apply rotation to your cube/arch

  2. add array modifier to cube/arch like this:

enter image description here

  1. add some rotation z value in empty as you need and adapt count in array as you need ( i used 30 degrees and count 12 )

enter image description here

...and of course there are more possibilies ... ;)

you could build an arch like this (explanation as above):

enter image description here

move the arch inside your object

enter image description here

and then add array modifier like above to arch with empty ...

so you got this:

enter image description here

then add boolean modifier to your object/cylinder and set viewport visibility to bounds for your arch

enter image description here

and you will get

enter image description here

then add another cylinder like this

enter image description here

and add second boolean on your object for that cylinder and set viewport visibility of this cylinder to bounds to get this

enter image description here

enter image description here

Chris
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