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Trying an old Blender Guru tutorial 'how to create a high-rise building' I came upon a change I needed to make to the length of the original wall mesh. After setting the length of original mesh I applied a mirror modifier, array modifier to get four walls (offset is an empty that i rotate) and an second array for getting the 14 floors of the building. However the two left windows of the original mesh were to small (rectangular and not square). I tried to change the length by grabbing the right side of the mesh (selected). The thing is now the walls are overlapping instead of getting a larger building as a result of expanding walls. What are possible solutions?

My blend file can be found at: PasteAll

enter image description here

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  • $\begingroup$ @Ray-Mairlot: Thank you for the answer. Seemingly easy problems have simple solutions. Sometimes I think everything is automatic when a simple action by myself does also the job. Following question is how do I verify both sides of the wall are merged? $\endgroup$
    – fonz55
    Commented Jun 15, 2016 at 22:04
  • $\begingroup$ @root: Sorry I wasn't clear that I hadn't applied the modifiers already. In the tutorial they are applied as one of the last steps. During other tutorials I learned a lot about undo history. Therefor I have changed the default setting to a higher number so I can go way back. Thank you both. $\endgroup$
    – fonz55
    Commented Jun 15, 2016 at 22:08

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The mirror modifier works by taking into account where the geometry is in relation to the object origin (the orange dot at the centre of the model). The array modifier that controls where the walls are depends on the chosen Empty, which is at the same place as the object origin.

All you have to do is select all the geometry in edit mode and move it on the 'Y' axis (green), away from the object origin (by pressing G, Y) and both the Mirror modifier and the Array modifier will update.

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The array modifier creates phantom geometry that has a relation to your original mesh, when you apply the modifier you loose that connection and the edits you do to your original mesh won't propagate to the other similar parts.
if you applied the modifiers recently and you still have your blend file open and didn't made many changes simply undo changes until you get back to the point before you applied the modifiers, you can use F3 to see your undo history and undo many steps at once.

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