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Also, are there any techniques to do these kind of shapes in Blender?

Edit: Second part of this Q was removed. It has a new thread here

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    $\begingroup$ I couldn't picture what the arc you build has to do with the roof in the images above. Can you clarify? $\endgroup$
    – Carlo
    Jun 27, 2020 at 14:37
  • $\begingroup$ no both are totally different images! In my model, I generally have to do such kind of shapes and I have trouble doing them hence put it up for reference. I am searching for an easy method to do it. only if the edges could be magically turned into curves so i could dip them, my life would be so much better $\endgroup$ Jun 27, 2020 at 14:47
  • $\begingroup$ Blender has build in addons like Archipack and Archimesh and also Extra Curve addon can generate some arch type of shape. It really depence what specificaly you need to achieve. I'm not sure what do you mean edges to curves. You can Convert Mesh to Curve, but it depence what exactly you need to result with. If answers doesnt covers your Q edit your Q with more mockups. $\endgroup$
    – vklidu
    Jun 27, 2020 at 17:22

2 Answers 2

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You should use the Array modifier with an Object Offset:

  • Create a 8 vertex circle.

enter image description here

  • Only keep 1/8, create an empty at the same point as its origin.

enter image description here

  • Give your circle an Array modifier, Count > 8, deactivate Relative Offset, activate Object Offset, choose the empty as object, rotate the empty 45° on the Z axis.

enter image description here

  • Model the object.

enter image description here

  • Extrude it down, flatten the bottom with SZ0.

enter image description here

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  • $\begingroup$ Since others started to react to my oftopic comment here, I asked them to delete comments and move to chat to keep your answer clean. Thanks :) $\endgroup$
    – vklidu
    Jun 28, 2020 at 16:07
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I would say possible with three modifiers.

  • create a segment
    (circle 8 sides, fill triangulate, keep 1/8)
  • add Solidify modifier (to get hight)
  • add Sphere
  • select segment add Boolean modifier > Difference (object Sphere)
  • add Empty, rotate 45°on Z axis
  • select segment add Array modifier > Count 8 / Object offset ON - Empty

enter image description here enter image description here

Tips:

  • by moving and scaling Sphere you can shape curvature of segment
  • to get nice topology following roof shape, direct top of sphere to center of segment

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    $\begingroup$ vklidu, our responses are slightly different, it would be worth if you gave a more detailed answer $\endgroup$
    – moonboots
    Jun 27, 2020 at 15:39
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    $\begingroup$ @moonboots ok you got me :) I was ready to delete it, since your version was even better with topo, at the end I compensate this handicap a bit with Sphere rotation. BTW still one of us could spent time with another Q :) Cheers $\endgroup$
    – vklidu
    Jun 27, 2020 at 16:27

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