I wanted to build a building like the picture and what I did was putting two cubes on top of each other . I want know how this can be made from one cube I mean start from one cube and extrude or ...
- Enter edit mode
- Hit Ctrl-R to make a loop cut across the mesh.
- Repeat in other direction
- Select face and extrude it upwards(E-Z)
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$\begingroup$ @pluke You can use either licecap (@gandalf3's suggestion) or gifcam cegton's suggestion. I used keypose for the shortcuts. $\endgroup$ – GiantCowFilms Feb 9 '15 at 21:22
In Edit Mode select the upper face and snap the cursor to it (press Shift+S-->Cursor to Selected).
Press E to extrude and then S to scale the extrusion. Confirm the operation with Enter.
Extrude once more along z axis. Press E, then Z and confirm the transformation.
Now select the whole extruded element and place it wherever you like, using G and choosing the axis you like.
And here it is.
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2$\begingroup$ you can also extrude faces like that using inset. select the face(s) and "i", then move mouse to change size. $\endgroup$ – Bithur Feb 8 '15 at 15:07
If you do not want to mess with the topology of the lower part of the building, you can build them separately, select both, and join them with Ctrl+J.
Another option is to select the top face and duplicated it with Shift+D.
You will then be able to edit the different parts with complete flexibility, with no fear of ruining your work on the other parts of the building.