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I'm new to Blender, and am following this tutorial on how to create a nighttime cityscape:

https://www.youtube.com/watch?v=ygGQaQld3mc&t=140s

At around 02:20, he is able to duplicate a lot of cubes but keep them all as part of one object. I was wondering how you would go about duplicating an object but still keep everything as what would appear to be one cube object. I've tried every hotkey I can find to do with duplicating, but all of them seem to create a brand new object, which isn't what I want. I'm currently running Blender 2.82, so maybe it's an outdated thing? I appreciate any help :)

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What you're trying to accomplish is achieved in Edit Mode. You can enter the dropdown menu in the menus section of your header, or press Tab. Enter Edit Mode, select all the vertices of the cube, then use Shift-D to duplicate.

Ian Hubert's tutorials are for intermediate users. He operates under the assumption that you are already familiar with the basics of Blender. I recommend following a beginner-friendly tutorial series, then continuing where you left off.

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  • $\begingroup$ Thanks! Really big help :) $\endgroup$
    – Haz-ctrl
    May 12 at 19:31
  • $\begingroup$ There is also the CTRL+J shortcut for joining separate objects into 1 singular mesh. Handy for if you wish to stay out of edit-mode and only stay in object-mode. $\endgroup$ May 14 at 21:15
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This is because he is in Edit Mode and he is duplicating geometry (groups of faces, edges, vertices) instead of duplicating an object which represents the geometry plus a set of additional information like local coordinate system, modifiers applied etc.

The IanHubert duplicated geometry, while you duplicated an object. Open both links to see the difference.

This tool simply duplicates the selected elements, without creating any connections with the rest of the mesh (unlike extrude, for example), and places the duplicate at the location of the original.

vs

This will create a visually-identical copy of the selected object(s)[...] This copy is a new object, which shares some data-blocks with the original object (by default, all the materials, textures, and F-curves), but which has copied others, like the mesh, for example

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