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hello, so I've build this house and I want to add a round window below the roof. Kind of reached a bottleneck here and don't know what to do, youtube tutorials aren't very helpful.. What should I do in order to accomplish that red circle into my wall. It can't be added with the circle tool because I want to use "E"-Key inward to give it a window effect, so it must be drawn onto the wall. Thx for replies!

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There are a few approaches to this. I'm going to describe the non-destructive Boolean workflow.

  • Create a cylinder matching the radius of your circle and rotate it so it is perpendicular to the wall.
  • Position it so that is passes through the wall where you want the circle.
  • Go to its Object properties and under Viewport Display change "Display As" to wire.

Object Data Properties showing Display as Dropdown about to select wire

You have just created what is called a cutter. Next the cutter is applied to create the hole:

  • In object mode, select the object that has your wall in it and add a Boolean modifier
  • Make sure its type is set to Difference
  • Select the cylinder as the Object (I named my cylinder "cutter")
  • You may have to change the Solver to Fast

Boolean modifier set to difference

You should end up with something that looks like this:

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another way to do this:

  1. if you have subdivided your wall, select 9 vertices like this:

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  1. mesh -> transform to sphere or Shift - Alt-S 1

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  1. do the same on the other side and select both "circles"

then

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result:

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Hint: the more subdivisions you had before, the rounder the hole will be.

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Select the face where you want to have your hole:

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subdivide it

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Mesh -> Transform to Sphere -> Drag your mouse

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Correct with S -> Y

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Now tap your "E" and you got:

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